A fixture for high temperature tensile test of extremely low modulus composite material and its test method

Abstract

The invention provides a high-temperature tension test clamp and method of an ultra-low-modulus composite material. The high-temperature tension test clamp comprises an upper tension unit and a lowertension unit. Each tension unit comprises a U-shaped clamp body, a gasket, tightening screws, a baffle and a pre-tightening screw. The high-temperature tension test clamp has the advantages that by means of the clamp, a test sample can be freely expanded in the heating process, the thermal stress influence is eliminated, and therefore, the accuracy of a test result is improved; the clamp is connected with the test simple in an arc end face loading suspension mode, the stress of the loading end of the test sample is uniform, and when the test sample is tensioned, it is avoided that the loadingend is damaged first; a flat test sample is positioned by using the gaskets, the flat test sample clamping stability is ensured, and the test failure probability is reduced; plate test samples which are equal in thickness are adopted, processing is convenient, and the economical efficiency is high. The clamp is made from a high-strength and high-temperature-resistance material. The clamp can be suitable for tension tests of a high-temperature material weak in tensile strength.

Description

technical field [0001] The invention relates to a fixture used for a high-temperature tensile test of an ultra-low modulus flat composite material and a test method thereof, belonging to the technical field of composite material test devices. Background technique [0002] The test equipment for high temperature tensile mechanical properties of materials mainly connects the existing testing machine host with the high temperature environment furnace, installs the tensile sample in the high temperature environment furnace, and then heats the sample through the high temperature environment furnace control system, and passes the test. The main machine of the machine loads the sample to obtain the fracture mechanical properties such as tensile modulus and tensile strength of the material under high temperature environment. Very low modulus materials (such as foam materials) have low tensile modulus (less than 1GPa), low tensile strength (less than 1MPa), the special mechanical pro...

AI Technical Summary

Problems solved by technology

If the solution of clamping the sample at room temperature is directly adopted, the extremely low modulus composite material is easily damaged at the clamping end, and during the heating process, the thermal deformation mismatch between the sample and the fixture will generate thermal stress inside the sample , which seriously affects the accuracy of the test results, and even the sample is destroyed before the test

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