A high-pressure hydrogen-doped natural gas environmental material performance damage evaluation device

Abstract

The invention relates to a material mechanical property test device, and aims at providing a material performance damage evaluation device in a high-pressure hydrogen-doped natural gas environment. The device comprises a gas cylinder set, a gas path system and a test environment box; a vertical cavity channel is formed in the upper center of the test environment box and a loading shaft is s inserted in the cavity channel; a countersink is correspondingly formed in the lower center of the test environment box; the edge of a sample is clamped between the upper box body and lower box body; a steel ball is placed at the center of the upper surface of the sample and a bidirectional strain gauge is arranged at the center of the lower surface of the sample; and the test environment box is connected with the gas path system through the inlet and exhaust ports of the test environment box. According to the device, a method of applying a load to a disk slice sample through pushing the steel ballby utilizing the loading shaft is adopted, so that a complicated servo test mechanism is avoided, the equipment volume is decreased and the cost is reduced; the using of a high-pressure motive seal element is avoided, so that the probability of hydrogen leakage is reduced and the reliability and safety of the device is improved; and the fatigue failure of the disk slice sample is accelerated through increasing the force application frequency of the loading shaft, so that the test time is shortened and the test efficiency is improved.

Description

technical field [0001] The invention belongs to material mechanical performance testing equipment, in particular to a high-pressure hydrogen-doped natural gas environmental material performance damage evaluation device and a device. 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...

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 environment 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, and the frequency of force applied to the loading shaft in the constant pressure fatigue test is low , resulting in high cost of test time, and each test requires multiple people to operate the equipment, and the cost of test labor is high

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