Clamp for testing wedge-shaped peel strength of carbon fiber composite material laminated plate

Abstract

The invention belongs to the technical field of composite material detection equipment, and particularly discloses a carbon fiber composite material laminated plate wedge-shaped peel strength test fixture, which is arranged between an upper arm and a lower arm of a universal testing machine, and comprises a fixture assembly and a peel upper pulling assembly arranged above the fixture assembly, and the clamp assembly and the stripping and upward pulling assembly are respectively arranged on a lower arm and an upper arm of the universal testing machine. According to the wedge-shaped peel strength testing clamp for the carbon fiber composite material laminated plate, the asymmetric load in the test loading process can be automatically balanced by arranging one rotational degree of freedom of the left pressing piece and the right pressing piece. Meanwhile, the distance between the left pressing piece and the right pressing piece can be adjusted according to test requirements so as to adapt to test pieces with different lengths. In addition, the clamp is simple in structure and convenient to install and use.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material testing equipment, in particular to a wedge-shaped peeling strength testing fixture for carbon fiber composite material laminates. Background Art

[0002] Carbon fiber composites are an advanced composite material composed of carbon fiber reinforcement and a resin matrix (such as epoxy resin). They have high specific strength, high specific modulus, excellent fatigue performance and corrosion resistance, and are widely used in aerospace, automobiles, high-end sports equipment and other fields. Carbon fiber composites are usually made of a laminated structure, that is, multiple layers of fiber plies are stacked in a specific direction and sequence, and cured by hot pressing or other processes to form a laminate. Although they have excellent in-plane mechanical properties, their strength and toughness in the interlayer direction (i.e., thickness direction) are relatively weak, and they are prone to failure between layers, especially under impact or combined loads.

[0003] In practical applications, composite structures are often faced with complex loads, such as shear, bending or impact. These loads can easily trigger the initiation and expansion of interlaminar cracks, ultimately leading to overall failure of the structure. Therefore, accurately evaluating the bond strength and fracture toughness of the interlaminar interface is a key issue in the design and reliability assessment of composite structures. The interlaminar debonding test of carbon fiber composite laminates is an experimental method commonly used to study the interlaminar interface strength and fracture properties of composite materials. In traditional interlaminar debonding tests of carbon fiber composite laminates, the samples cannot be clamped accurately and evenly, resulting in asymmetric loads between layers, which may cause unexpected crack expansion and make it difficult to guarantee the experimental results.

[0004] Chinese utility model patent CN218496728U discloses a special fixture for a peel strength tester, comprising an upper fixture and a lower fixture, for testing composite materials, wherein the composite materials include mutually bonded sheets and a base layer. The lower fixture comprises a left plate, a first upper plate, a first bolt, a second bolt, a second upper plate, a right plate, a carrier plate, and a docking member. The carrier plate is connected to a slide rail on the lower surface, on which a first slider is slidably connected, and a horizontally arranged bottom plate is connected to the first slider. One end of the bottom plate is vertically connected to a vertical plate, and a pressure cylinder is slidably connected to the side of the vertical plate, which presses on the composite material. The other end of the bottom plate is connected to a rotating shaft, on which a pulley is rotatably connected. The left plate is fixedly connected to a pin, and a steel wire rope is tied to the pin. The free end of the steel wire rope passes through the pulley and is connected to the upper fixture. The pressure cylinder always presses against the side of the constantly changing peeling position to prevent bending and deformation of the composite material, thereby more accurately testing the peel strength. However, the disadvantage of this fixture is that the sheet is pulled upward by the upper fixture, causing the sheet to be gradually peeled off from one end of the composite material to the other. During the peeling process, asymmetric loads are easily generated between the layers, affecting the experimental results.

[0005] There are two methods for the existing carbon fiber composite wedge peeling test: Figure 1 As shown, when manufacturing the first laminate 60 sample, a first separator film 601 is placed between the layers in the middle of the length of the first laminate 60 to separate the upper and lower layers. This prevents the area where the separator film 601 is placed from bonding together, creating an initial crack for the placement of the first wedge 602. A universal testing machine is used to clamp the first laminate 60 and the first wedge 602 and apply tensile loading from left to right to determine the relationship between the crack propagation length and the peeling force. A disadvantage of this method is that the placement of the first separator film 601 to create the initial crack creates a length difference dl between the upper and lower layers at the location of the initial crack due to the thickness of the first separator film 601. This can cause asymmetric loading between the layers during loading in the testing machine, causing the crack to propagate to other layers and affect the experimental results.

[0006] In the second method, if Figure 2 As shown, a second separator film 701 is placed at one end of the second laminate 70 specimen, rather than in the middle. This creates an initial crack at one end. During testing, the separated upper and lower layers are clamped separately to avoid the effect of the length difference dl caused by the second separator film 701. A second wedge 702 is placed between the separated upper and lower layers. A universal testing machine is used to clamp the second laminate 70 and the second wedge 702 and apply tensile loading from left to right. This method provides a relationship between crack propagation length and peel force. A disadvantage of this method is that since the separated upper and lower layers are clamped separately, uneven clamping can also produce length errors between the upper and lower layers, resulting in asymmetric loading and unintended crack propagation.

[0007] In summary, the existing carbon fiber composite wedge-shaped peeling fixture cannot automatically balance the peeling force on the upper and lower layers, resulting in unexpected crack expansion and affecting the experimental results. Summary of the Invention

[0008] The present invention provides a wedge-shaped peel strength testing fixture for carbon fiber composite laminates, which can solve the problem in the prior art that the wedge-shaped peeling fixture for carbon fiber composite materials cannot automatically balance the peeling force exerted on the upper and lower layers, resulting in unexpected crack expansion and thus affecting the experimental results.

[0009] A wedge-shaped peel strength test fixture for carbon fiber composite laminates is installed between the upper arm and lower arm of a universal testing machine, and includes a fixture assembly and a peeling upper pull component installed above the fixture assembly. The fixture assembly and the peeling upper pull component are respectively installed on the lower arm and upper arm of the universal testing machine;

[0010] The fixture assembly includes two slide rails, two pressing members, and a guide assembly. The two slide rails are arranged opposite to each other, the two pressing members are arranged on the slide rails, and the guide assembly is arranged between the two pressing members and installed on the slide rails.

[0011] The guide assembly includes a double-ended stepped stud, a base sleeved on the outside of the double-ended stepped stud, and two bearings. The left and right sides of the base are both provided with mounting grooves. The two bearings are sleeved on the outside of the double-ended stepped stud and respectively arranged in the two mounting grooves. The two ends of the double-ended stepped stud are respectively arranged on the two slide rails.

[0012] A lower clamping rod is provided at the bottom of the base;

[0013] The peeling upper pulling assembly comprises a pulling frame and a wedge arranged in the pulling frame, and an upper clamping rod is arranged on the top of the pulling frame.

[0014] Furthermore, both ends of the double-ended stepped stud are provided with external threads, and a nut matching the external threads is mounted on the double-ended stepped stud;

[0015] The slide rail is provided with a mounting hole adapted to fit the double-headed stepped stud;

[0016] Both ends of the double-headed stepped stud are respectively fixed in the mounting holes on the slide rail by two nuts.

[0017] Furthermore, the peeling and pulling assembly is located directly above the base.

[0018] Furthermore, the two pressing members are symmetrical with respect to the guide assembly.

[0019] Furthermore, the pressing member includes a slider and a pressing block provided on the top of the slider, and the pressing block is fixed to the slider by bolts;

[0020] The sliding block is fixed on the sliding rail by means of bolts.

[0021] Furthermore, a pressing groove is provided on the top of the sliding block, and a pressing protrusion that matches the pressing groove is provided on the lower bottom surface of the pressing block.

[0022] Furthermore, the pulling frame includes an upper pull rod connecting block and upper pull rods provided at both ends of the upper pull rod connecting block, and the upper pull rods are perpendicular to the upper pull rod connecting block;

[0023] The upper clamping rod is arranged on the top of the upper pull rod connecting block;

[0024] The wedge is arranged between the two upper pull rods.

[0025] Furthermore, the upper pull rod is fixed to the upper pull rod connecting block by bolts.

[0026] Furthermore, the wedge is fixed between the two upper pull rods by bolts.

[0027] Furthermore, the wedge is a conical structure;

[0028] One end of the wedge is a tip portion, and the other end of the wedge is a mounting portion;

[0029] The tip portion is arranged toward the upper pull rod connecting block.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention provides a wedge-peel strength testing fixture for carbon fiber composite laminates. By providing a rotational degree of freedom between left and right clamping members, it can automatically balance asymmetric loads during test loading. Furthermore, the distance between the left and right clamping members can be adjusted to accommodate specimens of varying lengths. Furthermore, the fixture has a simple structure and is easy to install and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0033] Figure 1 A schematic diagram of the first peeling process in the existing carbon fiber composite material wedge peeling test in the background technology provided by the present invention;

[0034] Figure 2 A schematic diagram of the second peeling process in the existing carbon fiber composite material wedge peeling test in the background technology provided by the present invention;

[0035] Figure 3 A schematic structural diagram of a wedge-shaped peel strength test fixture for carbon fiber composite laminates provided by the present invention;

[0036] Figure 4 An exploded view of the structure of the fixture assembly of a wedge-shaped peel strength test fixture for carbon fiber composite laminates provided by the present invention;

[0037] Figure 5 A schematic structural diagram of a double-ended stepped stud of a wedge-shaped peel strength test fixture for carbon fiber composite laminates provided by the present invention;

[0038] Figure 6 A schematic diagram of the partial structure of a wedge-shaped peel strength test fixture for carbon fiber composite laminates provided by the present invention;

[0039] Figure 7A schematic diagram of the installation structure of a slider and a pressing block of a wedge-shaped peel strength test fixture for carbon fiber composite laminates provided by the present invention;

[0040] Figure 8 This is a structural exploded diagram of the peeling and pulling assembly of a wedge-shaped peel strength testing fixture for carbon fiber composite laminates provided by the present invention.

[0041] Explanation of the reference numerals: 100, clamp assembly; 200, peeling upper pulling assembly; 300, pressing member; 400, guide assembly; 1, slide rail; 3, slider; 4, pressing block; 7, base; 8, bearing; 9, nut; 10, double-headed stepped stud; 11, lower clamping rod; 16, upper clamping rod; 17, upper pull rod connecting block; 19, upper pull rod; 21, wedge; 22, tip; 23, mounting portion; 32, clamping groove; 33, second bolt; 41, clamping protrusion; 42, first bolt; 71, mounting groove; 101, mounting hole; 102, intermediate connecting shaft; 103, threaded rod; 191, third bolt; 192, fourth bolt; 201, pulling frame. DETAILED DESCRIPTION

[0042] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0043] like Figures 1 to 6 As shown, the present invention provides a wedge-shaped peel strength test fixture for carbon fiber composite laminates, which is arranged between the upper arm and the lower arm of a universal testing machine, and includes a fixture assembly 100 and a peeling upper pulling component 200 arranged above the fixture assembly. The fixture assembly 100 and the peeling upper pulling component 200 are respectively arranged on the lower arm and the upper arm of the universal testing machine;

[0044] Specifically, the universal testing machine, also called the universal material testing machine, or the tensile testing machine, is a double-screw series with an integrated control, measurement, and operation structure, integrating contemporary advanced technologies, and having the advantages of high precision, wide speed regulation range, compact structure, convenient operation, and stable performance. In the present invention, the universal testing machine is a conventional universal testing machine with an upper arm and a lower arm. The present invention provides a wedge-shaped peel strength test fixture for carbon fiber composite laminates, which is composed of a fixture assembly 100 and a peeling upper pulling component 200, and the fixture assembly 100 and the peeling upper pulling component 200 are respectively installed on the lower arm and the upper arm of the universal testing machine, and the relative movement of the upper and lower arms of the universal testing machine is used to generate tensile force, thereby ensuring the conduct of the peel strength test;

[0045] The fixture assembly 100 includes two slide rails 1, two pressing members 300, and a guide assembly 400. The two slide rails 1 are arranged opposite to each other, the two pressing members 300 are arranged on the slide rails 1, and the guide assembly 400 is arranged between the two pressing members 300 and installed on the slide rails 1.

[0046] Specifically, two slide rails 1 form a sliding track, two pressing members 300 are slidably disposed on the sliding track, and the pressing members 300 can be fastened to the slide rails 1 by bolts; and the guide assembly is disposed between the two slide rails 1, and the guide assembly 400 is located between the two pressing members 300;

[0047] The guide assembly 400 includes a double-ended stepped stud 10, a base 7 sleeved on the outside of the double-ended stepped stud 10, and two bearings 8. The left and right sides of the base 7 are each provided with a mounting groove 71. The two bearings 8 are sleeved on the outside of the double-ended stepped stud 10 and respectively disposed in the two mounting grooves 71. The two ends of the double-ended stepped stud 10 are respectively disposed on the two slide rails 1.

[0048] In addition, a lower clamping rod 11 is fixedly mounted on the bottom of the base 7; the lower end of the lower clamping rod 11 is mounted on the lower arm of the universal testing machine;

[0049] The peeling upper pulling assembly 200 includes a pulling frame 201 and a wedge 21 disposed in the pulling frame 201. An upper clamping rod 16 is disposed on the top of the pulling frame 201.

[0050] During the actual test, the specific operation process is as follows:

[0051] Step 1. Preparation

[0052] Testing machine inspection: Confirm that the universal testing machine is in good working condition, calibrated and within the validity period. Check whether the hydraulic / power system, control system, and data acquisition system are normal.

[0053] Step 2: Install the fixture

[0054] Assemble the fixture assembly 100 and the peeling upper pull assembly 200, and install the lower clamping rod 11 on the fixture assembly 100 and the upper clamping rod 16 on the peeling upper pull assembly 200 to the lower arm and upper arm of the universal testing machine respectively;

[0055] According to the experimental requirements, adjust the positions of the two pressing members 300 on the slide rail 1. After the adjustment is completed, fix the pressing members 300 on the slide rail 1 with bolts;

[0056] Step 3: Place the connection between the upper and lower layers of the separator of the sample to be tested on the two inclined surfaces of the wedge 21;

[0057] The free ends of the upper and lower layers of the sample to be tested are fixed to the two pressing members 300 respectively;

[0058] Step 4: Start the universal testing machine and perform a peel strength test.

[0059] In the above operation, the uneven clamping of the specimen will cause a length difference dl between the upper and lower layers of the specimen, which will cause unexpected expansion of the cracks in the specimen during the loading process. The test fixture provided by the present invention has two left and right clamping ends (i.e., two clamping members 300) fixed on the slide rail 1, which rotate along with the bearing 8 on the guide assembly 400. In this way, during the loading process of the testing machine, due to the existence of this rotational freedom, the uneven clamping will cause the left and right clamping ends to rotate by a certain angle, automatically balancing the asymmetric loads on the upper and lower layers of the specimen, reducing the unexpected expansion of cracks, and ensuring the test accuracy.

[0060] like Figures 1 to 6 As shown, in some embodiments of the present invention, the upper end of the outer portion of the lower clamping rod 11 is provided with an external thread, and the bottom of the base 7 is provided with a thread groove. The external thread on the lower clamping rod 11 cooperates with the thread groove on the base 7, and the lower clamping rod 11 is locked and fixed to the base 7 by screwing in. The lower end of the outer portion of the lower clamping rod 11 is mounted on the lower arm of the universal testing machine.

[0061] Locking by threaded fitting provides a strong mechanical connection force, ensuring that the lower clamping rod 11 and the base 7 are firmly connected and not easy to loosen; in addition, the threaded fitting can also facilitate installation or disassembly, thereby facilitating its assembly, maintenance or component replacement.

[0062] like Figures 1 to 6 As shown, in some embodiments of the present invention, the upper clamping rod 16 is detachably provided on the pulling frame 201;

[0063] Specifically, an external thread is provided at the lower end of the outer portion of the upper clamping rod 16, and a thread groove is provided at the top of the pulling frame 201. The external thread on the upper clamping rod 16 cooperates with the thread groove on the pulling frame 201, and the upper clamping rod 16 is locked and fixed to the pulling frame 201 by screwing in; and the external lower end of the upper clamping rod 16 is installed on the upper arm of the universal testing machine.

[0064] like Figures 1 to 6 As shown, in some embodiments of the present invention, both ends of the double-ended stepped stud 10 are provided with external threads, and the double-ended stepped stud 10 is fitted with a nut 9 that matches the external threads. Specifically, the double-ended stepped stud 10 is composed of an intermediate connecting shaft 102 and a threaded rod 103 integrally formed and provided at both ends of the intermediate connecting shaft 102. The axes of the intermediate connecting shaft 102 and the threaded rod 103 coincide with each other. In addition, the outer diameter of the intermediate connecting shaft 102 is larger than the outer diameter of the threaded rod 103.

[0065] The slide rail 1 is provided with a mounting hole 101 adapted to fit the threaded rod 103 on the double-ended stepped stud 10;

[0066] Specifically, the base 7 is sleeved on the outside of the middle connecting shaft 102 on the double-ended stepped stud 10, and the two bearings 8 are sleeved on the outside of the middle connecting shaft 102 on the double-ended stepped stud 10, and the two bearings 8 are respectively matched and arranged in the two mounting grooves 71;

[0067] The two threaded rods 103 on the double-ended stepped stud 10 are respectively connected to the two slide rails 1; that is, the two ends of the double-ended stepped stud 10 are respectively locked and fixed in the mounting holes 101 on the slide rail 1 through two nuts 9.

[0068] like Figures 1 to 6 As shown, in some embodiments of the present invention, the peeling and pulling assembly 200 is located directly above the base 7 .

[0069] like Figures 1 to 6 As shown, in some embodiments of the present invention, the two clamping members 300 are symmetrical about the guide assembly 400, so that when the free ends of the upper layer and the lower layer of the sample to be tested are respectively fixed on the two clamping members 300, the installation symmetry of the free ends of the upper layer and the lower layer of the sample to be tested is ensured. Combined with the setting of the peeling upper pulling assembly 200 being located directly above the base 7, it can be used to keep the sample to be tested centered.

[0070] like Figures 1 to 6 As shown, in some embodiments of the present invention, the pressing member 300 includes a slider 3 and a pressing block 4 provided on the top of the slider 3, and the pressing block 4 is fixed to the slider 3 by bolts;

[0071] The slider 3 is fixed to the slide rail 1 by bolts;

[0072] The pressing block 4 is fixed to the slider 3 by bolts. Specifically, a plurality of first threaded holes are provided on the top of the pressing block 4, and first bolts 42 are provided in the first threaded holes. A second threaded hole is provided on the slider 3 at the position corresponding to the first bolts 42. The first bolts 42 are screwed into the first threaded holes on the pressing block 4 and the second threaded holes on the slider 3 in sequence, thereby fixing the pressing block 4 to the top of the slider 3. In this way, during the peel strength test, the free ends of the upper and lower layers of the sample to be tested can be pressed between the pressing block 4 and the slider 3, and then locked and fixed by the first bolts 42.

[0073] The slider 3 is fixed to the slide rail 1 by bolts. Specifically, a third threaded hole is opened on the left and right sides of the slider 3, and a second bolt 33 is provided in the third threaded hole. By tightening the second bolt 33, the slider 3 is fixed to the slide rail 1; in this way, the position of the slider 3 on the slide rail 1 can be changed.

[0074] like Figures 1 to 6As shown, in some embodiments of the present invention, a pressing groove 32 is provided on the top of the slider 3, and a pressing protrusion 41 that matches the pressing groove 32 is provided on the bottom surface of the pressing block 4;

[0075] With this arrangement, in the peel strength test, the free ends of the upper and lower layers of the sample to be tested can be pressed into the clamping groove 32 at the top of the slider 3, and the clamping protrusion 41 at the bottom of the pressing block 4 is used to preliminarily limit the free ends of the upper and lower layers of the sample to be tested, and then lock and fix them by the first bolt 42.

[0076] like Figures 1 to 6 As shown, in some embodiments of the present invention, the pulling frame 201 includes an upper pull rod connecting block 17 and upper pull rods 19 provided at both ends of the upper pull rod connecting block 17, and the upper pull rods 19 are perpendicular to the upper pull rod connecting block 17;

[0077] The upper clamping rod 16 is provided on the top of the upper pull rod connecting block 17;

[0078] The wedge 21 is disposed between the two upper pull rods 19 .

[0079] like Figures 1 to 6 As shown, in some embodiments of the present invention, the upper rod 19 is fixed to the upper rod connecting block 17 by bolts; specifically, a fourth threaded hole is formed at the upper end of the left side surface of the upper rod 19, and a third bolt 191 is installed in the fourth threaded hole. The left and right ends of the upper rod connecting block 17 are both formed with fifth threaded holes that cooperate with the third bolt 191.

[0080] With this arrangement, by tightening the third bolt 191 , the third bolt 191 passes through the fourth threaded hole on the upper rod 19 and the fifth threaded hole on the upper rod connecting block 17 in sequence, thereby fixing the upper rod 19 to the rod connecting block 17 .

[0081] like Figures 1 to 6 As shown, in some embodiments of the present invention, the wedge 21 is fixed between the two upper rods 19 by bolts;

[0082] Specifically, a sixth threaded hole is opened at the lower end of the left side of the upper pull rod 19, and a fourth bolt 192 is installed in the sixth threaded hole. The left and right ends of the wedge 21 are both opened with seventh threaded holes that match the fourth bolt 192.

[0083] With this arrangement, by tightening the fourth bolt 192 , the fourth bolt 192 is passed through the sixth threaded hole on the upper pull rod 19 and the seventh threaded hole on the wedge 21 in sequence, thereby fixing the wedge 21 between the two upper pull rods 19 .

[0084] like Figures 1 to 6 As shown, in some embodiments of the present invention, the wedge 21 is a tapered structure;

[0085] One end of the wedge 21 is a tip portion 22, and the other end of the wedge 21 is a mounting portion 23;

[0086] The tip portion 22 is disposed toward the upper rod connecting block 17;

[0087] The design of the wedge 21 with a conical structure can achieve an efficient and stable stripping effect. Specifically, due to the conical structure design of the wedge 21, especially its tip 22, it ensures that when inserted between the upper and lower layers of the separator of the sample to be tested, the contact area is minimized and the insertion resistance is reduced, so that the upper and lower layers of the separator of the sample to be tested can be peeled off smoothly and gradually.

[0088] The present invention provides a wedge-peel strength testing fixture for carbon fiber composite laminates. By providing a rotational degree of freedom between left and right clamping members, it can automatically balance asymmetric loads during test loading. Furthermore, the distance between the left and right clamping members can be adjusted to accommodate specimens of varying lengths. Furthermore, the fixture has a simple structure and is easy to install and use.

[0089] The above disclosures are only a few specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

[0090] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0091] In the description of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0092] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

Claims

1. A wedge peel strength test fixture for carbon fiber composite laminates, mounted between the upper and lower arms of a universal testing machine, characterized in that: It comprises a fixture assembly (100) and a peeling upper pulling component (200) arranged above the fixture assembly, wherein the fixture assembly (100) and the peeling upper pulling component (200) are respectively arranged on the lower arm and the upper arm of the universal testing machine; The clamp assembly (100) comprises two slide rails (1), two pressing members (300) and a guide assembly (400), wherein the two slide rails (1) are arranged opposite to each other, the two pressing members (300) are arranged on the slide rails (1), and the guide assembly (400) is arranged between the two pressing members (300) and installed on the slide rails (1); The guide assembly (400) includes a double-headed stepped stud (10), a base (7) sleeved on the outside of the double-headed stepped stud (10), and two bearings (8), the left side and the right side of the base (7) are both provided with mounting grooves (71), the two bearings (8) are sleeved on the outside of the double-headed stepped stud (10) and are respectively arranged in the two mounting grooves (71), and the two ends of the double-headed stepped stud (10) are respectively arranged on the two slide rails (1); A lower clamping rod (11) is provided at the bottom of the base (7); The peeling upper pulling assembly (200) comprises a pulling frame (201) and a wedge (21) arranged in the pulling frame (201); an upper clamping rod (16) is arranged on the top of the pulling frame (201).

2. A wedge peel strength test fixture for carbon fiber composite laminates according to claim 1, characterized in that: Both ends of the double-ended stepped stud (10) are provided with external threads, and a nut (9) matching the external threads is mounted on the double-ended stepped stud (10); The slide rail (1) is provided with a mounting hole (101) adapted to the double-headed stepped stud (10); Both ends of the double-headed stepped stud (10) are respectively locked and fixed in the mounting hole (101) on the slide rail (1) by two nuts (9).

3. A wedge peel strength test fixture for carbon fiber composite laminates according to claim 1, characterized in that: The peeling and pulling assembly (200) is located directly above the base (7).

4. A wedge peel strength test fixture for carbon fiber composite laminates according to claim 1, characterized in that: The two pressing members (300) are symmetrical with respect to the guide assembly (400).

5. A wedge peel strength test fixture for carbon fiber composite laminates according to claim 1, characterized in that: The pressing member (300) comprises a slider (3) and a pressing block (4) provided on the top of the slider (3), wherein the pressing block (4) is fixed to the slider (3) by bolts; The sliding block (3) is fixed to the sliding rail (1) by means of bolts.

6. A wedge peel strength test fixture for carbon fiber composite laminates according to claim 5, characterized in that: The top of the slider (3) is provided with a pressing groove (32), and the bottom surface of the pressing block (4) is provided with a pressing protrusion (41) that matches the pressing groove (32).

7. A wedge peel strength test fixture for carbon fiber composite laminates according to claim 1, characterized in that: The pulling frame (201) includes an upper pull rod connecting block (17) and upper pull rods (19) provided at both ends of the upper pull rod connecting block (17), and the upper pull rods (19) are perpendicular to the upper pull rod connecting block (17); The upper clamping rod (16) is arranged on the top of the upper pull rod connecting block (17); The wedge (21) is arranged between the two upper pull rods (19).

8. A wedge peel strength test fixture for carbon fiber composite laminates according to claim 7, characterized in that: The upper pull rod (19) is fixed to the upper pull rod connecting block (17) by means of bolts.

9. A wedge peel strength test fixture for carbon fiber composite laminates according to claim 7, characterized in that: The wedge (21) is fixed between the two upper pull rods (19) by means of bolts.

10. A wedge peel strength test fixture for carbon fiber composite laminates according to claim 7, characterized in that: The wedge (21) is a conical structure; One end of the wedge (21) is a tip portion (22), and the other end of the wedge (21) is a mounting portion (23); The tip portion (22) is arranged toward the upper pull rod connecting block (17).

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