Mechanical performance test clamp for polymer material in high-low-temperature environmental box

Abstract

The invention provides a mechanical performance test clamp for a polymer material in a high-low-temperature environmental box. The mechanical performance test clamp aims at solving the problems that an existing mechanical clamp cannot reliably clamp a sample in the high-low-temperature environmental box, the clamp is loosened at high and low temperature, and the sample slips. The mechanical performance test clamp comprises a cylindrical fork type clamp body 4, an arc-shaped clamping block 3, a fixing socket head cap screw 5, a positioning socket head cap screw 1 and a positioning gasket 6. The radius of the arc-shaped clamping block 3 is the same as the radius of the fillet of a tested piece. The positioning arc of the arc-shaped clamping block extrudes the sample to form tension. In order to eliminate motion of the sample in the radial direction of the clamp body, the sample is fixed through the positioning gasket. The pretightening effect is better than that of a common mechanical chuck for providing tension through friction force of the chuck on the sample, clamping is more continuous and stable, and operation is easier and more convenient. The arc-shaped clamping block and the clamp body are designed in a detachable mode, and aiming at sample pieces with different tension degrees, the universality of the tension clamp can be achieved only by replacing the arc-shaped clamping block. The clamp is suitable for multiple occasions, the sample piece cannot be damaged, and use is convenient.

Description

technical field [0001] The invention belongs to fixtures in measurement technology, and in particular relates to a fixture for testing mechanical properties of polymer materials in a high-low temperature environment box, especially suitable for tensile tests of polymer composite materials under low temperature and high temperature conditions, and can overcome test conditions. The phenomenon of loading and slipping of samples in low temperature environment can be improved, and the test accuracy can be improved. It belongs to the field of testing the mechanical properties of polymer composite materials. Background technique [0002] Under normal temperature conditions, hydraulic fixtures are generally used to test the tensile mechanical properties of polymer composite materials, and hydraulic components are used instead of pure mechanical structures to realize the automatic positioning, support and clamping functions of the workpiece. This type of fixture can not only bear a ...

AI Technical Summary

Problems solved by technology

However, due to the shrinkage of the sample and the fixture at low temperature, the initial clamping force becomes smaller, which easily causes slipping between the sample and the fixture, and increases the test error; due to the particularity of the polymer composite material itself, the hole Stress concentration is prone to occur at the place, causing the material here to be destroyed first, therefore, the method of punching and pinning cannot be adopted (such as the disclosed structure of CN104440652A)

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