Single-loading damage test method for materials under high-pressure hydrogen-doped natural gas environment

Abstract

The invention relates to a material mechanical property testing technology, and aims to provide a single-load damage test method for a material in a high-pressure hydrogen-doped natural gas environment. According to the single-load damage test method, a loading shaft is controlled to apply a load on a disc sheet sample continuously at a constant strain rate until the disc sheet sample is broken, thus the test of single-load ultimate pressure of the disc sheet sample is realized, the tested single-load ultimate pressure is compared with single-load ultimate pressure of the disc sheet sample inan argon atmosphere, so as to obtain a single-load damage index of the disc sheet sample, and the obtained data is used for evaluating performance damage of the material in the high-pressure hydrogen-doped natural gas environment. The single-load damage test method avoids the complicated servo test mechanism, greatly reduces the size of equipment, reduces the cost of equipment, can shorten the test time, greatly improves the test efficiency, ensures that the temperature is kept constant during the test process and satisfies the test temperature requirements, can realize precise proportion of ahydrogen / natural gas mixture, and is convenient to determine whether the disc sheet sample is broken by conducting hydrogen leak detection.

Description

technical field [0001] The invention belongs to the testing technology of mechanical properties of materials, in particular to a single-loading damage test method of materials under high-pressure hydrogen-doped natural gas environment. Background technique [0002] Hydrogen is produced by excess wind power or photoelectric electrolysis, and the hydrogen is mixed with natural gas to form hydrogen-doped natural gas (HCNG), which is then transported by the existing natural gas pipeline network, and finally used as transportation fuel, power generation fuel and clean gas , is considered to be an effective way to solve the problem of large-scale wind / photovoltaic consumption, which can bring good environmental benefits while improving the utilization rate of renewable energy, and has broad application prospects. However, unlike the physical and chemical properties of natural gas, high-pressure hydrogen will degrade the mechanical properties of metal materials and cause hydrogen d...

AI Technical Summary

Problems solved by technology

[0004] (1) The equipment structure is complex and there are potential safety hazards

[0005] Most of the existing testing devices for mechanical properties of materials in a pure hydrogen environment are transformed from traditional material testing machines, that is, an environmental chamber that can provide the pure hydrogen environment required for the test is installed on the traditional material testing machine. In order to accommodate the samples and their fixtures, The internal volume of the environmental chamber is usually designed to be large, which leads to a large volume and wall thickness of the environmental chamber, a complex overall structure of the equipment, and high cost

There are many flammable and explosive media stored in the environmental chamber, and the existing devices rely on the loading shaft passing through the environmental chamber of the testing machine to apply load to the clamped sample, and a dynamic sealing structure is often designed between the loading shaft and the contact surface of the environmental chamber To maintain the pressure inside the test chamber, however, the service life of the dynamic sealing structure is limited, it is easy to cause medium leakage, and there is a great potential safety hazard

[0006] (2) Low test efficiency and high time cost

[0007] The existing high-pressure hydrogen-doped natural gas environmental material performance damage device is slow to apply pressure load to the clamped sample, and cannot quickly realize a single loading test on the sample, resulting in high test time and cost, and each test requires more Humans operate the equipment, and the labor cost of the test is high

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