Flat specimen high-temperature tension-compression fatigue test clamp and method

Abstract

The invention discloses a flat specimen high-temperature tension-compression fatigue test clamp and method. The clamp and method implement clamping on the flat specimen in a high-temperature test, so that the flat specimen can be subjected to the tension-compression test under high-temperature conditions. A fatigue machine hydraulic clamping head clamps an optical rod end of a central shaft and is connected with a connecting rod through a sleeve, and the central shaft is provided with a fixing nut which is used for restricting the downward displacement of the sleeve; the connecting rod is fixed with the sleeve through a screw; the connecting rod is connected with a wedge clamp body through threads; the central shaft penetrates through a through hole in the middle of the connecting rod, and the shaft end is connected with a guide table; the guide table is positioned in a groove between two wedge clamping bodies, and used for guiding the wedge clamping blocks to move up and down; the specimen is clamped by the wedge clamping blocks in the wedge clamp body, the bottoms of the wedge clamping blocks are abutted by the top end of the guide table, and both ends contact the wedge surface inside the wedge clamp body so as to restrict the upward displacement of the clamping blocks; and the top ends of locking threads extending from threaded holes on both sides of the wedge clamp body contact the square clamping blocks, so that the square clamping blocks abut against both sides of the clamp blocks, thereby restricting the downward displacement of the wedge clamping blocks.

Description

technical field [0001] The invention relates to metal material fatigue performance test equipment, in particular to a high-temperature tension-compression fatigue test fixture and method for flat specimens, and belongs to the field of design and manufacture of metal material uniaxial high-temperature tensile fatigue test fixtures. Background technique [0002] For test requirements that require repeated tension and compression, such as dynamic and static universal fatigue tests, ordinary wedge-shaped fixtures cannot meet the test requirements, because this kind of fixture can only bear the tensile force in one direction and cannot bear the reverse compression test force, otherwise the specimen will be loosened. After reviewing the existing patent literature, no high-temperature fixture for flat specimens that can solve the above problems has been found. Therefore, it is necessary to design a high-temperature tension / compression fatigue test fixture suitable for flat specimen...

AI Technical Summary

Problems solved by technology

The design of the fixture cannot meet the requirements of applying compressive load, and the influence of high temperature test conditions is not considered

[0007] In summary, the existing technology cannot meet the requirements of tensile / compression fatigue test of flat specimens under high temperature conditions

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