Composite material low temperature performance test fixture assembly

Abstract

The invention relates to a material mechanical property testing apparatus and provides a composite material low temperature performance test fixture assembly. The fixture assembly comprises two fixtures having the same structures. The fixture comprises a clamping sliding block for clamping a sample, a driven sliding block for transmission of the vertical displacement, a transition sliding block for transmission of the horizontal displacement, a braking bolt for producing a braking force and a forced clamping bolt for forcibly clamping the sample. The two sides of the clamping sliding block are provided with teeth and bosses. The teeth of the two clamping sliding blocks are opposite. The driven sliding block is a raised part having a smooth slope as the top end. The transition sliding block is provided with a smooth slope fitting to the transition sliding block so that a friction pair is formed. The fixture assembly is suitable for low temperature tension and tensile fatigue mechanical tests on the fiber-reinforced composite material sample, can prevent slipping of the composite material at a low temperature and can prevent clamped section damage. In the experiment, along with increasing of test tension, the resistance to the fixture teeth is increased and the clamping force is improved so that the effect of clamping is further guaranteed.

Description

technical field [0001] The invention belongs to testing equipment for mechanical properties of materials, in particular to a clamp assembly used for tensile and fatigue tests of composite materials under low temperature environment. Background technique [0002] With its excellent specific strength, specific stiffness and good thermal resistance, fiber-reinforced composite materials have great application prospects and potential in low temperature fields (such as low temperature pressure vessels, low temperature environment supports, superconducting equipment, etc.). The mechanical performance parameters of composite materials at low temperature will change compared with those at normal temperature, which is mainly due to factors such as the matrix becoming brittle at low temperature and the thermal stress at the interface caused by the difference in thermal expansion coefficient between the matrix and the fiber. However, at this stage , due to factors such as the complexity...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the problem of sample slippage when the traditional experimental fixture is applied to the low temperature mechanical experiment of composite materials in the prior art, and propose a low temperature performance test fixture for composite materials

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