CN104237005A - Split type clamp used for testing shear strength of ceramic matrix composite - Google Patents
Split type clamp used for testing shear strength of ceramic matrix composite Download PDFInfo
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- CN104237005A CN104237005A CN201410487907.5A CN201410487907A CN104237005A CN 104237005 A CN104237005 A CN 104237005A CN 201410487907 A CN201410487907 A CN 201410487907A CN 104237005 A CN104237005 A CN 104237005A
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Abstract
The invention discloses a split type clamp used for testing the shear strength of a ceramic matrix composite. The split type clamp comprises a left fixing block, a supporting block, a right fixing block and a clamp base, wherein the clamp base is of a rectangular groove-shaped structure, the left side surface and the right side surface of the clamp base are inclined surfaces, the angle of the inclined surface on the inner side of the clamp base and the angle of the inclined surface of the left fixing block are the same, the supporting block is located at the bottom in the clamp base, the left fixing block and the right fixing block are located at the two ends of the supporting block at the bottom in the clamp base, a trapezoid block and a cuboid block are respectively located on the opposite sides of the left fixing block and the right fixing block, two trapezoid wedges are respectively located on the inner side of the clamp base, and are tightly matched with the clamp base, the left fixing block and the right fixing block. When the split type clamp is used in testing, the influences of buckling effect on the test result are reduced, so that the experiment result is much closer to the real shear strength of the material, and the clamp fracture caused by local stress concentration at the high temperature is also effectively avoided.
Description
Technical field
The present invention relates to the fixture of the test compound strength of materials, specifically, relating to a kind of split type fixture for testing ceramic matric composite shear resistance.
Background technology
Cutting performance is one of the most basic mechanical property of material.What be most widely used in the method for prior art test Continuous Fiber Reinforced Ceramic Matrix Composites shear resistance is the document " ASTM C1425 and ASTM C1292 standard " of the U.S..A kind of fixture testing Continuous Fiber Reinforced Ceramic Matrix Composites cutting performance of recommendation respectively in these two standards.
In the fixture that ASTM C1292 recommends, utilize screw thread upper and lower fixture block and fixture to be coupled together, thus sample is fixed, in order to avoid bend when loading.The weak point of this fixture is: be only applicable to room temperature shear test.
In the fixture that ASTM C1425 recommends, using piston structure, by increasing one deck intermediate layer material between fixture and sample, relying on the difference of material at high temperature thermal expansion amount to guarantee the impact of sample not effect by bending in process of the test.But require that the thermal expansivity of the interphase material used is more than or equal to sample thermal expansivity in a thickness direction.The weak point of fixture is: all will select the intermediate layer material matched separately for the different material of test, therefore the range of application of test fixture is restricted; In addition due to sample, coefficient of thermal expansion mismatch between middle layer and fixture, sample is at high temperature made to be subject to compressive stress.In addition, in the application, fixture can not be able to ensure because of wearing and tearing to clamp accurately sample, and these all can increase the error of test findings.
Disclose in patent of invention 200910023320.8 " a kind of can be used for tests the room temperature of continuous fiber reinforced composite materials and the fixture of shear at high temperature intensity ", but fixture has the following disadvantages in the application: first, the lower clamp supporting sample is as a whole, because stress raisers are easily damaged during high temperature test; The second, the distortion of high temperature lower clamp can cause sample holder to go wrong, and sample is easily toppled over, and sample center and upper down-pressed pole occur misaligning phenomenon, thus can not obtain Validity Test result.
Summary of the invention
For the deficiency that prior art exists, and the room temperature fixture different with applied at elevated temperature, test result error is large, fixture usable range is little, fixture is fragile, the life-span is short problem; The present invention proposes a kind of split type fixture for testing ceramic matric composite shear resistance.
The technical solution adopted for the present invention to solve the technical problems is: comprise left side fixed block, back-up block, right side fixed block, clamp base, trapezoidal voussoir, trapezoid block, rectangular parallelepiped block, described clamp base is rectangular groove type structure, in clamp base, left and right sides are inclined-plane, clamp base medial slope angle is identical with the bevel angle of fixed block side, left side, described back-up block is rectangular structure, back-up block is positioned at clamp base inner bottom part, and left side fixed block and right side fixed block are positioned at the two ends of clamp base inner bottom part back-up block; Trapezoid block and rectangular parallelepiped block lay respectively at the left side fixed block side relative with right side fixed block, and two trapezoidal voussoirs lay respectively at inside clamp base, and closely cooperate with clamp base, left side fixed block, right side fixed block.
Fixed block inclined-plane, left side and clamp base medial slope adsorb any one of graphite linings or BN powder body material.
Beneficial effect
The split type fixture for testing ceramic matric composite shear resistance that the present invention proposes, comprises left side fixed block, back-up block, right side fixed block, clamp base; Left side fixed block is the bevelled block structure of band, back-up block and right side fixed block are simple rectangular structure, clamp base is the bevelled groove structure of left and right sides band, left side fixed block, back-up block, right side fixed block are fixed in clamp base, the bevel angle of clamp base medial slope and fixed block side, left side is equal, and clamp base and left side fixed block, right side fixed block are closely fixed by trapezoidal voussoir; Test specimen is fixed in the space that the split type fixture of composition surrounds by the trapezoid block of the left and right sides and rectangular parallelepiped block.
Compared with prior art, when adopting the present invention to test the split type fixture test of ceramic matric composite shear resistance, reduce the impact of buckling effect on test findings, make experimental result more close to the true shear resistance of material, and the generation that the fixture caused because of stress raisers under effectively avoiding high temperature ruptures; When testing different composite material, not needing to select suitable intermediate layer material, using same fixture at a room temperature and a high temperature, during high temperature test, fixture is not easily damaged and sample is sustainable effectively fixing, and the fixture life-span improves greatly, has saved experimentation cost.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, a kind of split type fixture for testing ceramic matric composite shear resistance of the present invention is described in further detail.
Fig. 1 is the split type fixture schematic diagram that the present invention tests ceramic matric composite shear resistance.
Fig. 2 is left side of the present invention fixed-block-architecture (FBA) schematic diagram.
Fig. 3 is support block structure schematic diagram of the present invention.
Fig. 4 is right side of the present invention fixed-block-architecture (FBA) schematic diagram.
Fig. 5 is clamp base structural representation of the present invention.
Fig. 6 is trapezoid block structural representation of the present invention.
In figure:
1. fixed block 4. clamp base 5. trapezoidal voussoir 6. trapezoid block 7. rectangular parallelepiped block 8. test specimen on the right side of fixed block 2. back-up block 3. on the left of
Embodiment
The present embodiment is a kind of split type fixture for testing ceramic matric composite shear resistance.
Consult Fig. 1 ~ Fig. 6, the split type fixture of the present embodiment test ceramic matric composite shear resistance, is made up of left side fixed block 1, back-up block 2, right side fixed block 3, clamp base 4, trapezoidal voussoir 5, trapezoid block 6, rectangular parallelepiped block 7; Clamp base 4 is rectangular groove type structure, and in clamp base 4, left and right sides are inclined-plane, and clamp base 4 medial slope angle is identical with the bevel angle of left side fixed block 1 side.Back-up block 2 and right side fixed block 3 are rectangular structure, and back-up block 2 is fixed on clamp base 4 inner bottom part, and left side fixed block 1 and right side fixed block 3 lay respectively at the both sides of clamp base 4 inner bottom part back-up block 2; Trapezoid block 6 and rectangular parallelepiped block 7 are separately fixed at left side fixed block 1 side relative with right side fixed block 3, and two trapezoidal voussoirs 5 are arranged on inside clamp base 4 respectively, and closely cooperate fixing with clamp base 4, left side fixed block 1, right side fixed block 3.The inclined-plane of left side fixed block 1 inclined-plane and clamp base 4 adsorbs any one of graphite linings or BN powder body material.
The present embodiment fixture is split modular structure, and the space of placing test specimen is made up of jointly left side fixed block 1, back-up block 2 and right side fixed block 3.Be placed in the bevelled clamp base of band after combination, the fixture after combination is closely fixed by trapezoidal voussoir 5 by the inclined-plane, both sides of clamp base.Test specimen 8 is fixed in the space that the left side fixed block 1, back-up block 2, the right side fixed block 3 that form split type fixture surround by the trapezoid block of the left and right sides 6 and rectangular parallelepiped block 7.
The present embodiment for test 2D-C/SiC and 2D-C/SIBC compound substance high temperature face in cutting performance, the test specimen physical dimension of setup test is 30mm × 15mm × 3mm.
During the present embodiment test, first the left side fixed block 1 of split type fixture, back-up block 2 and right side fixed block 3 are placed in clamp base 4, test specimen 8 centering is placed on back-up block 2, left and right is fixed with trapezoid block 6 and rectangular parallelepiped block 7 respectively, with position, inclined-plane, both sides in clamp base 4 is placed respectively trapezoidal voussoir 5 and carries out fastening to left side fixed block 1, right side fixed block 3 and clamp base 4, by the test specimen installed and a whole set of fixture fixed be arranged on testing machine and carry out experimental test.Rely on the deadweight of trapezoid block 6 to clamp test specimen, prevent from bending; When the left side fixed block 1 of high temperature lower support and fixing test specimen, back-up block 2, right side fixed block 3 expand, power is delivered in clamp base 4 by trapezoidal voussoir 5, fixture is not easily ruptured because of stress raisers, improve the life-span of fixture; When utilizing trapezoidal voussoir 5 to ensure that fixture is out of shape, test specimen still can closely be fixed, and ensure that the correctness of test findings.
Following table is the actual tests result using fixture to carry out the test of 2D-C/SIC and 2D-C/SIBC in-plane shear strength.In-plane shear strength test under using fixture to carry out room temperature and high temperature, improves the success ratio of test and the accuracy of result to a certain extent.
Claims (2)
1. one kind for testing the split type fixture of ceramic matric composite shear resistance, it is characterized in that: comprise left side fixed block, back-up block, right side fixed block, clamp base, trapezoidal voussoir, trapezoid block, rectangular parallelepiped block, described clamp base is rectangular groove type structure, in clamp base, left and right sides are inclined-plane, clamp base medial slope angle is identical with the bevel angle of fixed block side, left side, described back-up block is rectangular structure, back-up block is positioned at clamp base inner bottom part, and left side fixed block and right side fixed block are positioned at the two ends of clamp base inner bottom part back-up block; Trapezoid block and rectangular parallelepiped block lay respectively at the left side fixed block side relative with right side fixed block, and two trapezoidal voussoirs lay respectively at inside clamp base, and closely cooperate with clamp base, left side fixed block, right side fixed block.
2. the split type fixture for testing ceramic matric composite shear resistance according to claim 1, is characterized in that: fixed block inclined-plane, left side and clamp base medial slope adsorb any one of graphite linings or BN powder body material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410487907.5A CN104237005B (en) | 2014-09-22 | A kind of split type fixture for testing ceramic matric composite shear strength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410487907.5A CN104237005B (en) | 2014-09-22 | A kind of split type fixture for testing ceramic matric composite shear strength |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104237005A true CN104237005A (en) | 2014-12-24 |
| CN104237005B CN104237005B (en) | 2017-01-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486578A (en) * | 2016-01-13 | 2016-04-13 | 中国科学院理化技术研究所 | Sample clamping device for measuring shearing force at low temperature |
| CN106914763A (en) * | 2015-12-24 | 2017-07-04 | 昌河飞机工业（集团）有限责任公司 | A kind of low stress fixture for metal specimen cutting test |
| CN107831070A (en) * | 2017-12-04 | 2018-03-23 | 长沙理工大学 | A kind of compression shear test device of composite pavement structure intensity and fatigue |
| CN107884286A (en) * | 2017-11-08 | 2018-04-06 | 哈尔滨工业大学 | A kind of sample and method of test compound material at high temperature shear strength |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05264424A (en) * | 1992-03-19 | 1993-10-12 | Ngk Insulators Ltd | Bending-strength testing jig |
| CN201449355U (en) * | 2009-07-14 | 2010-05-05 | 西北工业大学 | Clamper for testing shearing performance of a continuous fiber-reinforced composite |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05264424A (en) * | 1992-03-19 | 1993-10-12 | Ngk Insulators Ltd | Bending-strength testing jig |
| CN201449355U (en) * | 2009-07-14 | 2010-05-05 | 西北工业大学 | Clamper for testing shearing performance of a continuous fiber-reinforced composite |
Non-Patent Citations (2)
| Title |
|---|
| HIROSHI HATTA ET AL.: ""Strengths of C/C composites under tensile, shear, and compressive loading: Role of interfacial shear strength"", 《COMPOSITES SCIENCE AND TECHNOLOGY》 * |
| 王筠 等: ""FMS 的夹具系统"", 《组合机床与自动化加工技术》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106914763A (en) * | 2015-12-24 | 2017-07-04 | 昌河飞机工业（集团）有限责任公司 | A kind of low stress fixture for metal specimen cutting test |
| CN105486578A (en) * | 2016-01-13 | 2016-04-13 | 中国科学院理化技术研究所 | Sample clamping device for measuring shearing force at low temperature |
| CN107884286A (en) * | 2017-11-08 | 2018-04-06 | 哈尔滨工业大学 | A kind of sample and method of test compound material at high temperature shear strength |
| CN107884286B (en) * | 2017-11-08 | 2019-05-31 | 哈尔滨工业大学 | A kind of sample and method for testing composite material shear at high temperature intensity |
| CN107831070A (en) * | 2017-12-04 | 2018-03-23 | 长沙理工大学 | A kind of compression shear test device of composite pavement structure intensity and fatigue |
| CN107831070B (en) * | 2017-12-04 | 2024-04-09 | 长沙理工大学 | Compression shear testing device for structural strength and fatigue of composite pavement |
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