Cyclic shear fatigue testing machine

Abstract

The invention discloses a cyclic shear fatigue testing machine, which belongs to the field of material testing. The cyclic shear testing machine comprises a link base, a power rotating shaft, a rotating torque sensor, a test piece clamping mechanism and a test piece rotating angle collecting mechanism, wherein the power rotating shaft is fixedly connected with a speed reducer in the link base, and the rotating torque sensor is located above the link base and fixedly connected with the link base; the test piece clamping mechanism comprises an outer clamping mechanism and an inner clamping mechanism, the outer clamping mechanism and the inner clamping mechanism are located above the power rotating shaft and fixedly connected with the rotating torque sensor and the power rotating shaft respectively, and the test piece rotating angle collecting mechanism comprises a follow-up rotating shaft, a rotating disc, a reading wheel and an encoder. The follow-up rotating shaft is located above the inner clamping device and fixedly connected with the inner clamping device, the rotating disc is fixedly connected with the follow-up rotating shaft, and the reading wheel is located above the encoder. The machine is applied to a material fatigue test and solves the problem of cyclic shearing of plates.

Description

technical field [0001] The invention relates to the field of material shear fatigue performance testing, in particular to a cyclic shear fatigue testing machine. Background technique [0002] At present, in the field of practical engineering applications, metal materials are usually used as structural materials for load bearing, but during their service period, due to the dynamic load, especially the cyclic shearing action, the performance of the material is reduced and the service life is reduced. Therefore, the shear fatigue performance of the material under cyclic shear loading must be determined for the evaluation of the strength performance of the necessary structural details. [0003] For the cyclic shear fatigue performance test of materials, due to many interference factors in the test process, the accuracy of the test data is not high. In the testing test of the prior art, the commonly used method is to form the test piece and the test machine into an integral stru...

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Problems solved by technology

[0003] For the cyclic shear fatigue performance test of materials, due to many interference factors in the test process, the accuracy of the test data is not high

In the testing test of the prior art, the commonly used method is to form the test piece and the test machine into an integral structure, but due to the existence of the gap between the test sample and the test device, in the process of repeated loading, the application of the load is different from the actual The value does not match, which makes it have a greater impact on the accuracy of the test data, which is the main bottleneck of the material shear fatigue performance test

Therefore, the test method for cyclic shear fatigue performance of materials is also very limited and does not have universal applicability of materials

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