Cryogenic environment material mechanical performance detection test device

Abstract

Relating to the field of material mechanical performance testing, the invention aims to provide a cryogenic environment material mechanical performance detection test device. The device comprises a testing machine control system, a data detection system, a low temperature and constant temperature system, and a testing machine main body. The testing machine control system includes an electronic servo controller connected to a computer. The testing machine main body consists of a hydraulic source and a double-column rack. There exist two sets of mutually switchable low temperature and constant temperature systems, i.e. a liquid nitrogen gasification refrigeration system and a liquid nitrogen direct refrigeration system. With the device, material stretching and fatigue tests under a temperature ranging from normal temperature to minus 185DEG C can be realized. Switching between the two modes of liquid nitrogen gasification refrigeration and liquid nitrogen direct refrigeration can be realized conveniently. And the device has the advantages of large test temperature range and high detection accuracy, etc.

Description

technical field [0001] The invention relates to the field of testing the mechanical properties of materials, in particular to a test device for testing the mechanical properties of materials in a cryogenic environment. Background technique [0002] The mechanical properties of materials in cryogenic environments are a focus of attention in industries such as aerospace, superconductivity, chemicals, and energy storage and transportation. The influence of cryogenic environment on the mechanical properties of materials and its mechanism are very complex. Taking the common austenitic stainless steel materials in cryogenic engineering and pressure equipment industry as an example, low temperature will have an impact on its mechanical properties such as strength, toughness and fatigue. The mechanism of its influence is not yet clear, and it may include the reduction of material dislocation activation energy at low temperature and the influence of factors such as stacking fault ene...

AI Technical Summary

Problems solved by technology

There are also some testing machines that can perform tests in a liquid nitrogen environment, but they can only use beam displacement control, and the test capacity is limited

In addition, it is difficult to combine the fatigue function of the low-temperature environment chamber and the testing machine

Therefore, the existing cryogenic material testing equipment cannot meet the requirements of tensile and fatigue testing of cryogenic environment materials in terms of test temperature range, control and detection accuracy.

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