CN116519442A - Annular shearing component with circular structural surface and annular shearing test device - Google Patents

Abstract

The invention provides a circular structural surface circumferential shear component and a circumferential shear test device, wherein the circumferential shear component is movable and detachable and comprises a chassis consisting of a transmission chassis, a rotary chassis and a fixed chassis, wherein the transmission chassis, the rotary chassis and the fixed chassis are coaxially arranged from inside to outside; the transmission chassis is provided with a transmission shaft connecting hole, is fixed on the rotary chassis, and is arranged on the fixed chassis and can rotate relative to the fixed chassis; the first shearing box is formed by taking the transmission chassis as an internal limiting part and a first movable element and is fixedly arranged on the rotary chassis; a second shear box which is attached to the periphery of the first shear box and is formed by installing a second movable element on the fixed chassis; the first shear box can rotate relative to the second shear box under the drive of an external transmission motor, so that circumferential shear is generated. The invention can be applied to circular structural surface circumferential shear mechanical response test, and the shape flexibility of the shear box is high, so that the invention can be applied to samples to be tested with different sizes.

Description

Circular structural surface hoop shear component and hoop shear test device

technical field

The present invention relates to the technical field of hoop shear test devices, and relates to a hoop shear component and a hoop shear test device, in particular to a circular structural surface hoop shear component and a hoop shear test device, especially The invention relates to a circular shearing component and a circular shearing test device, which are applicable to the circular contact interface shear characteristic test of different engineering substrates, and the shearing surface is a circular structural surface, and the shearing direction is the circumferential direction of the contact interface.

Background technique

Today, with the rapid development of science and technology, interface problems have become ubiquitous no matter from the macro or micro perspective, and have become one of the technical problems that must be overcome by scientific research and engineering technicians. From a macro perspective, various materials and their joints, such as the contact interface between pipes and soil, the contact interface between pile foundation and soil, the contact interface between various column structures and other materials, and the coating interface of thin film coating materials , the mechanical interaction interface between transmission parts, the bonding interface between functional devices and load-bearing components, and the interlayer of composite material laminates, etc., are very important to the load-bearing capacity, efficiency, service life, and reliability of the material or the overall structure. Influence; from the microscopic point of view, the mechanical behavior of the interface between fiber and matrix material, grain interface, particle reinforcement and matrix interface, intervening object and matrix interface, etc., has an impact on the performance design and development of advanced materials and their structural life. Accurate evaluation and so on are of great significance.

Since the material contact surface is a weak structural layer relative to the material matrix, the damage and destruction of most components occur or originate from the interface, and the energy loss in the transmission system is mainly caused by friction at the interface. With the rapid development of science and technology, the industrial application range of various functional materials, composite materials and other advanced materials has been continuously expanded, and the mechanical properties of the contact interface between different substrates have attracted more and more attention and attention. Aiming at the macro-shear mechanical properties of the material interface, scholars at home and abroad have invented many shearing methods and test devices, but most of these shear test devices are used to simplify the material model and treat the material interface as a plane structure for direct shearing.

For example: patent document CN110044726A discloses a ring shear instrument test system suitable for soil-rock contact surface, which can simulate the progressive failure behavior of soil slide body on rock slide bed along the structural surface, including upper shear box and lower shear box , the rotating platform is detachably connected to the lower shear box, and the upper shear box is equipped with a pore water pressure sensor. Its disclosed time-shearing part and ring shearing instrument, what it can realize is not the circumferential shearing along the circular structure surface of the material, but the shearing of the horizontal contact surface of the upper and lower shearing boxes, in fact It is also a direct shearing of a planar structure. Patent document CN110987660A discloses a ring shear test device, and its disclosed shearing parts include a first shearing box and a second shearing box. When shearing, the first shearing box is fixed and the second shearing box rotates. In the circular rotating shear soil sample, the shear deformation of the horizontal plane changes with the radius, which can simulate the strength relationship of the contact surface under different loads and deformation conditions, and can simultaneously obtain the relationship between shear displacement-shear stress and shear displacement-normal displacement relation. It also cannot achieve circumferential shearing of circular structural surfaces.

In actual engineering, the contact interface between structures such as pipes, piles, columns and other materials is usually a circular structural surface; in some studies on circular structural surfaces, due to the constraints of loading methods, the circular structural surface However, the circular structural surface of materials is often affected by both longitudinal and circumferential effects in actual engineering, and it is difficult to reflect the true mechanical properties of the interface only from the longitudinal perspective. Therefore, it is of great engineering significance to develop new test devices and test methods for the circumferential shear characteristics of circular structural surfaces. Therefore, there is an urgent need to develop a hoop shear component and hoop shear test device suitable for a circular structural surface with a shear surface and a shear direction in the circumferential direction of the contact interface.

Contents of the invention

In view of the above-mentioned defects in the prior art, the technical problem to be solved in the present invention is to provide a circular structural surface hoop shear component and a hoop shear test device, which are applied to the circular structural surface hoop shear mechanical response Experiments to accommodate a simulation study of hoop shear in circular structural faces. The shape of the hoop shearing part has greater flexibility, and can accurately obtain the mechanical parameters of the material and the mechanical parameters of the bond-slip performance of the material interface, which is helpful for the hoop shearing of circular structural surfaces such as pipes, pile foundations, and columns. The study of cutting mechanism.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

Firstly, the present invention provides a circular structural surface hoop shearing part, which is a movable and detachable hoop shearing part, including a chassis, which is mainly composed of coaxial Composed of transmission chassis, rotating chassis and fixed chassis arranged in the outer ring direction;

The shaft center of the transmission chassis is provided with a transmission shaft connection hole for setting the transmission shaft and connecting with the external drive mechanism; the transmission chassis is fixed on the rotating chassis, and the rotating chassis is set on the fixed chassis and can rotate relative to the fixed chassis;

The upper end surfaces of the rotating chassis and the fixed chassis are at the same level, and the upper end surface of the transmission chassis is higher than the upper end surfaces of the rotating chassis and the fixed chassis by a preset distance;

It also includes a first shear box composed of the transmission chassis as the internal limiting part and the first movable element installed and fixed on the rotating chassis; The second shear box formed above; the first shear box has a first accommodation groove, the second shear box has a second accommodation groove, and the notch of the second accommodation groove communicates with the notch of the first accommodation groove to forming a holding chamber for holding the sample to be tested;

Driven by an external transmission motor, the first shear box can rotate relative to the second shear box to generate circumferential shear. Specifically, when working, the rotating chassis is used as the bottom part of the first shearing box, and the transmission chassis rotates under the drive of the external drive mechanism to drive the rotating chassis to rotate, and the second shearing box is fixed, so that the first shearing box is relatively The second shear cell rotates, and the sample in the cell generates hoop shear.

In one of the schemes, the movable and detachable circumferential shearing part is a fan-shaped sample shearing part, which is suitable for a fan-shaped shear sample;

The first movable element that forms the first shear box includes two first fixed stops and a fan-shaped first fixed top plate; the transmission chassis is used as an internal limiter, and the two first fixed stops are arranged at intervals as two The side limit part, the first fixed top plate is used as the upper limit part, the first fixed top plate is fixedly connected with two first fixed stops arranged at intervals and fixedly installed on the rotating chassis, and the first shearing box is formed on the rotating chassis , forming a fan-shaped first accommodation groove;

The second movable element that forms the second shear box includes two second fixed stops and a second fixed top plate, and the two second fixed stops are arranged at intervals and fixed on the fixed chassis as two-side limiting parts. The second fixed top plate is used as the upper limit part and is set close to the first fixed top plate and is fixedly connected with two second fixed stoppers arranged at intervals and fixedly installed on the fixed chassis, forming a second shear box on the fixed chassis to form a fan An annular second storage tank; the notch of the second storage tank communicates with the slot of the first storage tank to form a fan-shaped storage cavity for containing the sample to be tested.

further,

The number of the first shearing box and the second shearing box is at least one. When the number of the first shearing box and the corresponding second shearing box is multiple, multiple sets of The first shear box composed of two spaced apart first fixed stops and the first fixed top plate is fixedly installed on the fixed chassis correspondingly with multiple sets of two spaced apart second fixed stops formed by the second fixed top plate. In the second shear box, the plurality of first shear boxes and the corresponding second shear boxes are arranged to form a plurality of accommodation cavities, which can realize circumferential shearing of a plurality of sector-shaped samples.

further,

The thickness, radius, corresponding center angle size and position of the first fixed block and the first fixed top plate forming the first shear box and the second fixed block and the second fixed top plate of the second shear box are determined according to the Adjust the thickness, radius, corresponding central angle, and position of the cut sample to adapt to samples of different thickness, radius, central angle, and position.

further,

The first fixed stop and the second fixed stop on the same side are located in the same radial direction and the inner and outer end faces and upper end faces of the stop are flush; the first fixed top plate covers the two first fixed blocks arranged at intervals. On the fixed block; the second fixed top plate is covered and arranged on the two second fixed blocks arranged at intervals to form a regular box body.

In another solution, the movable and detachable circumferential shearing part is a ring-shaped sample shearing part, which is suitable for ring-shaped shearing samples;

The first movable element constituting the first shearing box only includes an annular first fixed top plate, the transmission chassis is used as an internal stopper, the first fixed top plate is used as an upper stopper, and the inner side of the first fixed top plate is close to the transmission The outer side of the chassis is fixedly installed at a preset height above the rotating chassis, and a first shear box is formed on the rotating chassis to form a ring-shaped first receiving groove;

The second movable element constituting the second shear box only includes an annular second fixed top plate, the second fixed top plate is used as the upper stop, and its inner side is set close to the outer side of the first fixed top plate, and is fixedly installed at a distance from The position of the preset height above the fixed chassis forms a second shear box on the fixed chassis to form an annular second accommodation groove; the notch of the second accommodation groove is communicated with the notch of the first accommodation groove to form an accommodating Ring chamber for test specimens.

further,

The preset height between the first fixed top plate and the installation above the rotating chassis, and the preset height between the second fixed top plate and the installation above the fixed chassis are adjusted according to the thickness of the ring sample, so as to adapt to ring samples of different thicknesses.

further,

The preset height at which the first fixed top board is installed above the rotating chassis is equal to the preset height at which the second fixed top board is installed at a distance above the fixed chassis.

In the above scheme, for the fan ring shearing part, the first shear box and the second shear box in the ring shearing part, in order to facilitate the observation of the shear failure process, the first fixed top plate and the second shearing box in the fan ring shearing part Two fixed top plates, the first fixed top plate and the second fixed top plate in the annular shearing part can be separated by a certain distance at the position of the shearing circular structure surface; for samples with higher strength, the upper fixed top plate can be removed.

The present invention also provides a hoop shearing test device, which includes the above-mentioned hoop shearing component and a driving mechanism. The transmission connection between the transmission shaft and the transmission chassis is realized, and the drive mechanism drives the transmission shaft to drive the transmission chassis to rotate, so that the first shear box rotates relative to the second shear box to generate circumferential shear; the transmission shaft is provided with a torque sensor, which is used to Torque generated when measuring hoop shear.

further,

The drive mechanism exerts a hoop shearing force with a fixed angular velocity or a fixed torque.

The present invention can realize following technical effect:

In the circumferential shearing part provided by the present invention, the first shearing box and the second shearing box are installed by a plurality of detachable and size-changing movable elements through fixing bolts, and can be composed of the first shearing box, the second shearing box, etc. The thickness, radius, corresponding central angle, and installation position of the second shearing box’s movable elements form shearing boxes of different specifications, so as to achieve circumferential shearing of samples of different materials, thicknesses, radii, and corresponding central angles. . Therefore, the present invention can study the influence of factors such as thickness, radius, central angle, material, load action size and position, and shear surface radius on the circumferential shear mechanical properties of the circular structural surface.

The shearing part of the present invention can be connected with an external driving mechanism, and the driving mechanism can apply a rotational torque so that the force is always perpendicular to the normal direction of the interface, thereby simplifying the circumferential shearing of the circular structural surface into a plane direct shearing Cutting can realize the research on the circumferential shear mechanical properties of circular structural surfaces, and solve the problem of difficult circumferential shear loading of circular structural surfaces.

The hoop shear component and test device provided by the invention can hoop shear a single material, and its function is similar to that of direct shear test and conventional hoop shear test, and can obtain relevant mechanical properties of materials. At the same time, unlike traditional shearing, since the shearing surface is circular, it is more in line with torsion engineering structures, such as pipes, piles, columns and other structures. Moreover, the hoop shear test device provided by the present invention can perform hoop shear on a sample whose interface between two materials is a circular structural surface, and can deeply explore the bond-slip performance of the material interface along the hoop direction. Therefore, the test device of the present invention can obtain mechanical parameters such as internal friction angle and cohesion force of a single material, and can also obtain shear mechanical properties of a circular structural surface for a sample combined with two materials. It can provide a reliable reference basis for the research on the circumferential force mechanism of circular structural surfaces such as pipes, pile foundations, columns and other materials, technical construction standards, daily maintenance, repair and repair effect evaluation.

The hoop shear test device provided by the invention can be applied to two kinds of shear samples, namely sector-shaped and annular. For the fan-shaped sample to be tested with a small central angle, multiple first and second fixed stops, first and second fixed top plates can be installed at the same time to form multiple first shear boxes and second shear boxes. , realize the circumferential shearing of multiple fan-ring samples, and improve the test efficiency.

For the accommodation cavity formed by the first and second shear cells, the sample does not need to fill the cavity in the radial direction, and only needs to make the shear surface be located on the contact surface of the shear cell. Since the sample is cut along the circular structural surface, the test It will not loosen in the radial direction.

In summary, the circular structural surface hoop shear component and test device provided by the present invention can be applied to circular structural surface hoop shear mechanical response tests, and the shape of the shear box is flexible, and can be applied to different sizes The sample to be tested can accurately obtain the mechanical parameters of the material and the mechanical parameters of the bond-slip performance of the material interface, which is helpful for the hoop shear mechanics mechanism of circular structural surfaces such as pipes, pile foundations, and columns, as well as different hoop loads Research on the mechanism of lower interface strength.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of the circular shearing part of the fan-shaped sample in Example 1 of the present invention.

Fig. 2 is a schematic structural view of a ring-shaped sample hoop shearing member according to Example 2 of the present invention.

Fig. 3 is a schematic diagram of a fan-shaped sample in Example 1 of the present invention.

Fig. 4 is a schematic diagram of a ring sample in Example 2 of the present invention.

Fig. 5 is a schematic diagram of the installation structure of the torque sensor of the hoop shear test device in Example 3 of the present invention.

Fig. 6 is a schematic structural diagram of a first fixing member according to an embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a second fixing member according to an embodiment of the present invention.

The accompanying figures of the present invention are described as follows:

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In addition, in the present invention, descriptions such as "first", "second" and so on are used for description purposes only, and should not be understood as indicating or implying their relative importance or implicitly indicating the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise specified and limited, the terms "connection" and "fixation" should be understood in a broad sense, for example, "fixation" can be a fixed connection, a detachable connection, or an integral body; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal communication between two elements or an interaction relationship between two elements, unless otherwise clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In addition, the technical solutions of the various embodiments of the present invention can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered as a combination of technical solutions. Does not exist, nor is it within the scope of protection required by the present invention.

Example 1

As shown in Figures 1 and 3, this embodiment provides a circular structural surface circumferential shearing component, which is a movable and detachable sample shearing component, including a chassis, and the chassis is mainly composed of a coaxial center from the inside. It consists of a transmission chassis 1, a rotating chassis 4 and a fixed chassis 7 arranged in the outer ring direction;

The shaft center position of the transmission chassis 1 is provided with a transmission shaft connection hole, which is used to set the transmission shaft and connect with the external drive mechanism; the transmission chassis 1 is fixed on the rotating chassis 4, and the rotating chassis 4 is arranged on the fixed chassis 7 and can be fixed relative to The chassis 7 rotates;

The upper end surfaces of the rotating chassis 4 and the fixed chassis 7 are in the same horizontal plane, and the upper end surface of the transmission chassis 1 is higher than the preset distance between the upper end surfaces of the rotating chassis 4 and the fixed chassis 7;

It also includes a first shearing box that uses the transmission chassis 1 as an internal limiter and the first movable element is installed and fixed on the rotating chassis 4; The second shear box that forms on the fixed chassis 7; The first shear box has the first accommodation groove, and the second shear box has the second accommodation groove, and the notch of the second accommodation groove is connected with the groove of the first accommodation groove The openings are connected to form a chamber for containing the sample to be tested; driven by an external drive motor, the first shear box can rotate relative to the second shear box to generate hoop shearing.

During work, the rotating chassis 4 is used as the bottom part of the first shearing box, and the transmission chassis 1 rotates under the drive of the external drive mechanism and drives the rotating chassis 4 to rotate, and the second shearing box is fixed, so that the first shearing box is relatively As the second shear cell rotates, the sample in the cell generates hoop shear.

As a preferred embodiment, the movable and detachable annular shearing part in this embodiment is a fan-shaped sample shearing part, which is suitable for a fan-shaped shear sample.

The first movable element that forms the first shear box includes two first fixed stops 2 and a fan-shaped first fixed top plate 3; the transmission chassis 1 is used as an internal limiter, and the two first fixed stops 2 are spaced apart. It is set as both side limiting parts, and the sector-shaped first fixed top plate 3 is used as the upper position-limiting component. The sector-shaped first fixed top plate 3 is fixedly connected with the two first fixed stops 2 arranged at intervals and is fixedly installed on the rotating chassis 4. , form the first shear box on the rotating chassis 4, forming the first housing groove of fan ring;

The second movable element that forms the second shear box includes two second fixed blocks 6 and a fan-shaped second fixed top plate 8, and the two second fixed blocks 6 are arranged at intervals and fixed on the On the fixed chassis 7, the fan-shaped second fixed top plate 8 is used as an upper limit part and is arranged close to the fan-shaped first fixed top plate 3 and is fixedly connected with two second fixed stops 6 arranged at intervals and fixedly installed on the fixed chassis 7 , form a second shear box on the fixed chassis 7 to form a sector-shaped second holding groove; the notch of the second containing groove communicates with the notch of the first containing groove to form a sector-shaped ring containing the sample to be tested of the accommodation chamber.

As a preferred embodiment, the number of the first shear box and the second shear box is at least one, and when the number of the first shear box and the corresponding second shear box is multiple, the rotating chassis 4 There are multiple groups of first shearing boxes composed of two first fixed stoppers 2 arranged at intervals and the fan-shaped first fixed top plate 3 are fixedly installed, and multiple groups of first shear boxes arranged at two intervals are fixedly installed on the fixed chassis 7 correspondingly. The second shearing box formed by two fixed stops 6 and the second fixed top plate 8 of the fan ring, a plurality of first shearing boxes and corresponding second shearing boxes are provided to form a plurality of accommodating cavities, which can realize the operation of multiple fans. Circumferential shearing of ring specimens.

As a preferred embodiment, the first fixed stopper 2 and the second fixed stopper 6 on the same side are in the same radial direction and the inner and outer end faces and upper end faces of the stoppers are flush; the fan-shaped first fixed top plate 3 The two first fixed blocks 2 arranged at intervals are covered; the sector-shaped second fixed top plate 8 is arranged on the two second fixed blocks 6 arranged at intervals to form a regular box body.

The first fixed stopper 2 and the second fixed stopper 6 are provided with bolt holes in the radial direction, which can ensure the firmness of the stoppers and the function of limiting the sample.

Form the first fixed block 2 of the first shear box, the first fixed top plate 3 of the fan ring, and the second fixed stop 6 of the second shear box, the second fixed top plate 8 of the fan ring. Factors such as the size and position of the central angle can be adjusted according to the thickness, radius, and corresponding central angle size and position of the sheared sample, so as to adapt to samples with different thicknesses, radii, central angles, and positions. Since the structural components of the first and second shear boxes are fixed by fixing bolts, they can be removed and replaced, so the thickness, radius, corresponding central angle, and installation position of the sample can be adjusted according to requirements. For samples with small central angles, multiple first fixed stops 2, first fixed top plate 3 of fan ring, second fixed stop 6, and second fixed top plate 8 of fan ring can be installed at the same time, and multiple sample rings can be realized. Directional shearing improves test efficiency.

When in use, a pressure sensor is provided on the contact surface between the shear sample and the first fixed block 2 and the second fixed block 6, and the pressure sensor should be as close to the shear surface as possible. It is used for secondary confirmation of the data measured by the torque sensor.

Example 2

As shown in Figures 2 and 4, this embodiment provides another circular structural surface hoop shearing part, which is different from the hoop shearing part provided in Embodiment 1 in that the movable and detachable hoop shearing part in this embodiment The shearing part is a ring-shaped sample shearing part, which is suitable for a ring-shaped shear sample.

As a preferred embodiment, in the hoop shearing part of this embodiment, the first movable element constituting the first shearing box only includes an annular first fixed top plate 16, the transmission chassis 1 is used as an internal stopper, and the annular first fixed top plate 16 is used as an internal stopper. A fixed top plate 16 is used as the upper limit part. The inner side of the annular first fixed top plate 16 is close to the outside of the transmission chassis 1 and is fixedly installed at a preset height above the rotating chassis 4 to form the first shear on the rotating chassis 4. a box forming an annular first receiving groove;

The second movable element that forms the second shear box only includes an annular second fixed top plate 17, with the annular second fixed top plate 17 as the upper limit, and its inner side is arranged close to the outer side of the annular first fixed top plate 16, and It is fixedly installed at a preset height above the fixed chassis 7, and the second shear box is formed on the fixed chassis 7 to form an annular second accommodation groove; the notch of the second accommodation groove is connected with the groove of the first accommodation groove The ports are connected to form an annular chamber for containing the sample to be tested.

The preset height of the ring-shaped first fixed top plate 16 from the installation above the rotating chassis 4, and the preset height of the ring-shaped second fixed top plate 17 from the installation above the fixed chassis 7 are adjusted according to the thickness of the ring sample to adapt to ring samples of different thicknesses .

The preset height installed above the rotating chassis 4 from the annular first fixed top plate 16 is equal to the preset height installed above the fixed chassis 7 from the annular second fixed top plate 17 .

Example 3

As shown in Figures 1-7, this embodiment provides a circular structural surface hoop shear test device, including: the hoop shear component provided in embodiment 1 or embodiment 2 and the drive mechanism, which is a servo motor 14 , to apply torsional power through the transmission shaft 15. The transmission shaft 15 is arranged in the transmission shaft connection hole 15-1 of the transmission chassis 1, and realizes the transmission connection between the transmission shaft 15 and the transmission chassis 1 through the first fixing member 23, and the servo motor 14 drives the transmission shaft 15 to drive the transmission chassis 1 to rotate, The first shear box is rotated relative to the second shear box to generate hoop shear; the transmission shaft 15 is provided with a torque sensor for measuring the torque generated during hoop shear. As a preferred embodiment, the torque sensor in the present embodiment is a double-flange torque sensor 13, and the upper flange of the double-flange torque sensor 13 is connected to the fixed disc 10 on the transmission shaft 15 by fixing bolts 5. The lower flange and the torsion transmission disk 12 are fixed by fixing bolts 5; the torsion transmission disk 12 is connected with the transmission chassis 1 through the connecting column 11; Drive connection. As a preferred embodiment, as shown in Figure 3, the upper end of the connecting column 9 passes through the round hole reserved by the twist transmission disc 12; the lower end of the connecting column 9 is fixed to the transmission chassis 1 through the first fixing member 23 and the fixing bolt Connection; the transmission chassis 1 is fixedly connected with the transmission shaft 15 and the fixing bolts through the second fixing member 24 to realize the transmission connection between the transmission chassis 1 and the transmission shaft 15 .

When working, the servo motor 14 applies torsional power through the transmission shaft 15, the servo motor 14 drives the transmission shaft 15 to rotate, and the fixed disc 10 and the transmission chassis 1 follow the rotation of the transmission shaft 15. The rotating chassis 4 is used as the bottom part of the first shear box. When the transmission shaft 15 drives the transmission chassis 1 to rotate, the rotating chassis 4 will follow the rotation of the transmission chassis 1, so that the first shear box rotates relative to the second shear box. The sample in the cutting box is sheared in the circumferential direction, and the resistance suffered by the sample is transmitted to the lower flange of the double-flange torque sensor 13 through the rotating chassis 4, the transmission chassis 1, the connecting column 11, and the torsion disc 12 in sequence. The flange is twisted relative to the upper flange, and the torque is measured. The servo motor 14 in this embodiment can apply a hoop shearing force through a fixed angular velocity, and can also apply a hoop shearing force through a fixed torque.

It is worth noting that the accompanying drawings 6-7 of this embodiment provide two different fixing parts, wherein the first fixing part 23 and the second fixing part 24 are fixing parts with basically the same structure, only differing in size. The difference is that for the connection with the transmission shaft, since the transmission shaft is relatively thick, the second fixing member with a larger connection hole as shown in Figure 7 is selected. It can be understood that other fixing members with other structures and shapes that can realize the fixed connection of the two elements are also within the protection scope of the present invention.

The hoop shear test method of device provided by the invention is as follows:

The hoop shear test method of the hoop test device composed of the hoop shear components provided by embodiment 1 and embodiment 2 is basically the same, including the following steps:

S1. According to the shape of the sample to be tested, select the first movable element and the second movable element that are suitable, and select the corresponding installation positions on the rotating chassis 4 and the fixed chassis 7 to install the first shear box and the second shear box. Cut the box, place the sample to be tested in the first shear box and the second shear box, and the shear surface is located at the contact surface (interface) of the first shear box and the second shear box;

Specifically, for the sector-shaped sample, you can choose the sector-shaped first fixed top plate 3 and the first fixed stopper 2 that are suitable for the thickness, radius, and corresponding central angle, and select the corresponding installation position. On the chassis 4, form the first shear box of suitable specification. Simultaneously, select the second fixed top plate 8 and the second fixed block 6 of the matching fan ring and select the corresponding installation position, and install them on the fixed chassis 7 through the fixed screw 5 to form the second shear box of corresponding specifications. The fan-shaped inner material A19 and the fan-shaped outer material B20 are respectively placed in the first shear box and the second shear box, and the two material samples have a contact interface 18 .

For the annular sample, select the first ring-shaped fixed top plate 16 and the second ring-shaped fixed top plate 17 that are suitable for fixed installation on the rotating chassis 4 and the fixed chassis 7 respectively to form the first shear box and the second shear box. The annular inner material A21 and the annular outer material B22 are respectively placed in the first shear box and the second shear box, and the two material samples have a contact interface 18 . During use, the annular sample is punched at the position of the bolt hole 9, and the sample is fixed by the fixing bolt 5.

For the annular shearing parts provided in embodiment 1 and embodiment 2, the first shearing box and the second shearing box in the fan-shaped annular shearing parts corresponding to them respectively, for the convenience of observing the shearing damage In the process, the first fixed top plate 3 of the fan ring and the second fixed top plate 8 of the fan ring in the fan-shaped shearing part, the first fixed top plate 16 of the ring and the second fixed top plate 17 of the ring in the ring-shaped shearing part can cut the circle The positions of the structural surfaces are separated by a certain distance; for samples with higher strength, the upper fixed top plate can also be removed.

S2, fix the fixed chassis 7, start the servo motor 14, and rotate the chassis 4 as the bottom part of the first shear box, driven by the transmission shaft 15, so that the first shear box rotates relative to the second shear box, so that Appropriate loading method for circumferential shearing of the sample;

S3. When the sample is sheared in the circumferential direction, the resistance received is transmitted to the lower flange of the double-flange torque sensor 13 through the rotating chassis 4, the transmission chassis 1, the connecting column 11, and the torsion disc 12 in sequence. The upper flange produces relative torsion, and the double-flange torque sensor 13 measures the torque;

S4. By measuring the force under different parameter conditions, it can be tested that the thickness, radius, central angle size, material type, load action size and position, shear surface radius and other factors of the sample have an impact on the circular structural surface ring. Influence on the shear mechanical properties.

In the circumferential shearing part provided by the present invention, the first shearing box and the second shearing box are installed by a plurality of detachable and size-changing movable elements through fixing bolts, and can be composed of the first shearing box, the second shearing box, etc. The thickness, radius, corresponding central angle, and installation position of the second shearing box’s movable elements form shearing boxes of different specifications, so as to achieve circumferential shearing of samples of different materials, thicknesses, radii, and corresponding central angles. . Therefore, the present invention can study the influence of factors such as thickness, radius, central angle, material, load action size and position, and shear surface radius on the circumferential shear mechanical properties of the circular structural surface.

The shearing part of the present invention can be connected with an external driving mechanism, and the driving mechanism can apply a rotational torque so that the force is always perpendicular to the normal direction of the interface, thereby simplifying the circumferential shearing of the circular structural surface into a plane direct shearing Cutting can realize the research on the circumferential shear mechanical properties of circular structural surfaces, and solve the problem of difficult circumferential shear loading of circular structural surfaces.

The hoop shear component and test device provided by the invention can hoop shear a single material, and its function is similar to that of direct shear test and conventional hoop shear test, and can obtain relevant mechanical properties of materials. At the same time, unlike traditional shearing, since the shearing surface is circular, it is more in line with torsion engineering structures, such as pipes, piles, columns and other structures. Moreover, the hoop shear test device provided by the present invention can perform hoop shear on a sample whose interface between two materials is a circular structural surface, and can deeply explore the bond-slip performance of the material interface along the hoop direction. Therefore, the test device of the present invention can obtain mechanical parameters such as internal friction angle and cohesion force of a single material, and can also obtain shear mechanical properties of a circular structural surface for a sample combined with two materials. It can provide a reliable reference basis for the research on the circumferential force mechanism of circular structural surfaces such as pipes, pile foundations, columns and other materials, technical construction standards, daily maintenance, repair and repair effect evaluation.

The hoop shear test device provided by the invention can be applied to two kinds of shear samples, namely sector-shaped and annular. For the fan-shaped sample to be tested with a small central angle, multiple first and second fixed stops, first and second fixed top plates can be installed at the same time to form multiple first shear boxes and second shear boxes. , realize the circumferential shearing of multiple fan-ring samples, and improve the test efficiency.

For the accommodation cavity formed by the first and second shear cells, the sample does not need to fill the cavity in the radial direction, and only needs to make the shear surface be located on the contact surface of the shear cell. Since the sample is cut along the circular structural surface, the test It will not loosen in the radial direction.

In summary, the circular structural surface hoop shear component and test device provided by the present invention can be applied to circular structural surface hoop shear mechanical response tests, and the shape of the shear box is flexible, and can be applied to different sizes The sample to be tested can accurately obtain the mechanical parameters of the material and the mechanical parameters of the bond-slip performance of the material interface, which is helpful for the hoop shear mechanics mechanism of circular structural surfaces such as pipes, pile foundations, and columns, as well as different hoop loads Research on the mechanism of lower interface strength.

The above is only a preferred embodiment of the present invention, and does not therefore limit the patent scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or direct/indirect use All other relevant technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. A circular structural surface hoop shear component, characterized in that, The hoop shearing part is a movable and detachable hoop shearing part, including a chassis, and the chassis is mainly composed of a coaxial transmission chassis, a rotating chassis and a fixed chassis arranged circumferentially from the inside to the outside; The shaft center of the transmission chassis is provided with a transmission shaft connection hole for setting the transmission shaft and connecting with the external drive mechanism; the transmission chassis is fixed on the rotating chassis, and the rotating chassis is set on the fixed chassis and can rotate relative to the fixed chassis; The upper end surfaces of the rotating chassis and the fixed chassis are at the same level, and the upper end surface of the transmission chassis is higher than the upper end surfaces of the rotating chassis and the fixed chassis by a preset distance; It also includes a first shear box composed of the transmission chassis as the internal limiting part and the first movable element installed and fixed on the rotating chassis; The second shear box formed above; the first shear box has a first accommodation groove, the second shear box has a second accommodation groove, and the notch of the second accommodation groove communicates with the notch of the first accommodation groove to forming a holding chamber for holding the sample to be tested; Driven by an external transmission motor, the first shear box can rotate relative to the second shear box to generate hoop shearing. Specifically, the rotating chassis is used as the bottom part of the first shear box, and the transmission chassis is driven externally. The rotation driven by the mechanism drives the rotating chassis to rotate at the same time, and the second shear box is fixed, so that the first shear box rotates relative to the second shear box, and the sample in the box produces circumferential shear. 2. The circular structural surface hoop shear member according to claim 1, characterized in that, The movable and detachable circumferential shearing part is a fan-shaped sample shearing part, which is suitable for a fan-shaped shear sample; The first movable element that forms the first shear box includes two first fixed stops and a fan-shaped first fixed top plate; the transmission chassis is used as an internal limiter, and the two first fixed stops are arranged at intervals as two The side limit part, the first fixed top plate is used as the upper limit part, the first fixed top plate is fixedly connected with two first fixed stops arranged at intervals and fixedly installed on the rotating chassis, and the first shearing box is formed on the rotating chassis , forming a fan-shaped first accommodation groove; The second movable element that forms the second shear box includes two second fixed stops and a second fixed top plate, and the two second fixed stops are arranged at intervals and fixed on the fixed chassis as two-side limiting parts. The second fixed top plate is used as the upper limit part and is set close to the first fixed top plate and is fixedly connected with two second fixed stoppers arranged at intervals and fixedly installed on the fixed chassis, forming a second shear box on the fixed chassis to form a fan An annular second holding tank, the second shearing box is fixed on the bottom plate through the fixed chassis; the notch of the second holding tank communicates with the notch of the first holding tank to form a fan-shaped ring-shaped housing for containing the sample to be tested cavity. 3. The circular structural surface hoop shear member according to claim 2, characterized in that, The number of the first shearing box and the second shearing box is at least one. When the number of the first shearing box and the corresponding second shearing box is multiple, multiple sets of The first shear box composed of two spaced apart first fixed stops and the first fixed top plate is fixedly installed on the fixed chassis correspondingly with multiple sets of two spaced apart second fixed stops formed by the second fixed top plate. In the second shear box, the plurality of first shear boxes and the corresponding second shear boxes are arranged to form a plurality of accommodation cavities, which can realize circumferential shearing of a plurality of sector-shaped samples. 4. The circular structural surface hoop shear member according to claim 2 or 3, characterized in that, The first fixed block and the first fixed top plate forming the first shear box, and the second fixed block and the second fixed top plate forming the second shear box have thickness, radius, corresponding central angle size and position according to the Adjust the thickness, radius, corresponding central angle size and position of the cut sample to adapt to samples with different thickness, radius, central angle size and position. 5. The circular structural surface hoop shear member according to claim 2 or 3, characterized in that, The first fixed stop and the second fixed stop on the same side are located in the same radial direction and the inner and outer end faces and upper end faces of the stop are flush; the first fixed top plate covers the two first fixed blocks arranged at intervals. On the fixed block; the second fixed top plate is covered and arranged on the two second fixed blocks arranged at intervals to form a regular box body. 6. The circular structural surface hoop shear member according to claim 1, characterized in that, The movable and detachable circumferential shearing part is a circular sample shearing part, which is suitable for circular shearing samples; The first movable element constituting the first shearing box only includes an annular first fixed top plate, the transmission chassis is used as an internal stopper, the first fixed top plate is used as an upper stopper, and the inner side of the first fixed top plate is close to the transmission The outer side of the chassis is fixedly installed at a preset height above the rotating chassis, and a first shear box is formed on the rotating chassis to form a ring-shaped first receiving groove; The second movable element constituting the second shear box only includes an annular second fixed top plate, the second fixed top plate is used as the upper stop, and its inner side is set close to the outer side of the first fixed top plate, and is fixedly installed at a distance from The position of the preset height above the fixed chassis forms a second shear box on the fixed chassis to form an annular second accommodation groove; the notch of the second accommodation groove is communicated with the notch of the first accommodation groove to form an accommodating Ring chamber for test specimens. 7. The circular structural surface hoop shear member according to claim 6, characterized in that, The preset height between the first fixed top plate and the installation above the rotating chassis, and the preset height between the second fixed top plate and the installation above the fixed chassis are adjusted according to the thickness of the ring sample, so as to adapt to ring samples of different thicknesses. 8. The circular structural surface hoop shear member according to claim 7, characterized in that, The preset height at which the first fixed top board is installed above the rotating chassis is equal to the preset height at which the second fixed top board is installed at a distance above the fixed chassis. 9. A hoop shear test device, characterized in that it comprises the circular structural surface hoop shear component and a drive mechanism described in any one of claims 1-8, the drive mechanism is provided with a transmission shaft, and the transmission shaft is arranged on In the transmission shaft connection hole of the transmission chassis, and realize the transmission connection between the transmission shaft and the transmission chassis through the first fixing member, the drive mechanism drives the transmission shaft to drive the transmission chassis to rotate, so that the first shear box rotates relative to the second shear box, Circumferential shearing is generated; a torque sensor is provided on the drive shaft to measure the torque generated during circumferential shearing. 10. The hoop shear test device according to claim 1, characterized in that, The drive mechanism exerts a hoop shearing force with a fixed angular velocity or a fixed torque.