Novel composite material unnotched compression test fixture

Abstract

The invention discloses a novel composite material unnotched compression test fixture which comprises a test loading module, a test clamping module and a strain measurement module, wherein the test loading module comprises a base, an end press plate, a clamp block cover plate, a guide shaft and a stroke control key; the test clamping module comprises a press piece, a clamp block and a clamp block guide pillar; the strain measurement module comprises an extensometer clamping piece and an extensometer support pillar. According to the novel composite material unnotched compression test fixture, the clamp block is driven to unclamp or clamp by the up and down movement of the base, and a test piece can be automatically aligned when being clamped by the clamp block; the alignment accuracy can be adjusted by introducing an extensometer and adjusting the screw pitches of threads in the strain measurement module; a series of strain measurement data with different accuracies are acquired, so that a strain measurement part capable of meeting the requirements of the different accuracies can be formed; the clamp block cover plate is assembled with the base by a bolt, so that a semi-open type structure can be formed in the clamping space of the test fixture, the test piece can be conveniently clamped, and the whole efficiency of the test is improved.

Description

technical field [0001] The invention belongs to the technical field of fiber-reinforced composite material testing, in particular to a novel composite material no-notch compression test fixture. Background technique [0002] Fiber-reinforced composites are widely used in modern aerospace structures, and a large part of the structural parts are subjected to compressive loads at relatively high temperatures, so a large part of the composite material needs to be compressed without notch before it is put into use test. [0003] The existing unnotched compression test fixture is the standard unnotched compression test fixture proposed by the American Society for Testing and Materials (ASTM) and the national standard test fixture proposed by the unidirectional fiber reinforced plastic flat plate compression performance test method (GBT3856-2005). The strain data measurement and collection methods are the strain gauge method or the extensometer method. [0004] However, the test ...

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Problems solved by technology

[0006] The purpose of the present invention is to propose a new type of composite material non-notched compression test fixture in order to solve the problems of low efficiency and difficulty in strain collection in the prior art.

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