Adjustable clamp for detecting bonding strength of ceramic composite material

Abstract

The utility model relates to the technical field of detection fixtures, in particular to an adjustable fixture for detecting the bonding strength of a ceramic composite material, which comprises two groups of clamping components arranged in pairs, and the ceramic composite material is positioned between the two groups of oppositely arranged clamping components. The ceramic composite material is provided with a plurality of hollow channels in the opening and closing direction of the clamping assembly. Each clamping assembly comprises a fixing table, two pairs of rotating rods and two pairs of clamping blocks, the end of each rotating rod is detachably connected with one clamping block, a clamping space is formed in the inner side of the fixing table, the two clamping blocks are oppositely arranged in the clamping space, the two rotating rods are in threaded connection with the two sides of the fixing table respectively, and the ends of the two rotating rods are fixedly connected with one sides of the clamping blocks. A plurality of protrusions are arranged on the side, away from the rotating rod, of the clamping block, and each protrusion is arranged at the end of the channel corresponding to the ceramic composite material in an inserted mode. The clamping stability of the clamp is guaranteed, the universality and flexibility of the clamp are improved, and the detection efficiency and the accuracy of a detection result are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of detection fixtures, in particular to an adjustable fixture used for detecting the bonding strength of ceramic composite materials. Background Art

[0002] Ceramic-based composites (CMCs) are high-performance composite materials composed of ceramics as the matrix and other reinforcement materials. These materials combine the excellent properties of ceramics, such as high strength, high hardness, high temperature resistance, oxidation resistance, and corrosion resistance. By introducing reinforcements, they effectively improve the brittleness of ceramics and enhance the toughness and reliability of the materials.

[0003] For a single material, different forms of combination can be carried out through sintering, bonding and other different methods to form an overall ceramic-based composite material. The bonding strength of the ceramic-based composite material needs to be tested using a tensile testing fixture to ensure that its bonding strength can meet the use requirements of the material. In related technologies, such as the patent with publication number CN116380637A, an adjustable ceramic-based composite material tensile testing fixture is disclosed. By adjusting the slider, a clamping effect is formed on the two ends of the material to ensure the smooth progress of the tensile test.

[0004] During the tensile test, the fixture needs to ensure that the specimen material and the fixture are on the same horizontal line. However, due to the slight deformation, bending, twisting and other problems of the ceramic material after bonding and sintering, the combined cross-section is not in the same horizontal plane, and there are warping, inclination and other phenomena. As a result, the fixture will apply horizontal shear force to the specimen material when tightened, making the final test value low, affecting the accuracy of the measurement results. In addition, the friction force that the above-mentioned fixture can provide during stretching is relatively small. When testing hollow and multi-channel ceramic-based composite materials, the contact area is significantly reduced during clamping, resulting in a further reduction in the friction that the fixture can provide. During the stretching process, unstable clamping is prone to occur, and in severe cases, relative displacement will occur, greatly affecting the detection efficiency and the accuracy of the test results.

[0005] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or any form of implication that the information constitutes the prior art known to those skilled in the art. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide an adjustable clamp for testing the bonding strength of ceramic composite materials, improve the clamping stability and wide application of the clamp, and further improve the testing efficiency and the accuracy of the test results.

[0007] To achieve the above-mentioned object, the technical solution adopted by the present invention is: an adjustable clamp for testing the bonding strength of ceramic composite materials, comprising: two sets of clamping components arranged in pairs, the ceramic composite material is located between the two sets of clamping components arranged opposite to each other, and the ceramic composite material is provided with a plurality of hollow channels along the opening and closing directions of the clamping components;

[0008] Each group of the clamping components includes a fixed platform, a rotating rod and a clamping block. Two pairs of the rotating rods and the clamping blocks are provided, and each end of the rotating rod is detachably connected to a clamping block. A clamping space is provided on the inner side of the fixed platform, and the two clamping blocks are relatively arranged in the clamping space. The two rotating rods are respectively screwed to the two sides of the fixed platform, and the ends are fixedly connected to one side of the clamping block. A number of protrusions are provided on the side of the clamping block away from the rotating rod, and each of the protrusions is respectively inserted into the channel end corresponding to the ceramic composite material.

[0009] Furthermore, the shape of the protrusion is circular, square or polygonal.

[0010] Furthermore, the size of the protrusion is 30% to 95% of the size of the channel.

[0011] Furthermore, an anti-slip layer is provided on the surface of the clamping block, and the anti-slip layer is located on the side of the clamping block facing the ceramic composite material.

[0012] Furthermore, the fixing platform includes a supporting section and a clamping section. There are two clamping sections, which are respectively fixed vertically at both ends of the supporting section, and each clamping section is screwed with a rotating rod.

[0013] Furthermore, each of the clamping sections is provided with a first threaded hole, and the axes of the two first threaded holes are collinearly arranged, and the rotating rod is threadedly connected to the clamping section through the first threaded hole.

[0014] Furthermore, a second threaded hole is provided through the middle of the support section, the axis of the second threaded hole is perpendicular to the axis of the first threaded hole, and the tensile machine is connected to the fixed platform through the second threaded hole.

[0015] Furthermore, the rotating rod includes a coaxially arranged rotating section and a rotating joint, the outer axial surface of the rotating section is provided with a thread, the rotating section is threadedly arranged in the first threaded hole, the rotating joint is located at the end of the rotating section away from the clamping block, and the shaft diameter of the rotating joint is larger than the shaft diameter of the rotating section.

[0016] Furthermore, the outer surface of the rotating rod is provided with scale marks, and the scale marks are arranged along the length direction of the rotating rod.

[0017] Furthermore, a female connector is provided on one side of the clamping block away from the protrusion, and the rotary rod shrinks toward one end of the clamping block to form a male connector, which is plugged into the female connector.

[0018] The beneficial effects of the present invention are as follows: by arranging a protrusion on the clamping block and inserting the protrusion into the end of the hollow channel of the ceramic composite material, the present invention can provide a more stable clamping effect, reduce the sliding and displacement of the material during the tensile test, and also reduce the horizontal shear force applied when tightening the specimen, thereby avoiding affecting the measurement results and ensuring the accuracy of the test; through the detachable connection between the rotary rod and the clamping block, the structural shape of the clamping block can be easily adjusted to adapt to specimens of different sizes, thereby increasing the versatility and flexibility of the clamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic structural diagram of an adjustable fixture for testing the bonding strength of ceramic composite materials in an embodiment of the present utility model;

[0021] Figure 2 This is a schematic structural diagram of the clamping assembly in an embodiment of the present utility model;

[0022] Figure 3 This is a side view of the clamping assembly in an embodiment of the present utility model;

[0023] Figure 4 for Figure 3 Cross-sectional view at AA in the middle;

[0024] Figure 5 This is a schematic structural diagram of a clamping block in an embodiment of the present utility model;

[0025] Figure 6 This is a structural diagram of a fixed platform in an embodiment of the present utility model;

[0026] Figure 7 This is a side view of the clamping block and the rotating rod in the embodiment of the present utility model;

[0027] Figure 8 for Figure 7 Cross-sectional view at the middle BB.

[0028] Figure numerals: 1, ceramic composite material; 1a, channel; 10, clamping assembly; 10a, clamping space; 11, fixing platform; 111, supporting section; 111a, second threaded hole; 112, clamping section; 112a, first threaded hole; 12, rotating rod; 121, rotating section; 122, rotating joint; 123, connecting male head; 13, clamping block; 131, protrusion; 132, connecting female head. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] like Figures 1 to 8 The adjustable fixture for testing the bonding strength of ceramic composite materials shown includes: two sets of clamping assemblies 10 arranged in pairs, a ceramic composite material 1 is located between the two sets of oppositely arranged clamping assemblies 10, and the ceramic composite material 1 is provided with a plurality of hollow channels 1a along the opening and closing direction of the clamping assemblies 10;

[0033] Each set of clamping components 10 includes a fixed platform 11, a rotating rod 12 and a clamping block 13. Two pairs of rotating rods 12 and clamping blocks 13 are provided, and each end of the rotating rod 12 is detachably connected to a clamping block 13. A clamping space 10a is provided on the inner side of the fixed platform 11. The two clamping blocks 13 are relatively arranged in the clamping space 10a. The two rotating rods 12 are respectively screwed to the two sides of the fixed platform 11, and the ends are fixedly connected to one side of the clamping block 13. A plurality of protrusions 131 are provided on the side of the clamping block 13 away from the rotating rod 12, and each protrusion 131 is respectively inserted into the end of the channel 1a corresponding to the ceramic composite material 1.

[0034] The present invention provides a more stable clamping effect by arranging a protrusion 131 on the clamping block 13 and inserting the protrusion 131 into the end of the hollow channel 1a of the ceramic composite material 1, thereby reducing the sliding and displacement of the material during the tensile test, and also reducing the horizontal shear force applied when tightening the specimen, thereby avoiding affecting the measurement results and ensuring the accuracy of the test; through the detachable connection between the rotating rod 12 and the clamping block 13, the structural shape of the clamping block 13 can be easily adjusted to adapt to specimens of different sizes, thereby increasing the versatility and flexibility of the clamp.

[0035] It should be noted that the clamp in this embodiment is highly applicable and can be applied to both regular and irregular ceramic composite material 1 specimens; if the test specimen does not have any deformation, bending, twisting or other problems, the specimen can be clamped directly by the clamping blocks 13 on both sides; otherwise, a gap can be left between the clamping blocks 13 and the specimen during the tightening action, which is 1%-50% of the height of the protrusion 131, so that during the test, the material to be tested can rely on the gap to adjust its own position to avoid generating horizontal shear force.

[0036] Based on the above embodiments, the shape of the protrusion 131 is circular, square or polygonal; the polygon can be a triangle, rhombus, hexagon, etc. Providing protrusions 131 in various shapes can adapt to hollow channels 1a of different shapes, thereby increasing the adaptability and flexibility of the clamp.

[0037] Based on the above embodiment, the size of the protrusion 131 is 30% to 95% of the size of the corresponding channel 1a; the specific size needs to be determined according to the shape and size of the hollow of the ceramic composite material 1 or the size of the channel 1a, the spacing of the protrusions 131 needs to be equal to the center distance of the channel 1a of the ceramic composite material 1, and the number of protrusions 131 needs to be determined based on the contact area required for clamping the ceramic composite material 1 and rounded off. The height of the protrusion 131 is generally designed to be 1% to 50% of the cutting thickness of the ceramic composite material 1, and it is necessary to ensure that a suitable stretching gap is left between the two sets of clamping components 10.

[0038] Specifically, a silicon carbide ceramic membrane group with a 9-hole square channel 1a is used as the test piece for the bonding strength test. It is cut into 20 mm thick sheets. The side length of the square channel 1a is 7 mm and the center distance is 9.25 mm. It can be determined that the shape of the protrusion 131 on the clamping block 13 is square, the side length of the protrusion 131 is 5 mm, and the ratio is about 71.4%; the number of protrusions 131 is 9, the ratio is 100%, and the height of the protrusion 131 is 10 mm, the ratio is 50%.

[0039] A silicon carbide ceramic membrane group with a 36-hole square channel 1a was used as the test piece for the bonding strength test. It was cut into 50 mm thick sheets. The side length of the square channel 1a was 10 mm and the center distance was 12.25 mm. It was determined that the shape of the protrusion 131 on the clamping block 13 was square, the side length of the protrusion 131 was 8 mm, and the ratio was approximately 80%; the number of protrusions 131 was 36, and the ratio was 100%; the height of the protrusion 131 was 25 mm, and the ratio was 50%; when the test piece was twisted, the rotating rod 12 was not tightened, so that the gap between the test piece and the detachable clamping block 13 was 2 mm, and the ratio was 8%, leaving room for the test piece to move. After assembly was completed, the tensile testing machine was started and the data was recorded.

[0040] On the basis of the above embodiment, when testing a ceramic composite material 1 without holes or channels 1a, a clamping block 13 without the protrusion 131 can be selected, and an anti-slip layer is provided on the surface of the clamping block 13, and the anti-slip layer is located on the side of the clamping block 13 facing the ceramic composite material 1; the anti-slip layer provides a clamping force to the test piece to prevent the material from sliding or rotating during the tensile test, thereby ensuring the stability of the clamping, improving the clamping accuracy during the test, and thus improving the reliability of the test data.

[0041] On the basis of the above embodiment, the fixing platform 11 includes a supporting section 111 and a clamping section 112. Two clamping sections 112 are provided, which are respectively fixed vertically at the two ends of the supporting section 111, and each clamping section 112 is screwed with a rotating rod 12; by vertically fixing the clamping sections 112 at the two ends of the supporting section 111, a stable structural frame can be formed, which is beneficial to improving the rigidity and stability of the entire clamp; the symmetrical layout helps to evenly distribute the force applied by the clamp on the ceramic composite material 1, reducing the deviation caused by uneven force; the rotating rod 12 screwed on each clamping section 112 can be easily adjusted to adapt to ceramic composite materials 1 of different sizes, thereby improving the applicability and flexibility of the clamp.

[0042] On the basis of the above embodiment, each clamping section 112 is provided with a first threaded hole 112a, and the axes of the two first threaded holes 112a are collinearly arranged, and the rotating rod 12 is screwed to the clamping section 112 through the first threaded hole 112a; the collinearly arranged first threaded holes 112a improves the centering accuracy of the assembly, provides good clamping force, and is conducive to ensuring the stability and reliability of the clamp during use; the rotating rod 12 is screwed to the clamping section 112 through the threaded hole, which can be quickly installed and disassembled, making it convenient for the user to adjust the position of the rotating rod 12 or perform maintenance as needed.

[0043] On the basis of the above embodiment, a second threaded hole 111a is provided through the middle of the support section 111, and the axis of the second threaded hole 111a is perpendicular to the axis of the first threaded hole 112a. The tensile machine is connected to the fixed platform 11 through the second threaded hole 111a; the setting of the axis of the second threaded hole 111a being perpendicular to the axis of the first threaded hole 112a makes the connection between the tensile machine and the fixed platform 11 more stable, which is conducive to maintaining the stability of the fixture during tensile testing; by connecting to the tensile machine through the second threaded hole 111a, installation and adjustment can be conveniently performed to ensure the coaxiality and horizontality between the fixture and the tensile machine, thereby improving the accuracy of the test; it also allows the fixture to be compatible with different models of tensile machines. As long as the specifications of the threaded hole match the tensile machine, quick connection can be achieved.

[0044] On the basis of the above embodiment, the rotary rod 12 includes a coaxially arranged rotary section 121 and a rotary joint 122, the outer axial surface of the rotary section 121 is provided with a thread, the rotary section 121 is threadedly arranged in the first threaded hole 112a, and the rotary joint 122 is located at the end of the rotary section 121 away from the clamping block 13, and the axial diameter of the rotary joint 122 is larger than the axial diameter of the rotary section 121; the design of the rotary section 121 allows the rotary rod 12 to be easily adjusted to adapt to ceramic composite material 1 specimens of different thicknesses, providing better flexibility and adaptability; the axial diameter of the rotary joint 122 is larger than the axial diameter of the rotary section 121, which is convenient for the user to grasp and operate, thereby realizing convenient tightening of the rotary rod 12.

[0045] On the basis of the above embodiment, the outer surface of the rotating rod 12 is provided with scale markings, which are arranged along the length direction of the rotating rod 12; the scale markings provide a visual reference, so that the user can accurately adjust the position and clamping force of the rotating rod 12, and can quickly adjust to the desired position through the scale, reducing adjustment time and improving work efficiency.

[0046] On the basis of the above embodiment, a connecting female head 132 is provided on the side of the clamping block 13 away from the protrusion 131, and the rotating rod 12 shrinks toward one end of the clamping block 13 to form a connecting male head 123, which is plugged into the connecting male head 123; through the plug-in setting of the connecting female head 132 and the connecting male head 123, the rotating rod 12 and the clamping block 13 can be quickly assembled and unassembled, thereby improving the working efficiency and ease of use of the clamp; the coordinated use of the connecting male head 123 and the connecting female head 132 can provide a stable connection, ensuring that the rotating rod 12 can maintain a firm connection under high load; it also reduces the volume of the clamp, making the clamp more compact and lightweight.

[0047] Before use, it is necessary to determine and select the shape and size of the protrusion 131 on the corresponding clamping block 13 according to the channel 1a or hollow shape of the ceramic composite material 1. After selection, the two fixed platforms 11 in the two sets of clamping assemblies 10 are respectively connected and tightened to the upper and lower connections of the tensile machine, and the rotating rod 12 is screwed into the two first threaded holes 112a respectively. Then, the selected clamping block 13 is plugged and fixed with the connecting male head 123 of the corresponding side rotating rod 12 through the connecting female head 132 to complete the installation process of the clamp.

[0048] When conducting the bonding strength detection test, the ceramic composite material 1 specimen to be tested is placed in the clamping assembly 10 below, and the clamping blocks 13 on both sides are clamped on the bottom of the specimen by tightening the rotary rod 12. The specimen is in the middle position of the fixed table 11, and then located at the height of the fixed table 11 above the tensile testing machine, so that the protrusion 131 of the upper clamping block 13 can be inserted into the corresponding channel 1a above the specimen, and the upper part of the rotary rod 12 is tightened to form a clamping effect, and avoid applying horizontal force to the specimen, completing the assembly process of the specimen. At this time, the tensile testing machine can be started to perform the strength detection test and record the experimental data.

[0049] Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and the specification are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable fixture for testing the bonding strength of ceramic composite materials, characterized in that: include: Two sets of clamping assemblies are arranged in pairs, the ceramic composite material is located between the two sets of clamping assemblies arranged opposite to each other, and the ceramic composite material is provided with a plurality of hollow channels along the opening and closing directions of the clamping assemblies; Each group of the clamping components includes a fixed platform, a rotating rod and a clamping block. Two pairs of the rotating rods and the clamping blocks are provided, and each end of the rotating rod is detachably connected to a clamping block. A clamping space is provided on the inner side of the fixed platform, and the two clamping blocks are relatively arranged in the clamping space. The two rotating rods are respectively screwed to the two sides of the fixed platform, and the ends are fixedly connected to one side of the clamping block. A number of protrusions are provided on the side of the clamping block away from the rotating rod, and each of the protrusions is respectively inserted into the channel end corresponding to the ceramic composite material.

2. The adjustable fixture for testing the bonding strength of ceramic composite materials according to claim 1, characterized in that: The shape of the protrusion is circular, square or polygonal.

3. The adjustable fixture for testing the bonding strength of ceramic composite materials according to claim 1, characterized in that: The size of the protrusion is 30% to 95% of the size of the channel.

4. The adjustable fixture for testing the bonding strength of ceramic composite materials according to claim 1, characterized in that: The surface of the clamping block is provided with an anti-slip layer, and the anti-slip layer is located on a side of the clamping block facing the ceramic composite material.

5. The adjustable fixture for testing the bonding strength of ceramic composite materials according to claim 1, characterized in that: The fixing platform includes a supporting section and a clamping section. Two clamping sections are provided and are respectively fixed vertically at two ends of the supporting section. A rotating rod is screwed on each clamping section.

6. The adjustable fixture for testing the bonding strength of ceramic composite materials according to claim 5, characterized in that: A first threaded hole is provided through each of the clamping sections, and the axes of the two first threaded holes are arranged collinearly, and the rotating rod is threadedly connected to the clamping section through the first threaded hole.

7. The adjustable fixture for testing the bonding strength of ceramic composite materials according to claim 6, characterized in that: A second threaded hole is provided through the middle of the support section, the axis of the second threaded hole is perpendicular to the axis of the first threaded hole, and the tensile machine is connected to the fixed platform through the second threaded hole.

8. The adjustable fixture for testing the bonding strength of ceramic composite materials according to claim 6, characterized in that: The rotating rod includes a coaxially arranged rotating section and a rotating joint, the outer axial surface of the rotating section is provided with a thread, the rotating section is threadedly arranged in the first threaded hole, the rotating joint is located at the end of the rotating section away from the clamping block, and the shaft diameter of the rotating joint is larger than the shaft diameter of the rotating section.

9. The adjustable fixture for testing the bonding strength of ceramic composite materials according to claim 8, characterized in that: The outer surface of the rotating rod is provided with scale marks, and the scale marks are arranged along the length direction of the rotating rod.

10. The adjustable fixture for testing the bonding strength of ceramic composite materials according to claim 9, characterized in that: A female connector is provided on one side of the clamping block away from the protrusion, and the rotary rod shrinks toward one end of the clamping block to form a male connector, which is plugged into the female connector.

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