Device and method for testing interface friction of prepreg at any fiber laying angle

Abstract

The invention belongs to the technical field of friction experiment equipment, and relates to a device and a method for testing friction of a prepreg interface at any fiber laying angle. The device comprises a first clamping assembly used for fixing a first prepreg layer, a second clamping assembly used for fixing a second prepreg layer and a third material clamping assembly used for clamping a third prepreg layer, and the third material clamping assembly is clamped between the first clamping assembly and the second clamping assembly. The material clamping assembly comprises a material clamping part and a connecting part; the material clamping part comprises a material winding body and a pressing plate, and the material winding body is wrapped with the third prepreg layer; the material winding body comprises a middle clamping plate and a material winding block, and the middle clamping plate and the connecting part are located between the two pressing plates; the material winding block penetrates through the two pressing plates and the connecting part, and the two sides of the material winding block protrude out of the two pressing plates. The material winding block is in a regular hexagon shape, and the third prepreg layer is laid on any two opposite sides. The problems of tedious operation and low test efficiency in the prior art are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of friction test equipment, and in particular relates to a device and method for testing the interface friction of prepregs with arbitrary fiber laying angles. Background Art

[0002] With the progress and development of science and technology, composite materials are increasingly used in the aerospace field, especially technologies such as automatic tape laying and automatic wire laying, which have been rapidly developed and applied due to their high molding efficiency and stable product quality. Friction is a very important factor in the molding process of thin-walled composite components (automatic laying, molding, stamping and other processes). Friction often hinders the slippage between prepreg layers due to friction in the curvature of the tape, resulting in defects such as wrinkles, which greatly affects the appearance quality and mechanical properties of composite components. The prepreg preforming process includes friction between prepregs, between prepregs and molds, and between prepregs and vacuum bag films. Therefore, accurately grasping the friction in the preforming process of uncured prepregs has guiding significance and important engineering significance for evaluating the defects of composite components during the molding process and numerical simulation.

[0003] After searching, the patent document with publication number CN111272647A discloses a prepreg friction test device and method, which has a complex prepreg layer fixing method, cumbersome test method operation, low test efficiency and is not suitable for testing a large number of experimental samples. The test environment temperature of the prepreg friction test device and method is difficult to control, especially in automatic placement molding processes or other molding processes with high environmental requirements. The experimental data characterizing the friction and slip characteristics of the prepreg is not accurate enough. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for testing the interface friction of prepregs with arbitrary fiber laying angles, which solves the problems of complicated operation and low testing efficiency in the prior art.

[0005] The present invention is achieved through the following technical solutions: A device for testing interface friction of prepreg with arbitrary fiber laying angles, comprising: A clamping assembly, the clamping assembly comprising a first clamping assembly and a second clamping assembly that are symmetrically arranged, the first clamping assembly being used to fix the first prepreg layer; The second clamping assembly has the same structure as the first clamping assembly; The second clamping assembly is used to fix the second prepreg layer; The first prepreg layer and the second prepreg layer are fixed along any laying fiber angle, and the lateral distance between the first clamping assembly and the second clamping assembly is adjustable; a third material clamping assembly, the third material clamping assembly being used to clamp a third prepreg layer, the third material clamping assembly being clamped between the first clamping assembly and the second clamping assembly, and being able to slide relative to the first clamping assembly and the second clamping assembly; The material clamping assembly comprises a material clamping portion and a connecting portion; The material clamping part comprises a material winding body and a pressing plate, the third prepreg layer is wrapped on the material winding body, and the pressing plate is used to press the third prepreg layer onto the material winding body; The material winding body includes an intermediate clamping plate and a material winding block, wherein the intermediate clamping plate and the connecting portion are located between the two pressing plates; the material winding block runs through the two pressing plates and the connecting portion, and both sides protrude outside the two pressing plates, so that the two side surfaces of the third prepreg layer are respectively bonded to the first prepreg layer and the second prepreg layer; The material winding block is a regular hexagon, and the third prepreg layer can be laid on any two opposite sides to meet the angle change.

[0006] Further, the first clamping assembly includes a first fixed plate, a first stopper and a first material clamping assembly, the first fixed plate is prefabricated with a groove; the first material clamping assembly is embedded in the groove; the first stopper is installed at the upper and lower ends of the first fixed plate to clamp the first material clamping assembly; The first material clamping assembly includes two first pressing plates, two first pressing sheets and a first material bonding plate; the first prepreg layer is wound around the first material bonding plate, and the two first pressing sheets are used to press the left and right sides of the first prepreg layer; The two first pressing plates are respectively installed at the upper and lower ends of the first material bonding plate, and the two first pressing plates are respectively used to press the upper end and the lower end of the first prepreg layer.

[0007] Furthermore, V-shaped grooves are prefabricated on the upper surface and the lower surface of the first material bonding plate.

[0008] Furthermore, the components of the first clamping assembly are connected by bolts; and the components of the first material clamping assembly are connected by bolts.

[0009] Furthermore, one end of the connecting portion is fixedly connected to the material clamping portion, and the other end is fixedly connected to the universal testing machine; The universal testing machine applies a pulling force to the material clamping part through the connecting part, thereby driving the material winding block to move.

[0010] Furthermore, it also includes a fixed plate platform, and a baffle is arranged on the fixed platform. The baffle includes a first baffle and a second baffle, and a bracket rod is connected between the first baffle and the second baffle.

[0011] Furthermore, a guide rail is provided between the first baffle plate and the second baffle plate, and the first clamping assembly and the second clamping assembly are slidably connected to the guide rail.

[0012] Further, the device needs to cooperate with the micro cylinder. The micro cylinder is placed at the center of the first baffle, and the driving end of the micro cylinder can abut against the first clamping assembly to drive the first clamping assembly to move along the guide rail; An adjusting piece is installed on the outer side of the second clamping assembly.

[0013] Furthermore, the arbitrary fiber laying angle prepreg interface friction test device is placed in an environmental box to reach the temperature required for the experiment.

[0014] The present invention also discloses a testing method based on the arbitrary laying fiber angle prepreg interface friction testing device, comprising the following process: Fixing the first prepreg layer on the first clamping assembly at a fiber laying angle required by the experiment; Fixing the second prepreg layer on the second clamping assembly at a fiber laying angle required by the experiment; Placing the first prepreg layer and the second prepreg layer opposite to each other; Fixing the third prepreg layer on the material clamping part, and fixedly connecting the material clamping part with the connecting part to form a material clamping assembly; placing the material clamping assembly between the first clamping assembly and the second clamping assembly; Pushing the first clamping assembly and the second clamping assembly to move toward each other so as to clamp the material clamping assembly in the middle, so that the third prepreg layer is respectively bonded to the first prepreg layer and the second prepreg layer; A tensile force is applied to the connection portion, the third prepreg layer is caused to slide relative to the first prepreg layer and the second prepreg layer, and the tensile force value is read.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a prepreg interface friction test device with arbitrary laying angles, including a first clamping assembly and a second clamping assembly, and a third material clamping assembly. The third material clamping assembly is clamped between the first clamping assembly and the second clamping assembly, and can slide relative to the first clamping assembly and the second clamping assembly; the first clamping assembly clamps the first prepreg layer, the second clamping assembly is used to fix the second prepreg layer, and the three material clamping assemblies are used to clamp the third prepreg layer. The present invention has carried out targeted design of the material clamping assembly, the material clamping part includes a material winding body and a pressing plate, the material winding body includes an intermediate clamping plate and a material winding block, and the intermediate clamping plate and the connecting part are located between the two pressing plates; the material winding block runs through the two pressing plates and the connecting part, and the two sides protrude outside the two pressing plates; so that the two sides of the third prepreg layer are respectively attached to the first prepreg layer and the second prepreg layer; the material winding block is a regular hexagon, and the third prepreg layer can be laid with any two opposite sides to meet the angle change. Through the polygonal design of the material winding block, multi-angle relative friction testing can be achieved. The test device designed in the present invention has a very wide range of uses and can simultaneously measure the friction coefficients between prepreg layers and between the prepreg and the laying interface at different temperatures, different pressures, different relative speeds and arbitrary orientations; the prepreg layers can be reliably fixed while simplifying the experimental operation and improving the test efficiency; friction testing of the prepreg layers at any angle can be achieved, avoiding the influence of the experimental environment on the friction coefficient.

[0016] Furthermore, the first clamping assembly and the second clamping assembly designed in the present invention are both detachably connected, specifically the material clamping assembly is embedded in the fixing plate as a module, so that after an experiment is completed, the material clamping assembly can be quickly replaced without removing the fixing plate, reducing the replacement and installation time, and greatly improving the experimental efficiency. Traditional testing devices generally require at least two people to replace them over a long period of time before the next experiment can be carried out.

[0017] Furthermore, the present invention also designs an environmental chamber, and places the prepreg interface friction test device with any fiber laying angle in the environmental chamber to reach the temperature required for the experiment. The temperature is uniform, unlike the previous method of adding a heating element on the fixed plate, which leads to a complex structure of the friction test device, uneven temperature, and inaccurate measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the assembly of a prepreg interface friction test device for any laying angle provided by an example of the present invention in conjunction with a universal testing machine and an environmental chamber; Figure 2 Schematic diagram of a prepreg interface friction test device for any laying angle provided by an example of the present invention; Figure 3It is a schematic diagram of the first clamping assembly of the prepreg interface friction test device for any laying angle provided by an example of the present invention; Figure 4 It is a schematic diagram of the positional relationship of various parts of the first clamping assembly of the prepreg interface friction testing device for arbitrary laying angles provided by an example of the present invention.

[0019] Figure 5 It is a schematic diagram of the first material clamping assembly of the prepreg interface friction testing device at any laying angle provided by an example of the present invention.

[0020] Figure 6 It is a front view of the first material clamping assembly of the prepreg interface friction testing device at any laying angle provided by an example of the present invention.

[0021] Figure 7 yes Figure 6 A partial cross-sectional view along the AA direction; Figure 8 yes Figure 6 A partial cross-sectional view along the BB direction; Fig. 9 It is a schematic diagram of the third material clamping assembly of the prepreg interface friction testing device for arbitrary laying angles provided by an example of the present invention; Fig.10 is a partial schematic diagram of a third material clamping assembly of a prepreg interface friction test device at any laying angle provided by an example of the present invention, including three different clamping angles of the third prepreg; Fig.11 It is a front view of the third material clamping assembly of the prepreg interface friction testing device for any laying angle provided by an example of the present invention; Fig.12 It is a schematic diagram of material winding of the third material clamping assembly of the prepreg interface friction testing device for arbitrary laying angles provided by an example of the present invention; In the figure: 1. Clamping assembly; 1-1. First clamping assembly; 1-1-1. First fixing plate; 1-1-1-1. First slideway; 1-1-2. First stopper; 1-1-3. First material clamping assembly; 1-1-3-1, first pressing plate; 1-1-3-2, first pressing sheet; 1-1-3-3, first material bonding plate; 2. Adjusting piece; 3. Third material clamping assembly; 3-1. Material clamping part; 3-1-1. Material winding body; 3-1-2. Pressing plate; 3-2. Connecting part; 4. Fixed platform; 5-1. First baffle; 5-2. Second baffle; 6. Support rod; 7. Guide rail; 8. Micro cylinder; 9. Universal testing machine; 9-1. Universal testing machine connector; 9-2. Tensile force sensor; 10-1, first prepreg layer; 10-2, second prepreg layer; 10-3, third prepreg layer; 11. Environmental chamber; 12. Slide rail. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clear, the following is further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, not all embodiments.

[0023] The components described and shown in the drawings and embodiments of the present invention may be arranged and designed in various configurations. Therefore, the detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely represents a selected embodiment of the present invention. Based on the drawings and embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] It should be noted that the terms "comprises", "includes" or any other variants are intended to cover non-exclusive inclusion, so that a process, element, method, article or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to the process, element, method, article or device. In addition, the terms "horizontal" and "vertical" are based on the orientation and positional relationship of the devices or components shown in the drawings, and are only for the purpose of better describing the present invention, rather than requiring the devices, components or equipment shown to have this specific orientation, and therefore cannot be understood as limiting the present invention.

[0025] The features and performances of the present invention are further described in detail below in conjunction with the embodiments.

[0026] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The features and performances of the present invention are further described in detail below in conjunction with the embodiments.

[0028] like Figure 2As shown, the prepreg interface friction test device with any laying angle provided by the present invention includes a clamping assembly 1 and a material clamping assembly 3, wherein the clamping assembly 1 includes a first clamping assembly 1-1 and a second clamping assembly 1-2 that are symmetrically arranged, the first clamping assembly 1-1 and the second clamping assembly 1-2 have the same structure, and the lateral distance between the first clamping assembly 1-1 and the second clamping assembly 1-2 is adjustable. The first clamping assembly 1-1 is used to fix the first prepreg layer 10-1, the second clamping assembly 1-2 is used to fix the second prepreg layer 10-2, and the material clamping assembly 3 is used to fix the third prepreg layer 9-3.

[0029] Specifically, Figure 1 As shown, the prepreg interface friction test device for any laying angle provided in this example also includes a fixed platform 4. The lower surface of the fixed platform 4 is connected to the universal testing machine joint 9 to ensure the stability of the fixed platform 4. Baffles are fixedly arranged at both ends of the upper surface of the fixed platform 4, and the baffles include a first baffle 5-1 and a second baffle 5-2, which are respectively fixed at both ends of the upper surface of the fixed platform 4. There are two support rods 6 connected between the upper ends of the first baffle 5-1 and the second baffle 5-2 to ensure that the device has sufficient rigidity.

[0030] Furthermore, a guide rail 7 is provided between the first baffle 5-1 and the second baffle 5-2, and one end of the guide rail 7 has a larger diameter than the guide rail, and the end of the guide rail 7 with a larger diameter is fixed to one side of the second baffle 5-2. The guide rail 5 is used as a sliding track for the first clamping assembly 1-1, the second clamping assembly 1-2 and the adjustment plate 2. The number of guide rails 5 is set to 4, and four tracks 5 can ensure the rigidity and sliding stability of the device. The adjustment plate 2 is mainly used to adjust the lateral position of the second clamping assembly 1-2 to ensure that the two side surfaces of the third prepreg layer 10-3 are tightly fitted with the first prepreg layer 10-1 and the second prepreg layer 10-2 respectively.

[0031] The prepreg interface friction test device for any laying angle provided in this example also includes a micro cylinder 8 (different cylinder models can be selected according to the pressure, and a hydraulic jack can be selected for high pressure). The thrust of the micro cylinder is mainly determined by the pressure regulating valve, which is connected between the air pump and the micro cylinder 8 through an air pipe with a diameter of 8 mm. The micro cylinder 8 is used to drive the first clamping assembly 1-1, the second clamping assembly 1-2 and the adjustment plate 2 to move, thereby providing a clamping force to the material clamping assembly 3, and the material clamping assembly 3 is clamped between the first clamping assembly 1-1 and the second clamping assembly 1-2. Specifically, the cylinder body of the micro cylinder 8 is placed at the center of the first baffle 5-1, the driving end of the micro cylinder 8 is in contact with the first clamping assembly 1-1, and the driving end drives the first clamping assembly 1-1, the second clamping assembly 1-2 and the adjustment sheet 2 to slide along the guide rail, so that one side of the adjustment sheet 2 is tightly fitted with one side of the second baffle 5-2, and the other side of the adjustment sheet 2 is tightly fitted with the second clamping assembly 1-2, and the first clamping assembly 1-1 and the second clamping assembly 1-2 clamp the material clamping assembly 3. The output pressure of the micro cylinder in this embodiment varies from 0 MPa to 1 MPa.

[0032] Since the first clamping assembly 1-1 and the second clamping assembly 1-2 have the same structure, the first clamping assembly 1-1 is used as an example for description in this embodiment. Figure 3-Figure 6 As shown, the first clamping assembly 1-1 includes a first fixed plate 1-1-1, two first stoppers 1-1-2, and a first material clamping assembly 1-1-3.

[0033] A dovetail groove is formed on the first fixing plate 1-1-1, and the first material clamping assembly 1-1-3 is embedded in the dovetail groove.

[0034] The first fixing plate 1 - 1 - 1 is used to directly abut against the material clamping assembly 3 so that the first prepreg layer 10 - 1 and the third prepreg layer 10 - 3 are attached to each other.

[0035] like Figure 4 As shown, four first slideways 1-1-1-1 are arranged on the first fixed plate 1-1-1, and four guide rails 7 are passed through the first slideways 1-1-1-1, so that the first clamping assembly 1-1 as a whole can slide along the guide rails 7 more smoothly.

[0036] In addition, if Figure 5-Figure 8As shown, the first material clamping assembly 1-1-3 includes two first pressing plates 1-1-3-1, two first pressing sheets 1-1-3-2 and a first material bonding plate 1-1-3-3; the first prepreg layer 10-1 is wound on the first material bonding plate 1-1-3-3, the two first pressing sheets 1-1-3-2 are used to press the left and right sides of the first prepreg layer 10-1, the two first pressing plates 1-1-3-1 are respectively installed at the upper and lower ends of the first material bonding plate 1-1-3-3, and the two first pressing plates 1-1-3-1 are respectively used to press the upper and lower ends of the first prepreg layer 10-1. The requirement of fixing any laying angle of the first prepreg layer 10-1 is met.

[0037] Among them, the material clamping components in the two clamping components can be independently inserted and removed along the trapezoidal groove of the fixing plate, which greatly improves the experimental efficiency.

[0038] like Figure 5-Figure 8 As shown, V-shaped grooves are prefabricated on the upper and lower surfaces of the first material bonding plate 1-1-3-3. Correspondingly, V-shaped protrusions are prefabricated on the connecting surface of the first pressing plate 1-1-3-1. When the first pressing plate 1-1-3-1 is pressed, the first prepreg layer 10-1 can be spread along the V-shaped grooves, clamped more tightly, and not easily pulled off.

[0039] Similarly, the second clamping assembly 1-2 fixes the second prepreg layer 10-2 in the same manner as the first clamping assembly 1-1 fixes the first prepreg layer 10-1. The second clamping assembly 1-2 includes a second fixing plate, two second stoppers, and a second material clamping assembly. The second fixing plate is used to directly abut against the material clamping assembly 3 so that the first prepreg layer 10-2 and the third prepreg layer 10-3 fit together. Four second slideways are provided on the second fixing plate, and four guide rails 7 are passed through the second slideways so that the second clamping assembly 1-2 as a whole can slide along the guide rails 7 more smoothly.

[0040] The material clamping assembly 3 of the prepreg interface friction testing device for arbitrary fiber placement angle provided by the present invention. Fig. 9 and Fig.11 As shown, the material clamping assembly 3 includes a material clamping portion 3-1 and a connecting portion 3-2, wherein the material clamping portion 3-1 is used to fix the third prepreg layer 10-3, one end of the connecting portion 3-2 is fixedly connected to the material clamping portion 3-1, and the other end is fixedly connected to the universal testing machine joint 9-1, and the universal testing machine 9 applies a pulling force to the material clamping portion 3-1 in the opposite direction of gravity through the connecting portion 3-2, so that the third prepreg layer 10-3 clamped by the material clamping portion 3-1 slides longitudinally relative to the first prepreg layer 10-1 and the second prepreg layer 10-2.

[0041] Specifically, Fig.10As shown, the material clamping part 3-1 includes a material winding body 3-1-1 and two pressing plates 3-1-2. Fig.11 and Fig.12 As shown, the third prepreg layer 10-3 is wound on the material winding body 3-1-1, and two pressing plates 3-1-2 are connected from both sides of the material winding body 3-1-1 through bolts and nuts to press the third prepreg layer 10-3 on the material winding body 3-1-1.

[0042] The material winding body 3-1-1 includes an intermediate clamping plate and a material winding block. The intermediate clamping plate and the connecting portion 3-2 are located between the two pressing plates 3-1-2. The material winding block runs through the two pressing plates 3-1-2 and the connecting portion 3-2, and the two sides protrude outside the two pressing plates 3-1-2. The two side surfaces of the third prepreg layer 10 - 3 are respectively bonded to the first prepreg layer 10 - 1 and the second prepreg layer 10 - 2; The material winding block is a regular hexagon, as shown in the following figure: Fig.10 As shown in Figures a, b and c, the third prepreg layer 10-3 can be laid on any two opposite sides to meet the angle change.

[0043] The material winding blocks are two symmetrically distributed bosses, which can extend out of the mounting holes of the two pressing plates 3-1-2 respectively.

[0044] like Fig.12 As shown, the fixing method of the third prepreg layer 10-3 on the material clamping part 3-1 is clearly visible. The third prepreg layer 10-3 is covered on the surface of the material winding body 3-1-1 from top to bottom, and its two end parts are pressed on the two side surfaces of the material winding body 3-1-1 by two pressure plates 3-1-2 installed from the left and right of the material winding body 3-1-1. The material winding body 3-1-1 and the two pressure plates 3-1-1 are fastened with bolts, thereby achieving the clamping of the third prepreg 10-3, so that the third prepreg layer 10-3 is respectively attached to the two boss surfaces of the material winding block 3-1-1, so as to respectively fit with the first prepreg layer 10-1 and the second prepreg layer 10-2.

[0045] The prepreg friction testing method of the present invention comprises the following steps: The first prepreg layer 10-1 is fixed on the first material bonding plate 1-1-3-3 at the fiber laying angle required by the experiment, and the first pressing plate 1-1-3-1 and the first pressing sheet 1-1-3-2 are fixed on the first material bonding plate 1-1-3-3 by bolts to form a first material clamping assembly 1-1-3; In the same way, fix the second prepreg layer 10-2 to the second material bonding plate 1-2-3-3, and fix the second pressing plate 1-2-3-1 and the second pressing sheet 1-2-3-2 to the second material bonding plate 1-2-3-3 by bolts to form a second material clamping assembly 1-2-3; Prepare a plurality of first material clamping assemblies 1-1-3 and second material clamping assemblies 1-2-3 to respectively lay prepreg layers of angles required for the experiment.

[0046] The adjusting plate 2, the second fixing plate 1-2-1 and the first fixing plate 1-1-1 are installed on the guide rail in sequence from left to right, and then the first material clamping assembly 1-1-3 and the second material clamping assembly 1-2-3 are respectively inserted into the trapezoidal grooves of the first fixing plate 1-1-1 and the second fixing plate 1-2-1, and the first stopper 1-1-2 and the second stopper 1-2-2 are respectively fixed to the upper and lower ends of the first fixing plate 1-1-1 and the second fixing plate 1-2-1 with bolts, so that the first prepreg layer 10-1 and the second prepreg layer 10-2 are opposite to each other; The third prepreg layer 10-3 is fixed to the material clamping portion 3-1, and the material clamping portion 3-1 is fixedly connected to the connecting portion 3-2 to form a material clamping assembly 3; The fixed platform 4 and a section of the connecting portion 3-2 are respectively connected to the lower joint and the upper joint of the universal testing machine joint 9-1, and the material clamping component 3 is placed between the first clamping component 1-1 and the second clamping component 1-2.

[0047] Drive the micro cylinder 8 so that the driving end of the micro cylinder 8 pushes the first clamping assembly 1-1 and the second clamping assembly 1-2 to move toward each other along the guide rail 7, so as to clamp the material clamping assembly 3 in the middle, so that the third prepreg layer 10-3 is respectively attached to the first prepreg layer 10-1 and the second prepreg layer 10-2, and adjust the pneumatic pressure regulating valve so that the driving end of the micro cylinder 8 outputs a suitable thrust.

[0048] The environmental box 11 is slid along the slide rail 12 until the test device is completely placed in the environmental box 11 , and the temperature in the environmental box 11 is adjusted to reach the experimental conditions.

[0049] A universal testing machine 9 applies tension to the connection portion 3 - 2 to make the third prepreg layer 10 - 3 slide relative to the first prepreg layer 10 - 1 and the second prepreg layer 10 - 2 , and the tension value is read.

[0050] After the test is completed, the universal testing machine 9, the environmental chamber 11 and the air pump are turned off.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A device for testing the interface friction of prepregs with arbitrary fiber laying angles, characterized in that: include: A clamping assembly (1), the clamping assembly (1) comprising a first clamping assembly (1-1) and a second clamping assembly (1-2) which are symmetrically arranged, the first clamping assembly (1-1) being used to fix a first prepreg layer (10-1); The second clamping assembly (1-2) has the same structure as the first clamping assembly (1-1); The second clamping assembly (1-2) is used to fix the second prepreg layer (10-2); The first prepreg layer (10-1) and the second prepreg layer (10-2) are fixed along any fiber laying angle, and the lateral distance between the first clamping assembly (1-1) and the second clamping assembly (1-2) is adjustable; a third material clamping assembly (3), the third material clamping assembly (3) being used to clamp a third prepreg layer (10-3), the third material clamping assembly (3) being clamped between the first clamping assembly (1-1) and the second clamping assembly (1-2), and being able to slide relative to the first clamping assembly (1-1) and the second clamping assembly (1-2); The material clamping assembly (3) comprises a material clamping portion (3-1) and a connecting portion (3-2); The material clamping portion (3-1) comprises a material winding body (3-1-1) and a pressing plate (3-1-2), the third prepreg layer (10-3) is wrapped on the material winding body (3-1-1), and the pressing plate (3-1-2) is used to press the third prepreg layer (10-3) onto the material winding body (3-1-1); The material winding body (3-1-1) comprises an intermediate clamping plate and a material winding block, wherein the intermediate clamping plate and the connecting portion (3-2) are located between the two pressing plates (3-1-2); the material winding block penetrates the two pressing plates (3-1-2) and the connecting portion (3-2), and two sides protrude outside the two pressing plates (3-1-2), so that two side surfaces of the third prepreg layer (10-3) are respectively bonded to the first prepreg layer (10-1) and the second prepreg layer (10-2); The material winding block is a regular hexagon, and the third prepreg layer (10-3) can be laid on any two opposite sides to meet the angle change.

2. The device for testing interface friction of prepreg materials with arbitrary fiber laying angles according to claim 1, characterized in that: The first clamping assembly (1-1) comprises a first fixed plate (1-1-1), a first stopper (1-1-2) and a first material clamping assembly (1-1-3); the first fixed plate (1-1-1) is prefabricated with a groove; the first material clamping assembly (1-1-3) is embedded in the groove; the first stopper (1-1-2) is mounted at the upper and lower ends of the first fixed plate (1-1-1) to clamp the first material clamping assembly (1-1-3); The first material clamping assembly (1-1-3) comprises two first pressing plates (1-1-3-1), two first pressing sheets (1-1-3-2) and a first material bonding plate (1-1-3-3); the first prepreg layer (10-1) is wound on the first material bonding plate (1-1-3-3), and the two first pressing sheets (1-1-3-2) are used to press the left and right sides of the first prepreg layer (10-1); The two first pressing plates (1-1-3-1) are respectively installed at the upper and lower ends of the first material bonding plate (1-1-3-3), and the two first pressing plates (1-1-3-1) are respectively used to press the upper end and the lower end of the first prepreg layer (10-1).

3. The device for testing interface friction of prepreg materials with arbitrary fiber laying angles according to claim 2, characterized in that: The upper surface and the lower surface of the first material bonding plate (1-1-3-3) are both prefabricated with V-shaped grooves.

4. The device for testing interface friction of prepreg materials with arbitrary fiber laying angles according to claim 2, characterized in that: The components of the first clamping assembly (1-1) are connected by bolts; and the components of the first material clamping assembly (1-1-3) are connected by bolts.

5. The device for testing interface friction of prepreg materials with arbitrary fiber laying angles according to claim 1, characterized in that: One end of the connecting portion (3-2) is fixedly connected to the material clamping portion (3-1), and the other end is fixedly connected to the universal testing machine (9); The universal testing machine (9) applies a tensile force to the material clamping portion (3-1) via the connecting portion (3-2), thereby driving the material winding block to move.

6. The device for testing the interface friction of prepregs with arbitrary fiber laying angles according to any one of claims 1 to 5, characterized in that: It also comprises a fixed plate platform (4), a baffle (5) is arranged on the fixed platform (4), the baffle (5) comprises a first baffle (5-1) and a second baffle (5-2), and a bracket rod (6) is connected between the first baffle (5-1) and the second baffle (5-2).

7. The device for testing interface friction of prepreg materials with arbitrary fiber laying angles according to claim 6, characterized in that: A guide rail (7) is provided between the first baffle plate (5-1) and the second baffle plate (5-2), and the first clamping assembly (1-1) and the second clamping assembly (1-2) are slidably connected to the guide rail (7).

8. The device for testing interface friction of prepreg materials with arbitrary fiber laying angles according to claim 6, characterized in that: The device needs to cooperate with a micro cylinder (8) and the micro cylinder (8) is placed at the center of the first baffle (5-1), and the driving end of the micro cylinder (8) can abut against the first clamping assembly (1-1) to drive the first clamping assembly (1-1) to move along the guide rail (7); An adjustment sheet (2) is installed on the outer side of the second clamping assembly (1-2).

9. The device for testing interface friction of prepreg materials with arbitrary fiber laying angles according to claim 8, characterized in that: The arbitrary fiber laying angle prepreg interface friction test device is placed in an environmental box (11) to reach the temperature required for the experiment.

10. A test method for the interface friction test device for prepregs with arbitrary fiber laying angles according to any one of claims 1 to 9, characterized in that: The process includes: The first prepreg layer (10-1) is fixed on the first clamping component (1-1) according to the fiber laying angle required by the experiment; The second prepreg layer (10-2) is fixed on the second clamping component (1-2) according to the fiber laying angle required by the experiment; The first prepreg layer (10-1) and the second prepreg layer (10-2) are arranged opposite to each other; The third prepreg layer (10-3) is fixed to the material clamping portion (3-1), and the material clamping portion (3-1) is fixedly connected to the connecting portion (3-2) to form a material clamping assembly (3); the material clamping assembly (3) is placed between the first clamping assembly (1-1) and the second clamping assembly (1-2); Pushing the first clamping assembly (1-1) and the second clamping assembly (1-2) to move toward each other so as to clamp the material clamping assembly (3) in the middle, so that the third prepreg layer (10-3) is respectively bonded to the first prepreg layer (10-1) and the second prepreg layer (10-2); A tensile force is applied to the connection portion (3-2), so that the third prepreg layer (10-3) slides relative to the first prepreg layer (10-1) and the second prepreg layer (10-2), and the tensile force value is read.

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