Fracture toughness testing device under low temperature high pressure hydrogen charged environment and method thereof

Abstract

The invention provides a fracture toughness testing device under a low temperature high pressure hydrogen charged environment. The device comprises a sealed box body and a tensile device. The tensiledevice is set on the sealed box body. The device also comprises a refrigeration assembly, a liquid pressurization assembly, an electrochemical assembly, a detection assembly and an industrial personalcomputer. The liquid pressurization assembly is used for supplying a high pressure electrolyte solution to the interior of the sealed box body. The refrigeration assembly is used for cooling the electrolyte solution. The electrochemical assembly is used for generating hydrogen on a surface of a tensile test sample. The detection assembly is used for detecting a pressure and a temperature in the sealed box body and an opening crack state of the tensile test sample. The industrial personal computer is used for controlling the refrigeration assembly, the liquid pressurization assembly, the electrochemical assembly and the tensile device through collection and analysis of information of the detection assembly. The device is used for testing fracture toughness under a low temperature high pressure hydrogen rich environment. A relatively systematical and complete testing scheme is formed. A low temperature high pressure hydrogen rich deep sea environment is effectively simulated. Reliability of final testing data is improved.

Description

technical field [0001] The invention relates to the technical field of material mechanics test devices, in particular to a fracture toughness test device and a method thereof under a low temperature and high pressure hydrogen charging environment. Background technique [0002] Titanium alloys are widely used in ships and ocean engineering because of their good corrosion resistance, weldability and high specific strength. After decades of development, the research and application level of China's marine titanium alloy has been greatly improved, and a relatively complete marine titanium alloy system has been formed, which can meet the requirements of ships, submarines and deep submersibles for different strength levels, and It can be applied to different service parts. However, if titanium alloy components are served in a low-temperature, high-pressure hydrogen-containing medium for a long time, the erosion of seawater and the cavitation erosion of high-velocity seawater will...

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Problems solved by technology

[0003] The Chinese patent proposes a test device for the fracture toughness of materials under normal pressure and high temperature electrochemical hydrogen charging environment, but it does not involve the low temperature and high pressure test environment

In addition, in the patent, a ring-shaped heating element is used on the outer ring of the circular platform to provide a water bath heating and heat preservation environment, but the heat exchange medium must first conduct heat transfer with the cylinder wall before it can conduct heat transfer with the gas in the environmental chamber. For high-pressure gas, the wall of the cylinder is often thick, so that the insulation medium in the jacket cannot effectively insulate the gas in the cylinder. The overall thermal efficiency of the structure is low, and the jacket will also dissipate heat along the outer wall, resulting in waste of heat.

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