Test method for delayed fracture of materials in high-pressure hydrogen-doped natural gas environment

Abstract

The invention relates to a technology for testing mechanical properties of materials, and aims at providing a material delayed fracture test method under high-pressure hydrogen-doped natural gas environment. According to the method, a steel ball is pushed through a loading shaft so as to apply a load on a disk slice sample, and the other side of the disk slice sample is in contact with high-pressure hydrogen-doped natural gas, so that the disk slice sample suffers the effect of the load while being in contact with the high-pressure hydrogen-doped natural gas; and data obtained by carrying outa delayed fracture test can be used for evaluating the performance damages of materials under the high-pressure hydrogen-doped natural gas environment. According to the method, a complicated servo test mechanism is avoided so that the equipment volume is decreased and the cost is reduced; the hydrogen leakage probability is reduced and the reliability and safety of the device are improved; the test time is shortened so that the test efficiency is improved; the test temperature requirement is satisfied and the influences, on hydrogen embrittlement, of temperature are tested; the accurate matching of hydrogen / natural gas mixed gas is realized; and a hydrogen concentration detection device is utilized to carry out hydrogen leakage detection, so that judgement can be conveniently carried out to determine whether the disk slice sample is broken or not.

Description

technical field [0001] The invention belongs to the testing technology of material mechanical properties, in particular to a material delayed fracture test method under high-pressure hydrogen-doped natural gas environment. Background technique [0002] With the continuous optimization of my country's energy structure, renewable energy is developing rapidly. Although renewable energy represented by wind energy and solar energy is developing rapidly, the intermittent and unpredictability of wind / solar power generation limits its large-scale integration into the main power grid, especially the uneven distribution of wind / solar geographical resources in my country has led to The separation of the power generation center and the load center has caused serious "wind curtailment and power restriction" for its large-scale application. According to the statistics of the National Energy Administration, in 2017 alone, my country's curtailed wind and photovoltaic power reached 41.9 bill...

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 the frequency of force application by the loading axis is low, resulting in high test time and cost, and each test requires multiple people to operate the equipment. high labor cost

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