Device for testing friction performance of composite prepreg and testing method thereof
By using a sliding clamping mechanism driven by a telescopic cylinder and a heating element built into the heating plate, the friction performance testing device for composite prepregs solves the problems of uneven pressure and limited observation in the prior art, achieves high-precision simulation of friction behavior and data accuracy, and supports the optimization of composite molding processes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- NORTHWESTERN POLYTECHNICAL UNIV
- Filing Date
- 2026-06-16
- Publication Date
- 2026-07-21
Smart Images
Figure CN122430184A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of composite material performance testing technology, and in particular to a device and method for testing the friction properties of composite prepregs. Background Technology
[0002] Autoclave molding of composite materials is a core process for manufacturing aerospace main load-bearing structural components (such as wing panels and fuselage shells). This process involves laying prepreg onto a mold surface, where the high temperature and pressure environment provided by the autoclave allows the resin matrix to flow, impregnate, and ultimately cure, forming a dense structure with high fiber volume fraction and low porosity. However, due to the significant difference in thermal expansion coefficients between the prepreg and the rigid mold, unavoidable relative slippage occurs during the initial pressurization and heating stages. This interfacial friction behavior directly determines whether the prepreg can uniformly adhere to complex surfaces and is a key process factor affecting component dimensional accuracy, residual stress, and molding defects.
[0003] The prepreg-mold friction behavior during autoclave molding is a transient process involving strong coupling of multiple physical fields, with an extremely complex mechanism. Existing testing techniques have significant shortcomings, limiting the accuracy of testing and the observability of the process.
[0004] Firstly, in terms of applying normal pressure, existing technologies generally employ a four-corner independent spring compression structure. This method has inherent drawbacks: due to the inevitable fatigue deformation of springs after long-term use, and the difficulty in ensuring that the elastic coefficients of each spring are completely consistent, differences in output force exist at the four corners; furthermore, even small changes in compression can cause fluctuations in elastic force. These differences and fluctuations ultimately result in the inability to apply uniform surface pressure to the test sample, with different areas within the same plane experiencing varying forces, severely affecting the accuracy of experimental data. Simultaneously, inconsistent pressure at the four corners can also lead to unbalanced torque when the pressure plate slides along the guide post. The side with greater force may cause the pressure plate to tilt, increasing friction between the guide post and the pressure plate, and even causing a "jamming" phenomenon.
[0005] Secondly, regarding the heating method of the testing environment, existing technologies mostly use environmental chambers for global heating. This method, due to the enclosed chamber and small observation window, makes it difficult to achieve real-time visual observation of the prepreg friction interface, and cannot clearly capture dynamic processes such as resin flow, fiber damage, or sample slippage, resulting in limited observation capabilities. This hinders researchers from conducting in-depth analysis of the microscopic mechanisms and dynamic behavior during the friction process.
[0006] Existing testing techniques are limited by uneven pressure application and observation conditions, making it difficult to accurately simulate and characterize interfacial friction behavior under real process conditions, and thus unable to provide reliable data input for the simulation and optimization of composite material molding processes. Summary of the Invention
[0007] The purpose of this invention is to provide a testing device and method for the friction properties of composite prepregs to solve the problems existing in the prior art. It can realistically simulate the friction behavior of the prepreg-mold interface under autoclave molding conditions, with high testing accuracy, controllable process, and reliable data, and can provide accurate friction parameters to support the optimization of composite molding processes.
[0008] To achieve the above objectives, the present invention provides the following solution: This invention provides a device for testing the friction properties of composite prepregs, comprising: a frame body on which a guide assembly is mounted; the frame body is connected to the lower clamp of a universal testing machine; two sliding clamping mechanisms, each slidably mounted on the guide assembly; each sliding clamping mechanism is pushed by a telescopic cylinder and moves along a first direction to approach or move away from the other sliding clamping mechanism; the output pressure of the telescopic cylinder is adjustable; each sliding clamping mechanism has a first heating plate, the side of the first heating plate near the other sliding clamping mechanism having a mounting groove for placing a first test material, the outer surface of the first test material protruding from the mounting groove, and the first heating plate for heating the first test material; a tensile clamping mechanism located between the two sliding clamping mechanisms, which is pulled by the upper clamp of the universal testing machine to move along a second direction, the second direction being perpendicular to the first direction; the tensile clamping mechanism has a second heating plate, both sides of the second heating plate for fixing a second test material, and the second heating plate for heating the second test material; both the first heating plate and the second heating plate are provided with heating elements and temperature monitoring components.
[0009] Preferably, the guide assembly consists of four guide columns arranged in parallel.
[0010] Preferably, the frame includes a base, two side plates, and multiple support rods; the two side plates are arranged in parallel and spaced apart, and the lower end of each side plate is fixedly connected to the base; the two ends of each guide post are fixedly connected to each side plate respectively; the telescopic cylinder is fixed to the corresponding side plate; the bottom of the base has a connecting joint for connecting to a universal testing machine; each support rod is located between the two side plates and above the base to fix the upper ends of the two side plates together.
[0011] Preferably, a circumferential plate is fixed to one side of the first heating plate, and the interior of the circumferential plate and a portion of the sidewall of the first heating plate together form the mounting groove.
[0012] Preferably, the outer surface of the first test material protrudes 2mm~3mm from the mounting groove.
[0013] Preferably, the tensile clamping mechanism includes a tensile clamp, a second heating plate, and two annular pressure plates; the tensile clamp is fixed to one end of the second heating plate and is used to connect to the upper clamp of the universal testing machine; the two annular pressure plates are detachably fixed to both sides of the second heating plate; the annular pressure plates and the second heating plate are used to fix the second test material.
[0014] Preferably, the heating element is a heating wire, and the temperature monitoring component is a built-in thermocouple.
[0015] Preferably, the annular pressure plate has multiple through holes, and the second heating plate has connecting holes at the positions corresponding to each of the through holes; a connecting bolt for fixed connection is provided in each through hole and the connecting hole.
[0016] The present invention also provides a testing method based on the composite material prepreg friction performance testing device described in any one of the above claims, comprising the following steps: S1, cut each of the second test materials to a preset size, and fix them to the side wall of the corresponding second heating plate according to the preset laying angle to complete the preparation of the tension clamping mechanism; S2, cut each of the first test materials to a size that matches the corresponding mounting groove, and place them in the corresponding mounting groove to complete the preparation of each sliding clamping mechanism; S3, place the prepared tensile clamping mechanism between the two prepared sliding clamping mechanisms and install it on the guide assembly; connect the tensile clamping mechanism and the frame body to the upper and lower clamps of the universal testing machine respectively; control the corresponding sliding clamping mechanism to move and load according to the preset pressure value by each telescopic cylinder to complete the set pressure contact of the tensile clamping mechanism; S4, start each of the heating elements to heat according to the target temperature set in the experiment, and keep it at the target temperature for 5 minutes after reaching the target temperature value; S5, start the universal testing machine, so that it pulls the tensile clamping mechanism at a preset tensile speed and moves it at a constant speed, and the universal testing machine collects tensile force data in real time; S6 processes the collected tensile data: The peak tensile force that appears at the beginning of the stretching phase is selected as the maximum static friction force. This peak value corresponds to the resistance between the first test material and the second test material at the instant when they change from a static state to a sliding state. When the tension fluctuation value does not exceed 5% of the average tension value of the collected tension data, the tension data is determined to have entered a stable stage, and the average tension value of this stable stage is selected as the sliding friction force. Based on the sliding friction force and the contact pressure set in step S3, the friction coefficient is calculated using the formula μ = F. f / F n Calculate the coefficient of sliding friction, where μ is the coefficient of sliding friction, and F f For sliding friction, F n To determine the normal contact pressure, repeat the above test at least three times, and take the average of the multiple test results as the final friction coefficient under the temperature and pressure conditions.
[0017] Preferably, before S1, pressure sensors are installed between the tension clamping mechanism and each of the sliding clamping mechanisms to calibrate the applied pressure of the telescopic cylinder before the test.
[0018] The present invention achieves the following technical effects compared to the prior art: The composite prepreg friction performance testing device provided by this invention utilizes a structure in which two sliding clamping mechanisms are driven by a telescopic cylinder to move along a guide assembly. Taking advantage of the adjustable and uniform force characteristics of the telescopic cylinder, it effectively avoids problems such as uneven surface pressure caused by spring fatigue deformation, inconsistent elastic coefficients, and compression fluctuations. Simultaneously, the guide assembly provides stable guidance for the sliding clamping mechanisms, preventing tilting and jamming, ensuring uniform and stable application of normal pressure, and improving the accuracy of test data. By setting heating elements and temperature monitoring components in the first heating plate of the sliding clamping mechanism and the second heating plate of the tensile clamping mechanism, respectively, it achieves localized direct heating of the first and second test materials. Combined with the open device structure, it allows for real-time visual observation of the friction interface, clearly capturing the resin flow, fiber damage, and sample sliding dynamics. This accurately simulates the prepreg-mold interface friction behavior under autoclave molding conditions, providing reliable data support for the simulation and optimization of composite material molding processes.
[0019] This invention also provides a test method for the frictional properties of composite prepregs. Through standardized clamping, pressurization, heating, stretching, and data processing procedures, combined with the device's adjustable pressurization via dual-sided cylinders, precise local heating, and open visualization structure, it ensures stable and uniform contact and relative sliding between the first and second test materials under preset temperatures and normal pressures. This effectively avoids test errors caused by uneven pressure, temperature fluctuations, and abnormal sample slippage. Furthermore, by clearly defining the criteria for static and sliding friction, and employing a data processing method that uses the average value of a stable segment and multiple repetitions to average the results, the accuracy, repeatability, and reliability of the friction coefficient calculation are significantly improved. This method can truly reflect the frictional characteristics of the prepreg-mold interface under autoclave molding conditions, providing accurate and reliable frictional parameters for optimizing composite material molding processes. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of the overall structure of the composite material prepreg friction performance testing device provided by the present invention; Figure 2 This is a schematic diagram of the sliding clamping mechanism in the composite material prepreg friction performance testing device provided by the present invention; Figure 3 This is a schematic diagram of the tensile clamping mechanism in the composite material prepreg friction performance testing device provided by the present invention; Figure 4 This is a schematic diagram of the base structure in the composite material prepreg friction performance testing device provided by the present invention.
[0022] In the picture: 1-Stretch clamping mechanism; 11-Stretch chuck; 12-Second heating plate; 13-Annular pressure plate; 2-Sliding clamping mechanism; 21-First heating plate; 22-Circumferential plate; 3- Telescopic cylinder; 4-Side panels; 5-Base; 51-Base plate; 52-Connecting connector; 6-Guide column; 7-Support rod. Detailed Implementation
[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0024] The purpose of this invention is to provide a testing device and method for the friction properties of composite prepregs to solve the problems existing in the prior art. It can realistically simulate the friction behavior of the prepreg-mold interface under autoclave molding conditions, with high testing accuracy, controllable process, and reliable data, and can provide accurate friction parameters to support the optimization of composite molding processes.
[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0026] Example 1 This embodiment provides a device for testing the frictional properties of composite prepregs, such as... Figures 1-4 As shown, it includes: The frame body is equipped with guide components; the frame body is connected to the lower clamp of the universal testing machine. Two sliding clamping mechanisms 2 are slidably mounted on the guide assembly; the sliding clamping mechanism 2 is pushed by the telescopic cylinder 3 and moves along the first direction to approach or move away from the other sliding clamping mechanism 2; the output pressure of the telescopic cylinder 3 is adjustable; the sliding clamping mechanism 2 has a first heating plate 21, and the side of the first heating plate 21 near the other sliding clamping mechanism 2 is provided with an installation groove for placing the first test material, the outer surface of the first test material protrudes from the installation groove, and the first heating plate 21 is used to heat the first test material; The tensile clamping mechanism 1 is located between two sliding clamping mechanisms 2. It is pulled by the upper chuck of the universal testing machine to move along a second direction, which is perpendicular to the first direction. The tensile clamping mechanism 1 has a second heating plate 12. The two sides of the second heating plate 12 are used to fix the second test material, and the second heating plate 12 is used to heat the second test material. Heating elements and temperature monitoring components are provided in both the first heating plate 21 and the second heating plate 12.
[0027] The structure, which drives two sliding clamping mechanisms 2 to move along the guide assembly via a telescopic cylinder 3, effectively avoids uneven surface pressure caused by spring fatigue deformation, inconsistent elastic coefficients, and compression fluctuations by utilizing the adjustable output pressure and uniform force characteristics of the telescopic cylinder 3. At the same time, the guide assembly provides stable guidance for the sliding clamping mechanisms 2, preventing them from tilting or jamming, ensuring uniform and stable application of normal pressure, and improving the accuracy of test data. By setting heating elements and temperature monitoring components in the first heating plate 21 of the sliding clamping mechanism 2 and the second heating plate 12 of the tensile clamping mechanism 1 respectively, local direct heating of the first and second test materials can be achieved. Combined with the open device structure, the friction interface can be visualized in real time, clearly capturing the resin flow, fiber damage, and sample sliding dynamic process, thereby accurately simulating the prepreg-mold interface friction behavior under autoclave molding conditions, and providing reliable data support for the simulation optimization of composite material molding processes.
[0028] Specifically, the telescopic cylinder 3 extends and retracts to press the two sliding clamping mechanisms 2 onto the tensile clamping mechanism 1, thereby achieving pressure application and adjustment between the sliding clamping mechanism 2 and the tensile clamping mechanism 1. The composite material prepreg friction performance testing device provided in this embodiment can clamp various materials such as prepreg, film, mold block or honeycomb core, and can apply controllable temperature and pressure to accurately measure the static friction and sliding friction between different material interfaces, providing a reliable testing method for optimizing composite material molding processes.
[0029] Specifically, when the tensile clamping mechanism 1 moves along the second direction, the clamping of the two sliding clamping mechanisms 2 causes relative sliding between the first test material and the second test material, thereby achieving friction performance testing.
[0030] Among them, such as Figure 1 As shown, here are the settings instructions for the frame: In the optional solutions of this embodiment, a more preferred method is to use four parallel guide posts 6 as the guide assembly. A through-hole is provided on the sliding clamping mechanism 2 corresponding to the positions of the four guide posts 6. An appropriate clearance is maintained between the guide posts 6 and the through-holes of the sliding clamping mechanism 2 to ensure smooth sliding without wobbling.
[0031] In the optional embodiments of this example, a preferred embodiment is that the frame includes a base 5, two side plates 4, and multiple support rods 7; the two side plates 4 are arranged in parallel and spaced apart, and the lower end of each side plate 4 is fixedly connected to the base 5; the two ends of each guide post 6 are fixedly connected to each side plate 4 respectively (the two ends of the guide post 6 are fixed to the corresponding side plate 4 by bolts); the telescopic cylinder 3 is fixed to the corresponding side plate 4; the bottom of the base 5 has a connecting joint 52 for connecting to a universal testing machine (the base 5 includes a base plate 51 and a connecting joint 52, the connecting joint 52 is fixed below the base plate 51, and the side plates 4 are fixedly connected to the base plate 51; the connecting joint 52 is a standard 40 joint); each support rod 7 is located between the two side plates 4 and above the base 5 to fix the upper ends of the two side plates 4 together.
[0032] Among them, such as Figure 1 and Figure 3 As shown, the relevant settings of the sliding clamping mechanism 2 are explained below: In the optional solutions of this embodiment, it is more preferred that a circumferential plate 22 (square) is fixed on one side of the first heating plate 21, and the interior of the circumferential plate 22 and part of the sidewall of the first heating plate 21 together form an installation groove.
[0033] In the optional solutions of this embodiment, it is more preferred that the outer surface of the first test material protrudes 2mm~3mm from the mounting groove.
[0034] Among them, such as Figure 1and Figure 2 The following is a description of the relevant settings for the tension clamping mechanism 1: In the optional embodiments of this example, the preferred tensile clamping mechanism 1 includes a tensile clamp 11, a second heating plate 12, and two annular pressure plates 13; the tensile clamp 11 is fixed to one end of the second heating plate 12 and is used to connect with the upper clamp of the universal testing machine; the two annular pressure plates 13 are detachably fixed to both sides of the second heating plate 12; the annular pressure plates 13 and the second heating plate 12 are used to fix the second test material.
[0035] In the optional embodiments of this example, a preferred embodiment has multiple through holes on the annular pressure plate 13, and a connecting hole is provided on the second heating plate 12 corresponding to each through hole; a connecting bolt for fixed connection is provided in the through holes and connecting holes. By tightening the connecting bolt, the annular pressure plate 13 presses the second test material, thereby achieving a clamping effect.
[0036] Specifically, by controlling the compressed gas output of the air compressor (i.e., the contents of the telescopic cylinder 3), the output force of the telescopic cylinder 3 can be adjusted, thereby changing the normal pressure conditions between the mold and the prepreg. Combined with the temperature and pressure sensors mentioned above, friction-displacement curves under different temperatures and pressures can be obtained, ensuring uniform pressure distribution and precise temperature control during the test.
[0037] Regarding other related settings: In the optional solutions of this embodiment, it is more preferred that the heating element is a heating wire and the temperature monitoring component is a built-in thermocouple.
[0038] Example 2 This embodiment provides a testing method based on the composite material prepreg friction performance testing device of Embodiment 1, including the following steps: S1, cut each of the second test materials to the preset size, and fix them to the side wall of the corresponding second heating plate 12 according to the preset laying angle (attach the annular pressure plate 13 to the surface of the second test material, and gradually tighten it through the symmetrically distributed connecting bolts so that the clamping force between the annular pressure plate 13 and the second heating plate 12 is evenly distributed, ensuring that the second test material does not slip or wrinkle during the test), and complete the preparation of the tension clamping mechanism 1; S2, cut each first test material to the size that matches the corresponding mounting groove, and place them in the corresponding mounting groove (the mounting groove limits the position of the first test material to ensure that the first test material remains relatively stationary with respect to the mounting groove during the test), thus completing the preparation of each sliding clamping mechanism 2; S3, place the prepared tensile clamping mechanism 1 between the two prepared sliding clamping mechanisms 2 and install it on the guide assembly; connect the tensile clamping mechanism 1 and the frame body to the upper and lower chucks of the universal testing machine respectively (ensure that the moving direction of the tensile clamping mechanism 1 coincides with the loading axis of the universal testing machine); each telescopic cylinder 3 controls the corresponding sliding clamping mechanism 2 to move and load according to the preset pressure value, and completes the set pressure contact of the tensile clamping mechanism 1; S4, start each heating element to heat to the target temperature set in the experiment (i.e., heat the first test material and the second test material to the target temperature respectively; monitor the temperature change in real time through the temperature monitoring component (such as temperature sensor) set inside each heating plate), and keep warm for 5 minutes after reaching the target temperature value; S5, start the universal testing machine and make it pull the tensile clamping mechanism 1 at a preset tensile speed to move at a uniform speed (so that the first test material and the second test material are relatively displaced), and the universal testing machine collects tensile data in real time; S6 processes the collected tensile data: The peak tensile force that appears at the beginning of the stretching phase is selected as the maximum static friction force. This peak value corresponds to the resistance between the first test material and the second test material at the instant when they change from a static state to a sliding state. When the tension fluctuation value does not exceed 5% of the average tension value of the collected tension data, the tension data is determined to have entered a stable stage, and the average tension value of this stable stage is selected as the sliding friction force. Based on the sliding friction force and the contact pressure set in step S3, the friction coefficient is calculated using the formula μ = F. f / F n Calculate the coefficient of sliding friction, where μ is the coefficient of sliding friction, and F f For sliding friction, F n To determine the normal contact pressure, repeat the above test at least three times, and take the average of the multiple test results as the final friction coefficient under the temperature and pressure conditions.
[0039] Specifically, the above testing methods can accurately obtain the frictional performance parameters of prepregs under different temperatures, pressures, and laying angles, providing data support for the optimization of composite material molding process parameters.
[0040] Through standardized clamping, pressurization, heating, stretching, and data processing procedures, coupled with the device's adjustable pressurization via dual-sided cylinders, precise local heating, and open visualization structure, stable and uniform contact and relative sliding between the first and second test materials can be ensured under preset temperatures and normal pressures. This effectively avoids test errors caused by uneven pressure, temperature fluctuations, and abnormal sample slippage. Furthermore, by clearly defining the criteria for static and sliding friction, and employing a data processing method that combines the average value of stable segments with multiple repetitions and averaging, the accuracy, repeatability, and reliability of friction coefficient calculations are significantly improved. This allows for a true reflection of the frictional characteristics of the prepreg-mold interface under autoclave molding conditions, providing accurate and reliable friction parameters for optimizing composite material molding processes.
[0041] In the optional scheme of this embodiment, it is more preferred that, before S1, each component is assembled and a pressure sensor is respectively set between the tension clamping mechanism 1 and each sliding clamping mechanism 2 to calibrate the applied pressure of the telescopic cylinder 3 before the test.
[0042] Specifically, the pressure sensor is used to monitor the magnitude and uniformity of the normal pressure (i.e., in the first direction).
[0043] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.
Claims
1. A device for testing the frictional properties of composite prepregs, characterized in that: include: A frame body, on which a guide assembly is provided; the frame body is connected to the lower clamp of the universal testing machine; Two sliding clamping mechanisms are slidably mounted on the guide assembly; each sliding clamping mechanism is pushed by a telescopic cylinder and moves along a first direction to approach or move away from the other sliding clamping mechanism; the output pressure of the telescopic cylinder is adjustable; each sliding clamping mechanism has a first heating plate, and the side of the first heating plate near the other sliding clamping mechanism is provided with a mounting groove for placing a first test material, the outer surface of the first test material protrudes from the mounting groove, and the first heating plate is used to heat the first test material; A tensile clamping mechanism is located between the two sliding clamping mechanisms. It is pulled by the upper chuck of the universal testing machine to move along a second direction, which is perpendicular to the first direction. The tensile clamping mechanism has a second heating plate, the two sides of which are used to fix a second test material, and the second heating plate is used to heat the second test material. Both the first heating plate and the second heating plate are equipped with heating elements and temperature monitoring components.
2. The composite material prepreg friction performance testing device according to claim 1, characterized in that: The guiding component consists of four parallel guide columns.
3. The composite material prepreg friction performance testing device according to claim 2, characterized in that: The frame includes a base, two side plates, and multiple support rods; The two side plates are arranged in parallel and spaced apart, and the lower end of each side plate is fixedly connected to the base; the two ends of each guide post are fixedly connected to each side plate respectively; the telescopic cylinder is fixed to the corresponding side plate. The base has a connection connector at its bottom for connecting to a universal testing machine; Each of the support rods is located between the two side plates and above the base to securely connect the upper ends of the two side plates.
4. The composite material prepreg friction performance testing device according to claim 1, characterized in that: A circumferential plate is fixed to one side of the first heating plate, and the interior of the circumferential plate and part of the sidewall of the first heating plate together form the mounting groove.
5. The composite material prepreg friction performance testing device according to claim 1, characterized in that: The outer surface of the first test material protrudes 2mm~3mm from the mounting groove.
6. The composite material prepreg friction performance testing device according to claim 1, characterized in that: The stretching clamping mechanism includes a stretching chuck, a second heating plate, and two annular pressure plates; The tensile clamp is fixed to one end of the second heating plate and is used to connect with the upper clamp of the universal testing machine. The two annular pressure plates are detachably fixed to both sides of the second heating plate; The annular pressure plate and the second heating plate are used to fix the second test material.
7. The composite material prepreg friction performance testing device according to claim 1, characterized in that: The heating element is a heating wire, and the temperature monitoring component is a built-in thermocouple.
8. The composite material prepreg friction performance testing device according to claim 6, characterized in that: The annular pressing plate has multiple through holes, and the second heating plate has connection holes corresponding to the positions of each of the through holes; A connecting bolt for fixed connection is provided in the through hole and the connecting hole.
9. A test method for the composite material prepreg friction performance testing device according to any one of claims 1 to 8, characterized in that: Includes the following steps: S1, cut each of the second test materials to a preset size, and fix them to the side wall of the corresponding second heating plate according to the preset laying angle to complete the preparation of the tension clamping mechanism; S2, cut each of the first test materials to a size that matches the corresponding mounting groove, and place them in the corresponding mounting groove to complete the preparation of each sliding clamping mechanism; S3, place the prepared tensile clamping mechanism between the two prepared sliding clamping mechanisms and install it on the guide assembly; connect the tensile clamping mechanism and the frame body to the upper and lower clamps of the universal testing machine respectively; control the corresponding sliding clamping mechanism to move and load according to the preset pressure value by each telescopic cylinder to complete the set pressure contact of the tensile clamping mechanism; S4, start each of the heating elements to heat according to the target temperature set in the experiment, and keep it at the target temperature for 5 minutes after reaching the target temperature value; S5, start the universal testing machine, so that it pulls the tensile clamping mechanism at a preset tensile speed and moves it at a constant speed, and the universal testing machine collects tensile force data in real time; S6 processes the collected tensile data: The peak tensile force that appears at the beginning of the stretching phase is selected as the maximum static friction force. This peak value corresponds to the resistance between the first test material and the second test material at the instant when they change from a static state to a sliding state. When the tension fluctuation value does not exceed 5% of the average tension value of the collected tension data, the tension data is determined to have entered a stable stage, and the average tension value of this stable stage is selected as the sliding friction force. Based on the sliding friction force and the contact pressure set in step S3, the friction coefficient is calculated using the formula μ = F. f / F n Calculate the coefficient of sliding friction, where μ is the coefficient of sliding friction, and F f For sliding friction, F n To determine the normal contact pressure, repeat the above test at least three times, and take the average of the multiple test results as the final friction coefficient under the temperature and pressure conditions.
10. The method for testing the friction properties of composite prepregs according to claim 9, characterized in that: Before S1, the components are assembled and pressure sensors are installed between the tension clamping mechanism and each of the sliding clamping mechanisms to calibrate the applied pressure of the telescopic cylinder before the test.