Anti-instability clamp for composite material tapping tensile compression fatigue test

Abstract

The invention belongs to the technical field of composite material mechanical property detection, and discloses an anti-instability clamp for a composite material tapping tensile compression fatigue test, the anti-instability clamp comprises a first protection clamp plate and a second protection clamp plate, the specifications of the first protection clamp plate and the second protection clamp plate are consistent, the two side walls of the first protective clamping plate and the two side walls of the second protective clamping plate are each integrally provided with a protruding block, screwholes are formed in the upper surface walls of the protruding blocks, and adjusting bolts are connected to the interiors of the screw holes in a screwed mode.The anti-instability clamp designed by theinvention can be used for protecting the working section of a sample and is fixed on two sides of the middle part of the sample; the test sample can be directly mounted and clamped on a testing machine, so that the whole clamp is more convenient to mount, the protective clamping plates play a role in protecting the test sample and preventing the test sample from instability, the Teflon film playsa role in reducing friction force, the temperature rise speed can be effectively reduced, and in addition, the clamping state between the fixture and the test sample can be adjusted by the adjustingbolt.

Description

technical field [0001] The invention belongs to the technical field of mechanical property detection of composite materials, and in particular relates to an anti-instability fixture used for composite material opening tensile and compression fatigue tests. Background technique [0002] In the process of tensile-compression fatigue test and compression-compression fatigue test of composite material open-hole samples, since the sample is in the shape of a thin plate, if there is no auxiliary fixture, it will often appear unstable during the compression process, thus As a result, the sample is directly broken. In the existing test, the sample is generally fixed in the test fixture as a whole, and then the hydraulic head is used to clamp the fixture as a whole for the test. [0003] In the traditional fixture test, the fixture and the sample are jointly clamped on the hydraulic chuck of the testing machine. Usually, in order to meet the requirements of the test load, the clampin...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide an anti-instability fixture for tensile and compression fatigue tests of composite materials, so as to solve the problem that there is a large friction force between the traditional sample and the fixture in the above-mentioned background technology, which will easily lead to the temperature rise of the sample. Obvious problem, in addition, traditionally need to customize a special clamp block to install the clamp, which increases the cost of testing

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