Compatibility evaluation method and system for material loaded based on constant displacement and high-pressure hydrogen

A technology of high-pressure hydrogen gas and evaluation method, which is applied in the direction of using stable tension/pressure to test the strength of materials, analyze materials, strength characteristics, etc. Stability, effect of reducing the risk of hydrogen leakage

Pending Publication Date: 2019-11-15
CHINA SPECIAL EQUIP INSPECTION & RES INST
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Problems solved by technology

[0004] For this reason, the embodiment of the present invention provides a method for evaluating the compatibility of materials and high-pressure hydrogen gas based on constant displacement loading, so as to solve the existing technologies such as difficult dynamic sealing and high test risk in the compatibility evaluation test of materials and hydrogen gas. difficult question

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  • Compatibility evaluation method and system for material loaded based on constant displacement and high-pressure hydrogen
  • Compatibility evaluation method and system for material loaded based on constant displacement and high-pressure hydrogen
  • Compatibility evaluation method and system for material loaded based on constant displacement and high-pressure hydrogen

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Embodiment 1

[0059] Such as figure 1 As shown, this embodiment proposes a method for evaluating the compatibility of materials with high-pressure hydrogen gas based on constant displacement loading. The method includes the following steps:

[0060] Step S110 , using the material to be tested to prepare a compact tensile sample and a bolt-loaded compact tensile sample.

[0061] Sample preparation and dimension measurement:

[0062] The test adopts compact tensile specimen (abbreviation: CT specimen, such as figure 2 shown) and modified bolt-loaded compact tensile specimens (referred to as: WOL specimens, such as image 3 As shown), the WOL sample can also be called the bolt-loaded CT sample. The difference between it and the CT sample is that the CT sample is loaded with a wedge block, while the WOL sample is loaded with a bolt. Before the test, the surface of the sample was degreased and derusted. The thickness B of the sample is a key parameter that needs to be determined. The select...

Embodiment 2

[0131] Corresponding to the above-mentioned embodiment 1, such as Figure 4 As shown, this embodiment proposes a material and high-pressure hydrogen compatibility test system based on constant displacement loading, which includes:

[0132] The sample preparation module 210 is used to prepare a compact tensile sample and a bolt-loaded compact tensile sample using the material to be tested.

[0133] The crack prefabrication module 220 is configured to perform fatigue crack prefabrication on the compact tensile specimen and the bolt-loaded compact tensile specimen respectively.

[0134] The loading module 230 is configured to load the compact tension sample with prefabricated fatigue cracks and the bolt loaded compact tension sample respectively.

[0135] The test module 240 is configured to place the loaded compact tensile sample and the bolt-loaded compact tensile sample respectively in a statically sealed high-pressure hydrogen environment for a period of time for testing.

...

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Abstract

Embodiments of the invention disclose a compatibility evaluation method and system for a material loaded based on constant displacement and high-pressure hydrogen. Based on a fracture mechanics theory, a compatibility test method for the material in a static seal isolation environment and the high-pressure hydrogen is carried out by adopting a compact tension specimen (CT specimen) and a bolt loaded compact tension specimen (WOL specimen); through the test method, the crack hydrogen induced cracking sensitivity of the specimen material in the constant displacement loading state and a criticalstress intensity factor value KIH of the bolt loading compact tension specimen in a high-pressure hydrogen environment can be measured; material parameters obtained according to the method disclosed by the invention not only can be used for measuring the applicability of the material in the high-pressure hydrogen environment, but also can provide necessary design parameters for the design and manufacture of hydrogen environment service equipment; and a test process can be remotely monitored, so that the test personnel can be prevented from being in close contact with the hydrogen high-pressuretest device, and the test risk is reduced.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of testing and characterization of mechanical properties of materials, and in particular to a method and system for evaluating the compatibility of materials and high-pressure hydrogen based on constant displacement loading. Background technique [0002] As an emerging energy source in the future, hydrogen has the advantages of wide sources and non-polluting emissions. Hydrogen production, storage and transportation, hydrogenation and other equipment in direct contact with hydrogen are key equipment for the development of hydrogen energy, and their safety is becoming more and more important. Metal materials, non-metallic materials and hydrogen used in hydrogen storage and transportation equipment Hydrogen embrittlement occurs after exposure, and is more pronounced in high-pressure hydrogen. For this reason, before the design and manufacture of hydrogen production, storage and trans...

Claims

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Application Information

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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0003G01N2203/0017G01N2203/0067G01N2203/0073
Inventor 翟建明商学欣于海洋孙永辉张雪涛王汉奎宋明桂乐乐徐彤
Owner CHINA SPECIAL EQUIP INSPECTION & RES INST
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