Multifunctional differential pressure high pressure hydrogen and material compatibility test device

Abstract

The invention relates to the development field of testing equipment for mechanical properties of materials, and aims to provide a multifunctional differential pressure type high-pressure hydrogen and material compatibility testing device. The multifunctional differential pressure high-pressure hydrogen and material compatibility test device includes a test chamber, a pneumatic booster pump, a low-pressure storage tank, a high-pressure storage tank, a vacuum pump, a hydrogen cylinder set, an argon cylinder set, and a control system module. The mechanical properties of the disk specimens were tested in a high-pressure hydrogen environment. The present invention uses the pressure difference between the upper and lower surfaces of the disk sample to apply load to the disk sample, avoiding the complicated servo test mechanism, greatly reducing the volume of equipment, reducing equipment investment, easy operation, and improving test efficiency; and During the test, parameters such as strain and displacement of the disk sample can be measured conveniently, and the corresponding test components are not affected by high-pressure hydrogen.

Description

technical field [0001] The invention relates to the field of development of material mechanical performance testing equipment, in particular to a multifunctional differential pressure type high pressure hydrogen and material compatibility testing device. Background technique [0002] Hydrogen is an important part of the clean utilization of fossil energy and the development of new energy. Hydrogen is usually stored and transported in gaseous form under high pressure. In recent years, due to the development trend of higher pressure of high-pressure hydrogen system and complex service environment, the compatibility problem of materials used in high-pressure hydrogen system and hydrogen (ie hydrogen embrittlement problem) has gradually become prominent. Hydrogen embrittlement will reduce the toughness of the material and increase the crack growth rate, which will cause a sudden and serious failure of the high-pressure hydrogen system during service, causing great hidden danger...

AI Technical Summary

Problems solved by technology

[0004] (1) The equipment structure is complicated, the cost is high, and the operation is complicated

[0005] Most of the hydrogen compatibility test devices currently developed are based on traditional material testing machines, plus an environment box that can provide a high-pressure hydrogen environment. The samples and their fixtures are contained inside the environment box. Therefore, the internal volume of the environment box Large, coupled with its usually high pressure (up to 100MPa), resulting in expensive equipment

In addition, a large-volume environmental chamber also needs to be equipped with a corresponding hydrogen gas supply system. The operation of the entire equipment is complicated, and the cost of hydrogen and labor is high.

Such as the test device proposed in the patent [201110259252.2], not only the cost of the equipment itself is high, but each test requires multiple people to operate the equipment, and the hydrogen consumption is also large

[0006] (2) There is a high-pressure hydrogen pneumatic sealing structure, which is prone to leakage

Practice has shown that the existing dynamic seal structure has a very short service life, and often fails suddenly due to wear and hydrogen dissolution and expansion after a short period of use, resulting in hydrogen leakage and posing a major safety hazard

[0008] (3) It is difficult to measure various parameters of the sample in a high-pressure hydrogen environment

[0009] In a high-pressure hydrogen environment, due to the influence of hydrogen on the measuring elements such as sample strain and force, the signal will drift seriously, resulting in inaccurate measurement

[0010] (4) There is a big difference between the stress state of the sample and the stress state of the actual component

However, the existing testing machines usually test the failure behavior of samples under unidirectional stress, and there is still a certain gap between them and the actual service conditions of components.

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