Stretch-twist combined fixture based on forward thread structure and reverse thread structure

Abstract

The invention relates to a stretch-twist combined fixture based on a forward thread structure and a reverse thread structure and belongs to the field of material testing technologies. Through the combined fixture, reliable clamping of a sample can be completed in quasi-static and high-frequency dynamic stretch-twist combined loading material tests, and high-frequency dynamic loading includes but not limited to zero-crossing loading. The combined fixture comprises a fixture shell part, a clamping part and an expansion part, wherein the rear end of a fixture cup seat in the shell part is connected with a stretch-twist combined sensor through a flange; the clamping part is composed of two nuts which are unequal in diameter and opposite in rotating direction, and the clamping part is connectedwith the fixture cup seat through a flat key pair and the expansion part; and the expansion part is used for adjusting the locking degree of the inner-end nut. The combined fixture has the advantagesthat the sample can be clamped in a mechanical connection mode under quasi-static and high-frequency dynamic stretch-twist combined loading conditions; and the combined fixture is good in universality, low in cost and convenient to maintain and further has an important prospect of application in extremely high and low-temperature environments and a limited space.

Description

technical field [0001] The invention relates to the technical field of material testing, in particular to a tension-torsion composite fixture based on positive and negative thread structures, which can be applied to the coupling of two mechanical forms of tension and torsion or quasi-static or high-frequency dynamic loading of a single load test. Background technique [0002] Engineering materials often bear many different forms of mechanical loads at the same time under actual service conditions. With the development of material testing technology and the improvement of material testing requirements in practical engineering applications, traditional single-load material performance testing machines and some supporting instruments and equipment have been Unable to meet the increasingly rich material testing requirements, a series of multi-load multi-physics field coupled material testing test instruments came into being. Common test fixtures are divided into hydraulic fixtu...

AI Technical Summary

Problems solved by technology

The hydraulic clamp compresses the sample through the wedge block to achieve clamping. After modification, it can also be used for tension-torsion composite test and fatigue test, but its disadvantages such as high cost, many auxiliary components, and difficult maintenance have been difficult to improve. In physical fields such as high temperature, extremely low temperature, strong electricity, and strong magnetism, hydraulic fixtures are often constrained by the environment and cannot meet the use requirements at all.

However, there are very few mechanical fixtures that can achieve clamping under composite mechanical loads, especially those that can be applied to high-frequency zero-crossing load loading tests

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