Tensile test fixture and method for twisted special-shaped structure of composite material
By setting cured colloids at both ends of the twisted special-shaped structure of composite materials and clamping with transition clamping, the problem of difficulty in clamping of composite materials in the prior art is solved, and a stable and true mechanical response test is achieved, improving The accuracy and adaptability of the test were carried out.
Patent Information
- Application Number
- CN202411300453.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-01-07
AI Technical Summary
The prior art is difficult to effectively clamp and test the twisted special-shaped structure of composite materials, resulting in defects such as uneven force and slippage in the test results, and lacks real physical significance.
A tensile test fixture consisting of a plate-like transition connector and a transition clamp is designed to hold the cured colloid at both ends of the twisted profile structure of the composite material and to hold the cured colloid using a transition clamp with two clamps , ensure clamping stability and adapt to samples of different angles.
It effectively solves the clamping problem of twisted special-shaped structures of composite materials, improves the accuracy and reliability of the test, ensures the authenticity of mechanical responses, and enhances the dimensional adaptability of different twisted special-shaped structural parts.
Smart Images
Figure CN119269226A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of tensile testing of composite materials, and in particular to a tensile testing fixture and method for a twisted special-shaped structure of a composite material. Background Art
[0002] Compared with traditional metal materials, fiber composite materials can reduce weight by more than 40%. At the same time, they have the advantages of strong designability, good dimensional stability, corrosion resistance, wear resistance, and shock absorption. Therefore, composite materials are widely used in aerospace, automotive industry, and many engineering machinery. As key components, twisted and shaped structures of composite materials are widely used in various engineering structures, such as wind turbine blades, turbine blades, helicopter and aircraft engine fan blades, etc. The study of their mechanical properties has once become a hot topic and difficulty in the academic and engineering circles. Since these blade structures are mainly subjected to centrifugal force and inertial force during operation, it is necessary to study the mechanical behavior of this twisted and shaped structure prepared by the composite weaving process under unidirectional tensile load. There are relevant test methods and fixtures for the tensile test of regular flat plate structures, and there are a lot of related studies. However, for the twisted and shaped structures of woven composite materials, the surface is curved, and there is currently no relevant test standard.
[0003] The distorted special-shaped structure of the braided composite material has a three-dimensional shape. The special-shaped structures at both ends of the test structure make it impossible for the flat wedge of the tensile tester to be effectively clamped. If the traditional regular flat plate structure experiment is used to explore the mechanical behavior of the distorted special-shaped structure of the braided composite material, defects such as uneven force and slippage of the specimen will occur, which obviously lacks real physical meaning. Therefore, it is necessary to effectively design the test fixture and method of this type of special-shaped structure to obtain the mechanical response of the distorted special-shaped structure of the braided composite material under external load. Summary of the invention
[0004] The embodiments of the present invention provide a tensile testing fixture and method for twisted and shaped composite material structures, which can stably clamp the twisted and shaped composite material structures.
[0005] In a first aspect, an embodiment of the present invention provides a tensile test fixture for twisted and shaped composite materials, comprising a plate-shaped transition connector and a transition clamp;
[0006] The plate-shaped transition connector is in the shape of a flat plate, one end of which is used to be connected to the clamping end of the tensile testing machine, and the other end is clamped and fixed between the two clamping plates of the transition clamp. The two clamping plates of the transition clamp also fix one end of the composite material twisted special-shaped structural member, and the other end of the composite material twisted special-shaped structural member is fixed to the other clamping end of the tensile testing machine through another transition clamp and another transition connector. Both ends of the composite material twisted special-shaped structural member are covered with a solidified colloid, and the shape of the solidified colloid is plate-shaped so that it can be clamped by the two clamping plates of the transition clamp.
[0007] In a possible design, the two clamping plates of the transition clamp and the plate-like transition connecting piece clamped therein are both provided with threaded holes, and the two clamping plates of the transition clamp and the plate-like transition connecting piece clamped therein are fixed by a pair of bolts and nuts.
[0008] In a possible design, the solidified colloid, the twisted and shaped structural part of the composite material inside the solidified colloid, and the clamping plates of the transition clamping parts on both sides thereof are all provided with threaded holes, and the solidified colloid, the twisted and shaped structural part of the composite material inside the solidified colloid, and the clamping plates of the transition clamping parts on both sides thereof are fixed by multiple pairs of bolts and nuts.
[0009] In a possible design, the two clamping plates of the transition clamp are used to clamp the portion of the solidified colloid so as to be aligned with the edge of the solidified colloid.
[0010] In a possible design, the material used to prepare the curing colloid is two-component liquid silicone rubber.
[0011] In a second aspect, an embodiment of the present invention further provides a tensile testing method for a twisted special-shaped structure of a composite material, comprising:
[0012] Connect one end of a plate-shaped transition connector to the clamping end of a tensile testing machine, and clamp and fix the other end between two clamping plates of the transition clamping member;
[0013] One end of the twisted special-shaped structure of the composite material is fixedly clamped by two clamping plates of the transition clamp; wherein both ends of the twisted special-shaped structure of the composite material are covered with a solidified colloid, and the solidified colloid is in a plate shape so that it can be clamped by the two clamping plates of the transition clamp;
[0014] The other end of the composite material twisted special-shaped structural member is connected to the other clamping end of the tensile testing machine through another plate-shaped transition connecting member and another transition clamping member according to the above connection method.
[0015] In a possible design, two clamping plates of the transition clamping member with preset threaded holes and the plate-shaped transition connecting member clamped by the two clamping plates are fixedly connected by a pair of bolts and nuts.
[0016] In a possible design, the solidified colloid, the composite material twisted special-shaped structure inside the solidified colloid, and the clamping plates of the transition clamping members on both sides thereof are fixedly connected by multiple pairs of bolts and nuts.
[0017] In a possible design, the solidified colloid is polished so that the portions of the two clamping plates of the transition clamping member used for clamping the solidified colloid are aligned with the edges of the solidified colloid.
[0018] In a possible design, two ends of the composite material twisted special-shaped structure are immersed in rectangular containers filled with two-component liquid silicone rubber respectively, and after curing, the cured colloid is obtained at the two ends of the composite material twisted special-shaped structure.
[0019] Compared with the prior art, the present invention has at least the following beneficial effects:
[0020] In the present invention, since the two ends of the twisted composite material twisted special-shaped structural member are twisted and are not plates located in the same plane, it is difficult for the current tensile testing machine to effectively clamp it. In order to solve this problem, a solidified colloid is set at both ends of the twisted special-shaped structural member of the composite material. The shape of the solidified colloid is rectangular and can be stably clamped by a transition clamp with two clamps. In other words, the solidified colloid can adapt to twisted test pieces of different angles. By setting a rectangular solidified colloid at both ends of the twisted special-shaped structural member of the composite material, it can be clamped at both ends by a transition clamp with two clamps. The transition clamp with two clamps cannot be directly connected to the tensile testing machine. Therefore, the two clamps of the transition clamp clamp clamp the plate-shaped transition connector at the same time, and the plate-shaped transition connector is connected to the tensile testing machine. At the same time, it effectively solves the cumbersome problem of clamping the twisted special-shaped structural member, and greatly improves the size adaptability of different twisted special-shaped structural members. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0022] Figure 1 It is a structural schematic diagram of a tensile test fixture for a twisted special-shaped structure of a composite material provided by an embodiment of the present invention;
[0023] Figure 2 An embodiment of the present invention provides a twisted special-shaped structural part wrapped with a solidified colloid.
[0024] In the figure:
[0025] 1- Plate-shaped transition connector; 2- Transition clamp; 3- Cured colloid; 4- Twisted special-shaped structural part. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0027] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0028] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present invention are described at the angles shown in the drawings and should not be understood as limiting the embodiments of the present invention. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.
[0029] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a tensile test fixture for twisted special-shaped structures of composite materials, including a plate-shaped transition connector 1 and a transition clamp 2;
[0030] The plate-shaped transition connector 1 is in the shape of a flat plate, one end of which is used to be connected to the clamping end of the tensile testing machine, and the other end is clamped and fixed between the two clamping plates of the transition clamp 2. The two clamping plates of the transition clamp 2 also fix one end of the composite material twisted special-shaped structural member 4. The other end of the composite material twisted special-shaped structural member 4 is fixed to the other clamping end of the tensile testing machine through another transition clamp 2 and another transition connector. Both ends of the composite material twisted special-shaped structural member 4 are covered with a solidified colloid 3, and the shape of the solidified colloid 3 is plate-shaped so that it can be clamped by the two clamping plates of the transition clamp 2.
[0031] In the present invention, since the two ends of the twisted composite material twisted special-shaped structural member 4 are twisted and are not plates located in the same plane, it is difficult for the current tensile testing machine to effectively clamp it. In order to solve this problem, a solidified colloid 3 is set at both ends of the composite material twisted special-shaped structural member 4. The solidified colloid 3 is rectangular in shape and can be stably clamped by a transition clamp 2 with two clamps. In other words, the solidified colloid 3 can adapt to twisted test pieces at different angles. By setting a rectangular solidified colloid 3 at both ends of the composite material twisted special-shaped structural member 4, it can be clamped at both ends by a transition clamp 2 with two clamps. The transition clamp 2 with two clamps cannot be directly connected to the tensile testing machine. Therefore, the two clamps of the transition clamp 2 clamp the plate-shaped transition connector 1 at the same time, and the plate-shaped transition connector 1 is connected to the tensile testing machine. At the same time, the cumbersome clamping problem of the twisted special-shaped structural member 4 is effectively solved, and the size adaptability of different twisted special-shaped structural members 4 is greatly improved.
[0032] In the present invention, the tensile testing machine is an existing device, such as a KDS-1017 universal material testing machine.
[0033] In some embodiments of the present invention, the two clamping plates of the transition clamp 2 and the plate-like transition connector 1 clamped therein are both provided with threaded holes, and the two clamping plates of the transition clamp 2 and the plate-like transition connector 1 clamped therein are fixed by a pair of bolts and nuts.
[0034] In this embodiment, a pair of bolts and nuts can realize axial connection between the plate-like transition connector 1 and the transition clamp 2 . Meanwhile, the bolts and nuts can also adjust the clamping force of the transition clamp 2 .
[0035] In some embodiments of the present invention, the solidified colloid 3, the composite material twisted special-shaped structure 4 inside the solidified colloid 3, and the clamping plates of the transition clamping parts 2 on both sides thereof are all provided with threaded holes, and the solidified colloid 3, the composite material twisted special-shaped structure 4 inside the solidified colloid 3, and the clamping plates of the transition clamping parts 2 on both sides thereof are fixed by multiple pairs of bolts and nuts.
[0036] In this embodiment, multiple pairs of bolts and nuts can achieve the fastening and clamping of the two clamping plates, and can also prevent the displacement and twisting between the transition clamping member 2 and the twisted special-shaped structural member 4. In addition, the fixing method of the bolts and nuts can also make the two clamping plates adapt to the different thicknesses of the solidified colloid 3.
[0037] It should be noted that the bolt needs to pass through the twisted special-shaped structural member 4 . Otherwise, if the bolt only passes through the solidified colloid 3 , it will lead to erroneous test results, or even breakage due to insufficient strength of the solidified colloid 3 .
[0038] In some embodiments of the present invention, the two clamping plates of the transition clamp 2 are used to clamp a portion of the solidified colloid 3 and align with the edge of the solidified colloid 3 .
[0039] In this embodiment, the solidified colloid 3 is obtained by solidifying the glue liquid, and in order to adapt to the splint, it needs to be polished to match the splint.
[0040] In some embodiments of the present invention, the material for preparing the curing colloid 3 is two-component liquid silicone rubber.
[0041] The curing colloid 3 is a two-component liquid silicone rubber material. The two ends of the twisted special-shaped structural part 4 are placed vertically in a rectangular container and fixed in position. Then the two-component liquid silicone rubber is injected into the rectangular container to completely immerse the end positions of the twisted special-shaped structural part 4. After the colloid solution is cured, it is taken out and the same operation is performed on the other end of the sample.
[0042] The embodiment of the present invention also provides a tensile testing method for a twisted special-shaped structure of a composite material, comprising:
[0043] One end of the plate-shaped transition connector 1 is connected to the clamping end of the tensile testing machine, and the other end is clamped and fixed between two clamping plates of the transition clamp 2;
[0044] One end of the composite material twisted special-shaped structure 4 is fixedly clamped by two clamping plates of the transition clamping member 2; wherein both ends of the composite material twisted special-shaped structure 4 are covered with a solidified colloid 3, and the solidified colloid 3 is in a plate shape so that it can be clamped by the two clamping plates of the transition clamping member 2;
[0045] The other end of the composite material twisted special-shaped structural member 4 is connected to the other clamping end of the tensile testing machine through another plate-shaped transition connecting member 1 and another transition clamping member 2 according to the above connection method.
[0046] In some embodiments of the present invention, two clamping plates of a transition clamping member 2 with preset threaded holes and the plate-shaped transition connecting member 1 clamped therein are fixedly connected by a pair of bolts and nuts.
[0047] In some embodiments of the present invention, the solidified colloid 3, the composite material twisted special-shaped structure 4 inside the solidified colloid 3 and the clamping plates of the transition clamping member 2 on both sides thereof are fixedly connected by multiple pairs of bolts and nuts.
[0048] In some embodiments of the present invention, the solidified colloid 3 is polished so that the parts of the two clamping plates of the transition clamp 2 for clamping the solidified colloid 3 are aligned with the edges of the solidified colloid 3 .
[0049] In some embodiments of the present invention, both ends of the composite material twisted special-shaped structure 4 are immersed in rectangular containers filled with two-component liquid silicone rubber respectively, and after curing, cured colloid 3 is obtained at both ends of the composite material twisted special-shaped structure 4 .
[0050] It should be noted that the method embodiment of the present application and the above-mentioned clamp embodiment belong to the same inventive concept, and therefore can achieve the same beneficial effects. Please refer to the clamp embodiment for the specific beneficial effects, which will not be repeated here.
[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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A tensile test fixture for twisted and shaped composite materials, characterized in that: It comprises a plate-shaped transition connecting piece (1) and a transition clamping piece (2); The plate-shaped transition connector (1) is in the shape of a flat plate, one end of which is used to be connected to the clamping end of the tensile testing machine, and the other end is clamped and fixed between the two clamping plates of the transition clamp (2). The two clamping plates of the transition clamp (2) also clamp one end of the composite material twisted special-shaped structural member (4). The other end of the composite material twisted special-shaped structural member (4) is fixed to the other clamping end of the tensile testing machine through another transition clamp (2) and another transition connector. Both ends of the composite material twisted special-shaped structural member (4) are covered with a solidified colloid (3). The solidified colloid (3) is in the shape of a plate so that it can be clamped by the two clamping plates of the transition clamp (2).
2. The clamp according to claim 1, characterized in that: The two clamping plates of the transition clamp (2) and the plate-shaped transition connecting piece (1) clamped therein are both provided with threaded holes, and the two clamping plates of the transition clamp (2) and the plate-shaped transition connecting piece (1) clamped therein are fixed by a pair of bolts and nuts.
3. The clamp according to claim 1, characterized in that: The solidified colloid (3), the composite material twisted special-shaped structure (4) inside the solidified colloid (3), and the clamping plates of the transition clamping parts (2) on both sides thereof are all provided with threaded holes, and the solidified colloid (3), the composite material twisted special-shaped structure (4) inside the solidified colloid (3), and the clamping plates of the transition clamping parts (2) on both sides thereof are fixed by multiple pairs of bolts and nuts.
4. The clamp according to claim 1, characterized in that: The two clamping plates of the transition clamp (2) are used to clamp a portion of the solidified colloid (3) and align with the edge of the solidified colloid (3).
5. The clamp according to claim 1, characterized in that: The material used to prepare the curing colloid (3) is two-component liquid silicone rubber.
6. A tensile testing method for twisted and shaped composite materials, characterized in that: include: One end of a plate-shaped transition connector (1) is connected to the clamping end of a tensile testing machine, and the other end is clamped and fixed between two clamping plates of the transition clamp (2); One end of a twisted special-shaped composite material structure (4) is fixedly clamped by two clamping plates of the transition clamp (2); wherein both ends of the twisted special-shaped composite material structure (4) are covered with a solidifying colloid (3), and the solidifying colloid (3) is in a plate shape so that it can be clamped by the two clamping plates of the transition clamp (2); The other end of the composite material twisted special-shaped structural member (4) is connected to the other clamping end of the tensile testing machine through another plate-shaped transition connecting member (1) and another transition clamping member (2) according to the above-mentioned connection method.
7. The method according to claim 6, characterized in that The two clamping plates of the transition clamping piece (2) with preset threaded holes and the plate-shaped transition connecting piece (1) clamped therein are fixedly connected by a pair of bolts and nuts.
8. The method according to claim 6, characterized in that The solidified colloid (3), the composite material twisted special-shaped structural member (4) inside the solidified colloid (3), and the clamping plates of the transition clamping member (2) on both sides thereof are fixedly connected by a plurality of pairs of bolts and nuts.
9. The method according to claim 6, characterized in that The solidified colloid (3) is polished so that the parts of the two clamping plates of the transition clamp (2) used to clamp the solidified colloid (3) are aligned with the edges of the solidified colloid (3).
10. The method according to claim 6, characterized in that The two ends of the composite material twisted special-shaped structural member (4) are respectively immersed in a rectangular container filled with two-component liquid silicone rubber, and after curing, the cured colloid (3) is obtained at the two ends of the composite material twisted special-shaped structural member (4).