CN109612926B - Vertical measurement device and measurement method for dynamic friction coefficient of prepreg - Google Patents
Vertical measurement device and measurement method for dynamic friction coefficient of prepreg Download PDFInfo
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- CN109612926B CN109612926B CN201910059513.2A CN201910059513A CN109612926B CN 109612926 B CN109612926 B CN 109612926B CN 201910059513 A CN201910059513 A CN 201910059513A CN 109612926 B CN109612926 B CN 109612926B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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Abstract
The invention provides a vertical measurement device and a measurement method for dynamic friction coefficient of prepreg, wherein the device comprises a support frame, a workbench arranged on the support frame, a pressing module, a guiding module and a traction module connected with the support frame, wherein the workbench is used for fixing the prepreg; the pressure applying module comprises a pressure adjusting module and a friction pair which is detachably connected with the pressure adjusting module, the friction pair is abutted with the prepreg on the workbench to form a friction surface in the measuring process, and the pressure adjusting module adjusts the pressure applying size of the friction pair; the guide module is connected with the workbench and can enable the workbench to slide along the vertical direction; the traction module is provided with a traction mechanism moving along the vertical direction and is used for traction the workbench to move along the vertical direction so as to enable the prepreg on the workbench to move relative to the friction byproducts. According to the invention, by measuring in a vertical state, the relation between the dynamic friction coefficient and the material deformation mechanism can be explored through measurement, and the diversity of dynamic friction coefficient measurement modes is increased.
Description
Technical Field
The invention relates to the field of physical experiment devices, in particular to a vertical measurement device and a vertical measurement method for dynamic friction coefficient of prepreg.
Background
The friction performance of a material is one of very important performances, and is classified into sliding friction, rolling friction and static friction by the nature of movement. The dynamic friction coefficient is the ratio between the friction and positive pressure when objects in contact with each other are in relative motion. The existing friction coefficient measuring devices are various, but most of the friction coefficient measuring devices are horizontal measuring devices, the occupied area is large, the problems of high price and single measuring mode generally exist, and the relation between the friction coefficient and the material deformation mechanism cannot be effectively measured.
Disclosure of Invention
The invention provides a vertical measurement device and a measurement method for dynamic friction coefficient of prepreg, and aims to solve the problems that the existing dynamic friction coefficient measurement device is single in measurement mode and cannot effectively measure the relation between friction coefficient and material deformation mechanism.
The invention is realized in the following way:
the vertical measurement device for the dynamic friction coefficient of the prepreg comprises a support frame, a workbench, a pressing module, a guide module and a traction module, wherein the workbench, the pressing module, the guide module and the traction module are arranged on the support frame; the workbench is used for fixing the prepreg cloth; the pressure applying module comprises a pressure adjusting module and a friction pair which is detachably connected with the pressure adjusting module, wherein the friction pair is abutted against the prepreg on the workbench to form a friction surface in the measuring process, and the pressure adjusting module is used for adjusting the pressure applying size of the friction pair; the guide module is connected with the workbench and can enable the workbench to slide along the vertical direction; the traction module is provided with a traction mechanism moving along the vertical direction and is used for dragging the workbench to move along the vertical direction so as to enable the prepreg on the workbench and the friction byproduct to move relatively.
Further, in a preferred embodiment of the present invention, the pressure adjusting module includes a fixing frame, and a plurality of elastic members and locking members disposed in the fixing frame, wherein the fixing frame is connected to the frame, the elastic members are fixed to the fixing frame to apply an elastic force to a friction pair connected to the fixing frame, and the locking members control a compression amount of the elastic members to adjust the magnitude of the elastic force.
Further, in a preferred embodiment of the present invention, the friction pair has a friction plate contacting with the prepreg and a fixing plate for connecting with the pressure adjusting module, a chamfer is provided at a connection portion of the friction plate and the fixing plate, and an area ratio of the friction plate to the workbench is 1:3-1:5.
Further in the preferred embodiment of the present invention, the traction module is a mechanical stretcher.
Further, in a preferred embodiment of the present invention, a fixing portion is provided at one end of the working table, and a wire rope of the mechanical stretcher is connected to the fixing portion to pull the working table to move in a vertical direction.
Further, in a preferred embodiment of the present invention, both the table and the friction pair are made of a transparent material.
Further, in a preferred embodiment of the present invention, a clamping member is further provided on the table, and the prepreg is fixed on the table by the clamping member.
Further, in a preferred embodiment of the present invention, the pressure adjusting device further includes a limiting module, the limiting module includes a fixing pin disposed on the frame and a limiting plate disposed on the pressure adjusting module, a plurality of pin holes are disposed on the limiting plate, and the fixing pin cooperates with the pin holes to limit the pressure adjusting module.
Further, in a preferred embodiment of the present invention, the guiding module includes a sliding rail and a slider slidingly connected to the sliding rail, the sliding rail is fixed to the frame, and the working table is fixedly connected to the slider.
The invention also provides a measuring method of the dynamic friction coefficient of the prepreg, which is applied to the vertical measuring device of the friction coefficient of the prepreg and comprises the following steps:
s1, fixing prepreg cloth to be tested on the workbench;
s2, moving the workbench fixed with the prepreg into a test site along the vertical direction, wherein the test site is positioned at the force application position of the pressure application module;
s3, adjusting the pressing module to apply a preset positive pressure value N to the prepreg cloth;
s4, the traction module is used for traction the workbench to move vertically and driving the prepreg on the workbench and the friction byproduct on the pressure application module to move relatively, and the area of the friction surface is kept constant in the moving process;
s5, measuring the traction force F in the uniform motion process of the workbench, and further calculating to obtain the dynamic friction coefficient of the prepreg as shown in the following formula:
μk＝(F-mg)/N
wherein μk is the dynamic coefficient of friction;
m is the mass sum of the workbench and the prepreg cloth, kg;
g is gravity acceleration, m/s 2 ；
F is traction force and N;
n is positive pressure and N.
The beneficial effects of the invention are as follows:
(1) The vertical measurement device for the dynamic friction coefficient of the prepreg cloth, which is obtained through the design, has small occupied area and low cost, and when the vertical measurement device is used, the prepreg cloth is pulled to move in the vertical direction through the traction module, so that the material is subjected to experiments in the vertical state, the gap of a vertical measurement mode is filled, and the diversity of the dynamic friction coefficient measurement mode is increased;
(2) The material is subjected to the action of gravity when placed in a vertical state, and the upper part is thin, and the lower part is thick, so that the measuring instrument in the vertical mode can explore the relationship between the dynamic friction coefficient of the material and the deformation mechanism of the material through measurement;
(3) According to the invention, the pressure regulating module can freely regulate the positive pressure of the contact surface of the friction pair and the high polymer material in a certain range, so that the material can be measured for multiple times under different positive pressures, and the accuracy of the measurement result is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a vertical measurement device for dynamic friction coefficient of prepreg according to embodiment 1 of the present invention;
fig. 2 and 3 are schematic partial structures of a vertical measurement device for dynamic friction coefficient of prepreg according to embodiment 1 of the present invention (hidden traction module);
FIG. 4 is an enlarged partial schematic view at A in FIG. 3;
FIG. 5 is a schematic cross-sectional view of a pressing module in accordance with embodiment 1 of the present invention;
FIG. 6 is a schematic view showing the structure of a friction pair in embodiment 1 of the present invention;
fig. 7 is a schematic view of a partial structure of a vertical measurement device for dynamic friction coefficient of prepreg according to embodiment 2 of the present invention (hidden traction module);
FIG. 8 is a schematic cross-sectional view of a pressing module in embodiment 2 of the present invention;
fig. 9 is a schematic view showing the structure of a friction pair in embodiment 2 of the present invention.
Icon: 1-a supporting frame; 11-a base; 12-frame; 2-a workbench; 21-a fixing part; 22-clamping piece; 3-a pressing module; 31-a pressure regulation module; 311-fixing frame; 312-elastic members; 313-locking member; 32-friction pair; 321-friction plates; 322-a fixed plate; 323 chamfering; 4-a guiding module; 41-sliding rails; 42-sliding blocks; 5-a traction module; 6-a limit module; 61-fixing pins; 62-limiting plates; 63-pin holes; 7-a pressing module; 71-a pressure regulation module; 72-friction pair; 721-a fixed face; 722—friction surface; 723-chamfering; 8-a workbench.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Example 1
Referring to fig. 1 and 2, the invention provides a vertical measurement device for dynamic friction coefficient of prepreg, which comprises a support frame 1, a workbench 2 arranged on the support frame 1, a pressing module 3, a guiding module 4 and a traction module 5 connected with the support frame 1. The device utilizes the pressing module 3 to apply positive pressure to the prepreg on the workbench 2, the prepreg and the pressing module 3 are enabled to move relatively under the action of the traction module 5, and the magnitude of the friction coefficient of the high polymer material is calculated by acquiring related parameters. In the vertical state, the material is subjected to the action of gravity when being vertically placed, and the upper part is thin, and the lower part is thick, so that the measuring instrument in the vertical mode can explore the relation between the dynamic friction coefficient and the material deformation mechanism through measurement.
Referring to fig. 1 to 3, the support 1 includes a base 11 and a frame 12 fixedly connected to the base 11, the base 11 is connected to the traction module 5, and the frame 12 is connected to the table 2, the pressing module 3, and the guide module 4. The workbench 2 is used for fixing the prepreg cloth. The pressing module 3 includes a pressure adjusting module 31 and a friction pair 32 detachably connected to the pressure adjusting module 31. The friction pair 32 is abutted against the prepreg cloth on the workbench 2 to form a friction surface in the measuring process, and the pressure adjusting module 31 adjusts the pressing size of the friction pair 32. The guide module 4 is connected to the table 2 and enables the table 2 to slide in a vertical direction. The traction module 5 has a traction mechanism moving in the vertical direction for drawing the table 2 to move in the vertical direction so as to cause the prepreg on the table 2 to move relative to the friction pair 32. In the testing process, the traction module 5 pulls the workbench 2 to move at a constant speed along the vertical direction, so that the prepreg on the workbench 2 and the friction pair 32 move relatively, the material is subjected to experiments in the vertical state, the gap of a vertical measurement mode is filled, and the diversity of dynamic friction coefficient measurement modes is increased.
Alternatively, referring to fig. 1, the traction module 5 is a mechanical stretcher. The mechanical stretcher is provided with a traction beam moving along the vertical direction, and the traction beam is connected with the workbench 2 through a steel wire rope and is used for providing traction force for the workbench 2 so as to drive the prepreg cloth to move relatively with the friction plate 321 on the friction pair 32 under the traction force. Optionally, the mechanical stretcher is provided with a stress-strain sensor, and the traction force of the support frame 1 can be obtained through the stress-strain sensor. The test experiment is finished by conveniently utilizing the existing instrument-mechanical tensile testing machine, and equipment such as an additional sensor is not required, so that the cost is reduced.
Alternatively, referring to fig. 3, a fixing portion 21 is provided at one end of the table 2, and a wire rope of the mechanical stretcher is connected to the fixing portion 21 to pull the table 2 to move in a vertical direction. By setting the stretching speed of the mechanical stretching machine, the material can be measured for multiple times at different movement speeds, and the accuracy of the measurement result is improved.
Optionally, referring to fig. 1, a clamping member 22 is further provided on the table 2, and the prepreg is fixed on the table 2 by the clamping member 22. Alternatively, the clamping member 22 may be a profile frame, and the prepreg is clamped on the table 2 by a compression bar of the profile frame, or may be other clamping members such as a clamp, so long as the clamping of the material can be achieved, and the invention is applicable.
Alternatively, referring to fig. 1 and 6, the table 2 and the friction pair 32 are both made of a transparent material. The transparent structure is beneficial to observing the change of the material in the extrusion and relative movement process by using the optical rheometer in the observation window of the fixing frame 311, and exploring the influence of the phenomena of heating, abrasion and the like in the friction movement process on the change of the surface morphology of the material or measuring the relationship between the friction coefficient and the deformation mechanism of the material, so as to facilitate further experimental study. Optionally, the transparent material is an acrylic plate. The acrylic plate has low cost, good light transmittance, impact resistance and easy cleaning. Alternatively, other transparent materials such as polystyrene, polycarbonate, etc. may be applied to the present invention as long as the application effect of the present invention can be achieved.
Alternatively, referring to fig. 4 and 5, the pressure adjusting module 31 includes a fixing frame 311, and a plurality of elastic members 312 and locking members 313 disposed in the fixing frame 311, wherein the fixing frame 311 is connected to the frame 12, the elastic members 312 are fixed to the fixing frame 311 to apply an elastic force to the friction pair 32 connected to the fixing frame 311, and the locking members 313 control the compression amount of the elastic members 312 to adjust the magnitude of the elastic force. Alternatively, other pressure regulating devices such as pressure control valves, pressure controllers, etc. may be employed in the present invention without departing from the spirit of the present invention.
Alternatively, referring to fig. 4 and 5, in this embodiment, the fixing frame 311 is formed by building a plurality of profile bars, where the profile bars include a plurality of X-direction bars, Y-direction bars, and Z-direction bars, and the X-direction bars, the Y-direction bars, and the Z-direction bars are connected to each other by a connecting piece, so as to form the fixing frame 311 having a frame structure. The elastic members 312 and the locking members 313 are fixed on the X-direction rod and/or the Z-direction rod at the bottom of the fixing frame 311, and an observation window is reserved in the middle of the fixing frame 311. Optionally, the connecting piece can be a fitting, a corner piece, a bolt and nut connection, a right angle or corner groove connecting piece, etc. matched with the punching and tapping, and the invention is not particularly limited.
Alternatively, referring to fig. 4 and 5, the elastic member 312 is a compression spring, the compression spring is fixed on the fixing frame 311, the friction pair 32 is connected to the fixing frame 311 through the fixing plate 322, and the locking member 313 includes a bolt, a washer, and a locking nut that is inserted into the compression spring and matches with the bolt. The gasket is inserted between the lock nut and the spring, and the compression amount of the spring can be changed by rotating the lock nut, so that an elastic force is applied to the friction plate 321, and the elastic force can be calculated by obtaining the compression amount of the elastic piece 312. Optionally, the lock nut in this embodiment includes a first lock nut and a second lock nut, where the first lock nut is used to cooperate with the bolt and the washer to adjust the compression amount of the compression spring. The fixing frame 311 is provided with a through hole matched with the bolt, and the bolt is inserted into the through hole and fixed on the fixing frame 311 through the second locking nut.
Alternatively, the elastic member 312 in the present embodiment is a compression spring, but the present invention is not limited thereto, and other elastic members 312 with a variable pressing force can be applied to the present invention as long as the effect of the present embodiment is achieved. By adjusting the elastic force, the positive pressure of the high polymer material in a certain range can be changed, so that the material can be measured for multiple times under different positive pressures, and the accuracy of the measurement result is improved.
Optionally, referring to fig. 6, the friction pair 32 has a friction plate 321 contacting with the prepreg cloth and a fixing plate 322 for connecting with the pressure adjusting module 31, and a chamfer 323 is provided at a connection portion of the friction plate 321 and the fixing plate 322, so that scratch resistance generated by a sharp surface and a material can be effectively avoided, and accuracy of a measurement result is reduced. The area ratio of the friction plate 321 to the workbench 2 is 1:3-1:5, so that the friction pair 32 can be conveniently replaced, and the influence of different shapes and sizes of friction surfaces in the friction pair 32 on the friction coefficient measurement result can be conveniently examined.
Alternatively, referring to fig. 2 and 3, the guide module 4 includes a slide rail 41 and a slider 42 slidably connected to the slide rail 41, the slide rail 41 is fixed to the frame 12, and the table 2 is fixedly connected to the slider 42. Alternatively, other types of guide modules 4, such as ball screw drives, rack and pinion drives, may be used with the present invention.
Optionally, referring to fig. 3 and 4, a limiting module 6 is further included, and in order to prevent the pressing module 3 from shaking before testing, it needs to be limited. The limiting module 6 comprises a fixing pin 61 arranged on the frame 12 and a limiting plate 62 arranged on the pressure adjusting module 31, a plurality of pin holes 63 are formed in the limiting plate 62, and the fixing pin 61 is matched with the pin holes 63 to limit the pressure adjusting module 31. In the test state, the pins of the fixing pin 61 are inserted into the pin holes 63 of the limiting plate 62 to limit the degree of freedom of the pressing module 3 in the vertical direction.
The invention also provides a measuring method of the dynamic friction coefficient of the prepreg, which is applied to the vertical measuring device of the friction coefficient of the prepreg and comprises the following steps:
s1, fixing the prepreg cloth to be tested on the workbench 2. Alternatively, the clamping member 22 may be a section frame, and the prepreg is clamped on the table 2 by a compression bar of the section frame, or may be other elements with a clamping function, which is not limited in detail in the present invention.
S2, moving the workbench 2 fixed with the prepreg into a test site along the vertical direction, wherein the test site is positioned at the force application position of the pressure application module 3. The degree of freedom of the pressure application module 3 in the vertical direction is limited by the limiting module 6, so that the pressure application module 3 is further prevented from shaking during the measurement process.
S3, adjusting the pressing module 3 to apply a preset positive pressure value N to the prepreg; optionally, multiple measurements can be performed by setting different positive pressure values, so that the measurement error of the device is reduced, and the measurement result is more accurate.
S4, the traction module 5 is used for traction the workbench 2 to vertically move, so that prepreg on the workbench 2 and the friction pair 32 on the pressing module 3 are driven to generate relative movement, and the area of the friction surface is kept constant in the movement process.
S5, measuring the traction force F in the uniform motion process of the workbench 2, and further calculating to obtain the dynamic friction coefficient of the prepreg as shown in the following formula:
μk＝(F-mg)/N
wherein μk is the dynamic coefficient of friction; m is the mass sum of the workbench and the prepreg cloth, kg; g is gravity acceleration, m/s 2 The method comprises the steps of carrying out a first treatment on the surface of the F is traction force and N; n is positive pressureForce, N. The traction force F may be obtained by a mechanical sensor, and the positive pressure N may be converted by the compression amount of the elastic member 312.
Example 2 as shown with reference to figure 1,
embodiment 2 of the present invention provides a vertical measurement device for dynamic friction coefficient of prepreg, which has the same implementation principle and technical effects as those of embodiment 1, and for brevity description, reference may be made to the corresponding contents in embodiment 1.
Referring to fig. 7-9, the pressing module 7 includes a pressure adjusting module 71 and a friction pair 72 fixed on the pressure adjusting module 71, the friction pair 72 is abutted against a prepreg on the workbench 8 to form a friction plane in the measuring process, the pressure adjusting module 71 adjusts the pressing size of the friction pair 72, the friction pair 72 has a fixing surface 721 and a friction surface 722, the fixing surface 721 is connected with the pressure adjusting module 71 through a connecting piece, a chamfer 723 is arranged at the edge of the friction surface 722, and the area ratio of the friction pair 72 to the workbench 8 is 1:1-1:2. In this embodiment, the friction pair 72 is fixedly connected with the pressure adjusting module 31 by adopting a simple flat plate design, so that the structure is simple, and the device cost is reduced.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The vertical measurement device for the friction coefficient of the prepreg cloth is characterized by comprising a support frame (1), a workbench (2), a pressing module (3), a guide module (4) and a traction module (5) connected with the support frame (1), wherein the support frame (1) comprises a base (11) and a frame (12) fixedly connected with the base (11), the base (11) is connected with the traction module (5), and the frame (12) is connected with the workbench (2), the pressing module (3) and the guide module (4); the workbench (2) is used for fixing the prepreg cloth; the pressing module (3) comprises a pressure adjusting module (31) and a friction pair (32) which is detachably connected with the pressure adjusting module (31), the friction pair (32) is abutted with the prepreg cloth on the workbench (2) to form a friction surface in the measuring process, and the pressure adjusting module (31) is used for adjusting the pressing size of the friction pair (32); the guide module (4) is connected with the workbench (2) and can enable the workbench (2) to slide along the vertical direction; the traction module (5) is provided with a traction mechanism which moves along the vertical direction and is used for dragging the workbench (2) to move along the vertical direction so as to enable the prepreg on the workbench (2) and the friction pair (32) to move relatively;
the pressure regulating module (31) comprises a fixing frame (311) and a plurality of elastic pieces (312) and locking pieces (313) which are arranged in the fixing frame (311), wherein the fixing frame (311) is connected with the frame (12), the elastic pieces (312) are fixed on the fixing frame (311) so as to apply elastic force to friction pairs (32) connected with the fixing frame (311), and the locking pieces (313) control the compression amount of the elastic pieces (312) so as to regulate the size of the elastic force;
the friction pair (32) is provided with a friction plate (321) in contact with the prepreg and a fixed plate (322) used for being connected with the pressure regulating module (31), a chamfer angle (323) is arranged at the joint of the friction plate (321) and the fixed plate (322), and the area ratio of the friction plate (321) to the workbench (2) is 1:3-1:5;
still include spacing module (6), spacing module (6) including set up in fixed pin (61) on frame (12) and set up in limiting plate (62) on pressure adjustment module (31), be provided with a plurality of pinholes (63) on limiting plate (62), fixed pin (61) with pinhole (63) cooperate, right pressure adjustment module (31) are spacing.
2. A vertical measurement device of the friction coefficient of prepregs according to claim 1, characterized in that the traction module (5) is a mechanical stretcher.
3. A vertical measurement device for friction coefficient of prepreg cloth according to claim 2, wherein one end of the working table (2) is provided with a fixing part (21), and the steel wire rope of the mechanical stretcher is connected to the fixing part (21) to pull the working table (2) to move along the vertical direction.
4. The vertical measurement device of the friction coefficient of prepregs according to claim 1, characterized in that the table (2) and the friction pair (32) are both made of transparent material.
5. The vertical measurement device for the friction coefficient of the prepreg cloth according to claim 1, wherein a clamping piece (22) is further arranged on the workbench (2), and the prepreg cloth is fixed on the workbench (2) through the clamping piece (22).
6. The vertical measurement device of the friction coefficient of the prepreg cloth according to claim 1, wherein the guiding module (4) comprises a sliding rail (41) and a sliding block (42) which is connected with the sliding rail (41) in a sliding way, the sliding rail (41) is fixed on the frame (12), and the workbench (2) is fixedly connected with the sliding block (42).
7. A method for measuring the friction coefficient of a prepreg, characterized in that the vertical measuring device for the friction coefficient of the prepreg according to any one of claims 1 to 6 is applied, comprising the steps of:
s1, fixing prepreg cloth to be tested on a workbench (2);
s2, moving the workbench (2) fixed with the prepreg into a test site along the vertical direction, wherein the test site is positioned at the force application position of the pressure application module (3);
s3, adjusting the pressing module (3) to apply a preset positive pressure value N to the prepreg;
s4, the traction module (5) is used for traction the workbench (2) to move vertically, so that prepreg on the workbench (2) and a friction pair (32) on the pressing module (3) are driven to move relatively, and the area of the friction surface is kept constant in the moving process;
s5, measuring the traction force F in the uniform motion process of the workbench (2), and further calculating to obtain the dynamic friction coefficient of the prepreg as shown in the following formula:
μk＝(F-mg)/N
wherein μk is the dynamic coefficient of friction;
m is the mass sum of the workbench and the prepreg cloth, kg;
g is gravity acceleration, m/s 2 ；
F is traction force and N;
n is positive pressure and N.
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| CN106908379A (en) * | 2017-03-24 | 2017-06-30 | 重庆邮电大学 | The controllable coefficient of sliding friction detection method and device of a kind of magnetosensitive rubber |
| CN209841648U (en) * | 2019-01-22 | 2019-12-24 | 厦门理工学院 | Vertical measuring device of preimpregnation cloth coefficient of dynamic friction |
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2019
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| JP2010043982A (en) * | 2008-08-14 | 2010-02-25 | Nippon Telegr & Teleph Corp <Ntt> | Dynamic friction coefficient measuring device and method |
| KR20120071075A (en) * | 2010-12-22 | 2012-07-02 | 대한전선 주식회사 | Apparatus and method of measuring frictional coefficient between conduit and power cables |
| CN102866106A (en) * | 2012-08-27 | 2013-01-09 | 武汉船用机械有限责任公司 | Mechanical property test method of non-metallic material |
| CN105527221A (en) * | 2015-12-10 | 2016-04-27 | 江南大学 | Frictional force simulation generator |
| CN106908379A (en) * | 2017-03-24 | 2017-06-30 | 重庆邮电大学 | The controllable coefficient of sliding friction detection method and device of a kind of magnetosensitive rubber |
| CN209841648U (en) * | 2019-01-22 | 2019-12-24 | 厦门理工学院 | Vertical measuring device of preimpregnation cloth coefficient of dynamic friction |
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