An apparatus and method for testing the interfacial friction of randomly laid fiber angle prepreg

Abstract

The application belongs to the technical field of friction experiment equipment, and relates to a device and a method for testing the interface friction of a prepreg with an arbitrary fiber angle. The device comprises a first clamping assembly for fixing a first prepreg layer, a second clamping assembly for fixing a second prepreg layer, and a third material clamping assembly for clamping a third prepreg layer, the third material clamping assembly being 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 third prepreg layer is wrapped on the material winding body. 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 protrudes outside the two pressing plates on both sides. The material winding block is a regular hexagon, and the third prepreg layer is laid with any two opposite sides. The problems of complicated operation and low test efficiency in the prior art are solved.

Description

Technical Field

[0001] This invention belongs to the technical field of friction testing equipment, and particularly relates to a device and method for testing the interface friction of prepreg with arbitrary fiber laying angle. Background Technology

[0002] With the advancement of science and technology, composite materials are increasingly widely used in the aerospace field, especially technologies such as automated tape laying and automated fiber placement, which have seen rapid development and application due to their high molding efficiency and stable product quality. Friction is a crucial factor in the molding process of thin-walled composite components (automated layup, molding, stamping, etc.). Curved areas often experience impeded interlayer slippage of the prepreg due to friction, leading to defects such as wrinkles, which significantly affect the appearance and mechanical properties of the composite components. The prepreg preforming process involves friction between prepreg layers, between the prepreg and the mold, and between the prepreg and the vacuum bag film. Therefore, accurately understanding the friction during the prepreg preforming process of uncured prepreg is of guiding significance and important engineering value for evaluating defects in composite components during the molding process and for numerical simulation.

[0003] A search revealed that patent document CN111272647A discloses a prepreg friction testing device and method. However, the prepreg layer fixing method is complex, the testing procedure is cumbersome, and the testing efficiency is low, making it unsuitable for testing large numbers of samples. Furthermore, the environmental temperature of this prepreg friction testing device and method is difficult to control, especially in automated layup molding processes or other molding processes with high environmental requirements. Consequently, the accuracy of the experimental data characterizing the frictional slip properties of the prepreg is insufficient. Summary of the Invention

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

[0005] This invention is achieved through the following technical solution:

[0006] A device for testing interfacial friction of prepregs with arbitrary fiber lay-up angles, comprising:

[0007] A clamping assembly, comprising a first clamping assembly and a second clamping assembly symmetrically arranged, wherein the first clamping assembly is used to fix the first prepreg layer;

[0008] The second clamping assembly has the same structure as the first clamping assembly;

[0009] The second clamping assembly is used to secure the second prepreg layer;

[0010] The first prepreg layer and the second prepreg layer are fixed along any fiber laying angle, and the lateral distance between the first clamping assembly and the second clamping assembly is adjustable;

[0011] A third material clamping assembly is used to clamp a third prepreg layer. The third material clamping assembly is clamped between the first clamping assembly and the second clamping assembly and is slidable relative to the first clamping assembly and the second clamping assembly.

[0012] The material clamping assembly includes a material clamping part and a connecting part;

[0013] The material clamping part includes a material winding body and a pressure plate. The third prepreg layer is wrapped around the material winding body, and the pressure plate is used to press the third prepreg layer tightly onto the material winding body.

[0014] The material winding body includes an intermediate clamping plate and a material winding block. The intermediate clamping plate and the connecting part are located between two pressure plates. The material winding block passes through the two pressure plates and the connecting part, and protrudes from the outside of the two pressure plates on both sides, so that the two sides of the third prepreg layer are respectively attached to the first prepreg layer and the second prepreg layer.

[0015] 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 requirements.

[0016] Furthermore, the first clamping assembly includes a first fixing plate, a first stop block, and a first material clamping assembly. The first fixing plate has a pre-formed groove; the first material clamping assembly is embedded in the groove; the first stop block is installed at the upper and lower ends of the first fixing plate to clamp the first material clamping assembly.

[0017] The first material clamping assembly includes two first pressure plates, two first pressure sheets, and a first material bonding plate; a first prepreg layer is wound around the first material bonding plate, and the two first pressure sheets are used to press the left and right sides of the first prepreg layer;

[0018] Two first pressure plates are respectively installed at the upper and lower ends of the first material bonding plate, and the two first pressure plates are used to press the upper and lower ends of the first prepreg layer.

[0019] Furthermore, both the upper and lower surfaces of the first material bonding plate are pre-formed with V-grooves.

[0020] Furthermore, the components of the first clamping assembly are connected by bolts; the components of the first material clamping assembly are connected by bolts.

[0021] Furthermore, one end of the connecting part is fixedly connected to the material clamping part, and the other end is fixedly connected to the universal testing machine;

[0022] The universal testing machine applies a pulling force to the material clamping part through the connecting part, thereby moving the material winding block.

[0023] Furthermore, it also includes a fixed plate platform, on which a baffle is provided. The baffle includes a first baffle and a second baffle, and a support rod is connected between the first baffle and the second baffle.

[0024] Furthermore, a guide rail is provided between the first baffle and the second baffle, and the first clamping assembly and the second clamping assembly are slidably connected to the guide rail.

[0025] Furthermore, the device requires a miniature cylinder, which is placed at the center of the first baffle. The driving end of the miniature cylinder can abut against the first clamping assembly to drive the first clamping assembly to move along the guide rail.

[0026] An adjustment tab is installed on the outside of the second clamping assembly.

[0027] Furthermore, the prepreg interface friction testing device with arbitrary fiber laying angle is placed in an environmental chamber to reach the required experimental temperature.

[0028] This invention also discloses a test method based on the aforementioned prepreg interfacial friction test device with arbitrary fiber layup angle, comprising the following steps:

[0029] The first prepreg layer is fixed to the first clamping assembly according to the fiber laying angle required for the experiment.

[0030] The second prepreg layer is fixed to the second clamping assembly according to the fiber laying angle required for the experiment.

[0031] The first prepreg layer and the second prepreg layer are positioned opposite each other;

[0032] The third prepreg layer is fixed to the material clamping part, and the material clamping part is fixedly connected to the connecting part to form a material clamping assembly; the material clamping assembly is placed between the first clamping assembly and the second clamping assembly.

[0033] The first clamping assembly and the second clamping assembly are pushed to move toward each other so as to clamp the material clamping assembly in the middle, so that the third prepreg layer is respectively attached to the first prepreg layer and the second prepreg layer;

[0034] A tensile force is applied to the connecting portion, causing the third prepreg layer to slide relative to the first and second prepreg layers, and the tensile force value is read.

[0035] Compared with the prior art, the present invention has the following beneficial technical effects:

[0036] This invention provides a device for testing interfacial friction of prepreg at arbitrary lay-up angles, comprising a first clamping assembly, a second clamping assembly, and a third material holding assembly. The third material holding assembly is clamped between the first and second clamping assemblies and is slidable relative to them. The first clamping assembly holds a first prepreg layer, the second clamping assembly fixes a second prepreg layer, and the third material holding assembly holds a third prepreg layer. The material holding assembly is specifically designed, comprising a material winding body and pressure plates. The material winding body includes a middle clamping plate and a material winding block, with the middle clamping plate and connecting portion located between the two pressure plates. The material winding block passes through the two pressure plates and the connecting portion, protruding on both sides outside the two pressure plates, ensuring that the two sides of the third prepreg layer are respectively in contact with the first and second prepreg layers. The material winding block is hexagonal, allowing the third prepreg layer to be laid with any two opposite sides to accommodate angle variations. The polygonal design of the material winding block enables multi-angle relative friction testing. The testing device designed in this invention has a wide range of applications, enabling the simultaneous determination of the friction coefficient between prepreg layers and between the prepreg and the layup interface under different temperatures, pressures, relative speeds, and arbitrary orientations. It simplifies experimental operations and improves testing efficiency while ensuring reliable fixation of the prepreg layers. It also enables friction testing of the prepreg layers at arbitrary angles, avoiding the influence of the experimental environment on the friction coefficient.

[0037] Furthermore, both the first and second clamping components of this invention are detachably connected. Specifically, the material clamping component is embedded as a modular unit within the fixed plate. This allows for rapid replacement of the material clamping component after each experiment without disassembling the fixed plate, reducing replacement and installation time and significantly improving experimental efficiency. Traditional testing devices typically require at least two people and a considerable amount of time to change components before the next experiment can proceed.

[0038] Furthermore, this invention also includes an environmental chamber where the interfacial friction testing device for prepregs with arbitrary fiber angles is placed to achieve the required experimental temperature. This ensures uniform temperature, unlike previous methods that involved adding heating elements to a fixed plate, resulting in a complex friction testing device structure, uneven temperature distribution, and inaccurate measurement accuracy. Attached Figure Description

[0039] Figure 1 This is an assembly diagram of the prepreg interface friction testing device with arbitrary laying angle provided in this invention, combined with a universal testing machine and an environmental chamber.

[0040] Figure 2 This is a schematic diagram of the interface friction testing device for prepregs at arbitrary laying angles provided in this invention.

[0041] Figure 3 This is a schematic diagram of the first clamping component of the prepreg interface friction testing device with arbitrary laying angle provided in this invention.

[0042] Figure 4 This is a schematic diagram showing the positional relationship of each part of the first clamping component of the prepreg interface friction testing device with arbitrary laying angle provided in this invention example.

[0043] Figure 5 This is a schematic diagram of the first material clamping component of the prepreg interface friction testing device with arbitrary laying angle provided in this invention.

[0044] Figure 6 This is a front view of the first material clamping assembly of the prepreg interface friction testing device with arbitrary laying angle provided in this invention example.

[0045] Figure 7 yes Figure 6 A partial sectional view along the AA direction;

[0046] Figure 8 yes Figure 6 A partial sectional view along the BB direction;

[0047] Figure 9 This is a schematic diagram of the third material clamping component of the prepreg interface friction testing device with arbitrary laying angle provided in this invention.

[0048] Figure 10 This is a partial schematic diagram of the third material clamping component of the prepreg interface friction testing device with arbitrary laying angle provided in this invention, including three different clamping angles of the third prepreg.

[0049] Figure 11 This is a front view of the third material clamping component of the prepreg interface friction testing device with arbitrary laying angle provided in this invention embodiment;

[0050] Figure 12 This is a schematic diagram of the material winding of the third material clamping component of the prepreg interface friction testing device with arbitrary laying angle provided in this invention.

[0051] In the picture:

[0052] 1. Clamping assembly; 1-1. First clamping assembly; 1-1-1. First fixing plate; 1-1-1-1. First slide rail; 1-1-2. First stop block; 1-1-3. First material clamping assembly;

[0053] 1-1-3-1, First pressure plate; 1-1-3-2, First pressing plate; 1-1-3-3, First material bonding plate;

[0054] 2. Adjusting plate; 3. Third material clamping assembly; 3-1. Material clamping part; 3-1-1. Material winding body; 3-1-2. Pressure plate; 3-2. Connecting part;

[0055] 4. Fixed platform; 5-1. First baffle; 5-2. Second baffle; 6. Support rod; 7. Guide rail; 8. Miniature cylinder;

[0056] 9. Universal testing machine; 9-1. Universal testing machine connector; 9-2. Tensile sensor;

[0057] 10-1, First prepreg layer; 10-2, Second prepreg layer; 10-3, Third prepreg layer;

[0058] 11. Environmental chamber; 12. Slide rail. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the present invention clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; that is, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0060] The components described and illustrated in the accompanying drawings and embodiments of this invention can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely to illustrate one selected embodiment of the invention. All other embodiments obtained by those skilled in the art based on the accompanying drawings and embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0061] It should be noted that the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that a process, element, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to the process, element, method, article, or apparatus. Furthermore, the terms "horizontal" and "vertical" are based on the orientation and positional relationship of the devices or components shown in the accompanying drawings and are used only for better description of the invention, not to require that the shown devices, components, or apparatus must have that specific orientation, and therefore should not be construed as limiting the invention.

[0062] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0063] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0064] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0065] like Figure 2 As shown, the prepreg interface friction testing device with arbitrary layup angle provided by the present invention includes a clamping assembly 1 and a material clamping assembly 3. The clamping assembly 1 includes a first clamping assembly 1-1 and a second clamping assembly 1-2 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.

[0066] Specifically, such as Figure 1 As shown, the prepreg interface friction testing device with arbitrary layup 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 connector 9 to ensure the stability of the fixed platform 4. Baffles are fixedly installed at both ends of the upper surface of the fixed platform 4. The baffles include a first baffle 5-1 and a second baffle 5-2, which are respectively fixed to both ends of the upper surface of the fixed platform 4. Two support rods 6 connect the upper ends of the first baffle 5-1 and the second baffle 5-2 to ensure that the device has sufficient rigidity.

[0067] Furthermore, a guide rail 7 is provided between the first baffle 5-1 and the second baffle 5-2. One end of the guide rail 7 has a larger diameter than the second baffle 5-2, and the larger diameter end of the guide rail 7 is fixed to one side of the second baffle 5-2. The guide rail 5 serves as a sliding track for the first clamping assembly 1-1, the second clamping assembly 1-2, and the adjusting plate 2. The number of guide rails 5 is set to four, which can ensure the rigidity and smooth sliding of the device. The adjusting plate 2 is mainly used to adjust the lateral position of the second clamping assembly 1-2, ensuring that the two sides 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.

[0068] The arbitrary lay-up angle prepreg interface friction testing device provided in this example also includes a miniature cylinder 8 (different cylinder models can be selected according to the pressure; for high pressure, a hydraulic jack can be selected). The thrust of the miniature cylinder is mainly determined by the pressure regulating valve, which is connected between the air pump and the miniature cylinder 8 through an 8mm diameter air pipe. The miniature cylinder 8 is used to drive the first clamping assembly 1-1, the second clamping assembly 1-2, and the adjusting plate 2 to move, thereby providing clamping force to the material clamping assembly 3, which 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 abuts against 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 adjusting plate 2 to slide along the guide rail, so that one side of the adjusting plate 2 is tightly fitted with one side of the second baffle 5-2, and the other side of the adjusting plate 2 is tightly fitted with the second clamping assembly 1-2. The first clamping assembly 1-1 and the second clamping assembly 1-2 clamp the material clamping assembly 3. In this embodiment, the pressure variation range of the output of the micro cylinder is from 0 MPa to 1 MPa.

[0069] Since the first clamping assembly 1-1 and the second clamping assembly 1-2 have the same structure, this example will use the first clamping assembly 1-1 as an example for explanation. Figures 3-6 As shown, the first clamping assembly 1-1 includes a first fixing plate 1-1-1, two first stops 1-1-2, and a first material clamping assembly 1-1-3.

[0070] The first fixing plate 1-1-1 has a dovetail groove, and the first material clamping component 1-1-3 is embedded in the dovetail groove.

[0071] 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 in contact.

[0072] like Figure 4 As shown, the first fixed plate 1-1-1 is provided with four first slides 1-1-1-1, and four guide rails 7 are inserted in the first slides 1-1-1-1 to make the sliding of the first clamping assembly 1-1 along the guide rails 7 more stable.

[0073] In addition, such as Figures 5-8As shown, the first material clamping assembly 1-1-3 includes two first pressure plates 1-1-3-1, two first pressure sheets 1-1-3-2, and a first material bonding plate 1-1-3-3. A first prepreg layer 10-1 is wound around the first material bonding plate 1-1-3-3. The two first pressure sheets 1-1-3-2 are used to press the left and right sides of the first prepreg layer 10-1. The two first pressure 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 are used to press the upper and lower ends of the first prepreg layer 10-1. This satisfies the requirement of fixing the angle of any laying of the first prepreg layer 10-1.

[0074] Among them, the material clamping components in the two clamping assemblies can be independently inserted and removed along the trapezoidal groove of the fixed plate, which greatly improves the experimental efficiency.

[0075] like Figures 5-8 As shown, V-grooves are pre-formed on both the upper and lower surfaces of the first material bonding plate 1-1-3-3. Correspondingly, V-shaped protrusions are pre-formed on the connecting surface of the first pressure plate 1-1-3-1. When the first pressure plate 1-1-3-1 is pressed tightly, the first prepreg layer 10-1 can spread along the V-grooves, be clamped more tightly, and is not easily pulled off.

[0076] Similarly, the second clamping assembly 1-2 fixes the second prepreg layer 10-2 in the same way 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 stops, 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 are in contact. The second fixing plate is provided with four second slides, and four guide rails 7 pass through the second slides to make the sliding of the second clamping assembly 1-2 along the guide rails 7 more stable.

[0077] The material clamping component 3 of the prepreg interface friction testing device with arbitrary fiber laying angle provided by the present invention. For example... Figure 9 and Figure 11 As shown, the material clamping assembly 3 includes a material clamping part 3-1 and a connecting part 3-2. The material clamping part 3-1 is used to fix the third prepreg layer 10-3. One end of the connecting part 3-2 is fixedly connected to the material clamping part 3-1, and the other end is fixedly connected to the universal testing machine connector 9-1. The universal testing machine 9 applies a pulling force to the material clamping part 3-1 in the opposite direction of gravity through the connecting part 3-2, so that the third prepreg layer 10-3 clamped by the material clamping part 3-1 slides longitudinally relative to the first prepreg layer 10-1 and the second prepreg layer 10-2.

[0078] Specifically, such as Figure 10As shown, the material clamping part 3-1 includes a material winding body 3-1-1 and two pressure plates 3-1-2, as... Figure 11 and Figure 12 As shown, the third prepreg layer 10-3 is wound on the material winding body 3-1-1, and two pressure plates 3-1-2 are connected from both sides of the material winding body 3-1-1 by bolts and nuts to press the third prepreg layer 10-3 onto the material winding body 3-1-1.

[0079] The material winding body 3-1-1 includes an intermediate clamping plate and a material winding block. The intermediate clamping plate and the connecting part 3-2 are located between two pressure plates 3-1-2. The material winding block passes through the two pressure plates 3-1-2 and the connecting part 3-2, and protrudes on both sides outside the two pressure plates 3-1-2.

[0080] This allows the two sides of the third prepreg layer 10-3 to be bonded to the first prepreg layer 10-1 and the second prepreg layer 10-2, respectively.

[0081] The material winding block is a regular hexagon, specifically as follows: Figure 10 As shown in Figures a, b, and c, the third prepreg layer 10-3 can be laid with any two opposite sides to satisfy angle changes.

[0082] The material winding block consists of two symmetrically distributed bosses that can extend out of the mounting holes of the two pressure plates 3-1-2 respectively.

[0083] like Figure 12 As shown, the fixing method of the third prepreg layer 10-3 in the material clamping part 3-1 is clearly visible. The third prepreg layer 10-3 covers the surface of the material winding body 3-1-1 from top to bottom. Its two ends are pressed against the two sides of the material winding body 3-1-1 by two pressure plates 3-1-2 installed from the left and right sides of the material winding body 3-1-1. The material winding body 3-1-1 is fastened to the two pressure plates 3-1-1 with bolts, thereby achieving the clamping of the third prepreg 10-3. This allows the third prepreg layer 10-3 to adhere to the two boss surfaces of the material winding block 3-1-1, so as to adhere to the first prepreg layer 10-1 and the second prepreg layer 10-2 respectively.

[0084] The prepreg friction test method of the present invention includes the following steps:

[0085] The first prepreg layer 10-1 is fixed on the first material bonding plate 1-1-3-3 according to the fiber laying angle required for the experiment. The first pressure plate 1-1-3-1 and the first pressure sheet 1-1-3-2 are fixed on the first material bonding plate 1-1-3-3 with bolts to form the first material clamping assembly 1-1-3.

[0086] The second prepreg layer 10-2 is fixed to the second material bonding plate 1-2-3-3 using the same method. The second pressure plate 1-2-3-1 and the second pressure sheet 1-2-3-2 are fixed to the second material bonding plate 1-2-3-3 with bolts to form the second material clamping assembly 1-2-3.

[0087] Prepare multiple first material clamping components 1-1-3 and second material clamping components 1-2-3, and lay prepreg layers at the required angles for the experiment.

[0088] Install the adjusting plate 2, the second fixing plate 1-2-1 and the first fixing plate 1-1-1 on the guide rail in sequence from left to right. Then, insert the first material clamping assembly 1-1-3 and the second material clamping assembly 1-2-3 into the trapezoidal grooves of the first fixing plate 1-1-1 and the second fixing plate 1-2-1 respectively. Fix the first stop block 1-1-2 and the second stop block 1-2-2 to the upper and lower ends of the first fixing plate 1-1-1 and the second fixing plate 1-2-1 respectively with bolts, so that the first prepreg layer 10-1 and the second prepreg layer 10-2 are opposite to each other.

[0089] The third prepreg layer 10-3 is fixed to the material clamping part 3-1, and the material clamping part 3-1 is fixedly connected to the connecting part 3-2 to form the material clamping assembly 3;

[0090] The fixed platform 4 and the connecting part 3-2 are respectively connected to the lower and upper connectors of the universal testing machine connector 9-1, and the material clamping assembly 3 is placed between the first clamping assembly 1-1 and the second clamping assembly 1-2.

[0091] 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 towards 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 in contact with the first prepreg layer 10-1 and the second prepreg layer 10-2 respectively. Adjust the pneumatic pressure regulating valve so that the driving end of the micro cylinder 8 outputs a suitable thrust.

[0092] Slide the environmental chamber 11 along the slide rail 12 until the test device is completely placed inside the environmental chamber 11, and adjust the temperature inside the environmental chamber 11 to meet the experimental conditions.

[0093] The universal testing machine 9 applies a tensile force to the connecting part 3-2, causing the third prepreg layer 10-3 to slide relative to the first prepreg layer 10-1 and the second prepreg layer 10-2, and the tensile force value is read.

[0094] After the test is completed, turn off the universal testing machine 9, the environmental chamber 11 and the air pump.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do 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. An arbitrary layup fiber angle prepreg interfacial friction testing device, characterized by, The application relates to a material clamping assembly for a prepreg laying machine. The material clamping assembly comprises a first clamping assembly (1-1) and a second clamping assembly (1-2) which are symmetrically arranged, the first clamping assembly (1-1) is used for fixing a first prepreg layer (10-1), the second clamping assembly (1-2) is identical in structure with the first clamping assembly (1-1), the second clamping assembly (1-2) is used for fixing a second prepreg layer (10-2), the first prepreg layer (10-1) and the second prepreg layer (10-2) are fixed along an arbitrary laying fiber angle, the transverse distance between the first clamping assembly (1-1) and the second clamping assembly (1-2) is adjustable, a third material clamping assembly (3) is used for clamping a third prepreg layer (10-3), the third material clamping assembly (3) is clamped between the first clamping assembly (1-1) and the second clamping assembly (1-2) and can 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 part (3-1) and a connecting part (3-2), the material clamping part (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 for pressing the third prepreg layer (10-3) on the material winding body (3-1-1), the material winding body (3-1-1) comprises a middle clamping plate and a material winding block, the middle clamping plate is located between the two pressing plates (3-1-2) and the connecting part (3-2), the material winding block penetrates through the two pressing plates (3-1-2) and the connecting part (3-2) and protrudes outside the two pressing plates (3-1-2) on two sides, so that the two side surfaces of the third prepreg layer (10-3) are respectively attached to the first prepreg layer (10-1) and the second prepreg layer (10-2), the material winding block is a regular hexagon, the third prepreg layer (10-3) can be laid along any two opposite sides, and the angle change is met, 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 provided with a recess, the first material clamping assembly (1-1-3) is inlaid in the recess, and the first stopper (1-1-2) is installed 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 attaching plate (1-1-3-3), the first prepreg layer (10-1) is wound on the first material attaching plate (1-1-3-3), and the two first pressing sheets (1-1-3-2) are used for pressing the first prepreg layer (10-1) on the left and right sides. ​ ​ ​ ​ ​ ​ ​ ​ 2. The arbitrary layup fiber angle prepreg interfacial friction test device of claim 1, wherein, ​ ​ Two first pressing plates (1-1-3-1) are respectively arranged at upper and lower ends of the first material adhering plate (1-1-3-3), and the two first pressing plates (1-1-3-1) are respectively used for pressing the upper end and the lower end of the first prepreg layer (10-1).

3. The arbitrary layup fiber angle prepreg interfacial friction test device of claim 2, wherein, The upper surface and the lower surface of the first material adhering plate (1-1-3-3) are both preformed with V-shaped grooves.

4. The arbitrary layup fiber angle prepreg interfacial friction test device of claim 2, wherein, The elements of the first clamping assembly (1-1) are connected by bolts; the elements of the first material clamping assembly (1-1-3) are connected by bolts.

5. The arbitrary layup fiber angle prepreg interfacial friction test device of claim 1, wherein, One end of the connecting part (3-2) is fixedly connected with the material clamping part (3-1), and the other end is fixedly connected with the universal testing machine (9); The universal testing machine (9) applies tension to the material clamping part (3-1) through the connecting part (3-2), so as to move the material winding block.

6. An arbitrary layup fiber angle prepreg interfacial friction test device according to any one of claims 1-5, wherein, It also includes a fixed sheet platform (4), the fixed platform (4) is provided with a baffle (5), the baffle (5) includes a first baffle (5-1) and a second baffle (5-2), and a support rod (6) is connected between the first baffle (5-1) and the second baffle (5-2).

7. The arbitrary layup fiber angle prepreg interfacial friction test device of claim 6, wherein, The first baffle (5-1) and the second baffle (5-2) are provided with a guide rail (7), and the first clamping assembly (1-1) and the second clamping assembly (1-2) are slidably connected with the guide rail (7).

8. The arbitrary layup fiber angle prepreg interfacial friction test device of claim 7, wherein, The device needs to cooperate with a micro air cylinder (8), the micro air cylinder (8) is placed at the center position of the first baffle (5-1), the driving end of the micro air cylinder (8) can abut against the first clamping assembly (1-1), and is used for driving the first clamping assembly (1-1) to move along the guide rail (7); An adjusting sheet (2) is arranged outside the second clamping assembly (1-2).

9. The arbitrary layup fiber angle prepreg interfacial friction test device of claim 8, wherein, The arbitrary laying fiber angle prepreg interface friction testing device is placed in an environmental box (11), and the required temperature for the experiment is reached.

10. A test method for any laid fiber angle prepreg interfacial friction test apparatus according to any one of claims 1 to 9, characterized in that, The following processes are included: The first prepreg layer (10-1) is fixed on the first clamping assembly (1-1) according to the required laying fiber angle for the experiment; The second prepreg layer (10-2) is fixed on the second clamping assembly (1-2) according to the required laying fiber angle for the experiment; 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 on the material clamping part (3-1), the material clamping part (3-1) is fixedly connected with the connecting part (3-2) to form a material clamping assembly (3); and the material clamping assembly (3) is placed between the first clamping assembly (1-1) and the second clamping assembly (1-2); The first clamping assembly (1-1) and the second clamping assembly (1-2) are pushed to move towards each other, so as to clamp the material clamping assembly (3) in the middle, and the third prepreg layer (10-3) is adhered to the first prepreg layer (10-1) and the second prepreg layer (10-2) respectively. A pulling force is applied 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 pulling force value is read.

Images