Corrosion fatigue crack propagation testing device with high-temperature high-pressure circulating water and application

Abstract

The invention belongs to the field of material environmental fatigue experiments, particularly relates to a corrosion fatigue crack propagation testing device with high-temperature high-pressure circulating water and application and aims to solve the problem of in-situ accurate measurement of fatigue crack length and rate in a high-temperature high-pressure water environment. The device is provided with a high-temperature high-pressure water corrosion fatigue crack propagation testing system, a high-temperature high-pressure water circulating system, a high-pressure kettle and a fatigue machine. The high-temperature high-pressure water circulating system is connected with the high-pressure kettle to form a circulating circuit, a CT (compact tension) specimen is connected with a loading portion of the fatigue machine, and the high-temperature high-pressure water corrosion fatigue crack propagation testing system is connected with the CT specimen through a wire and comprises a computer,a nanovolt micro-ohmmeter, a data acquisition switch unit, a direct-current power source, a GPIB board card, a compression seal part and direct-current potential drop testing software. In-situ accurate measurement of fatigue crack length of the CT specimen in the high-temperature high-pressure water environment can be realized.

Description

technical field [0001] The invention belongs to the field of material environment fatigue experiments, more precisely, relates to a corrosion fatigue crack growth test device with high temperature and high pressure circulating water and its application, the test device is used for the fatigue of materials in the simulated nuclear power high temperature and high pressure water environment Crack growth test. Background technique [0002] The damage tolerance method in fatigue design has been widely used in aerospace, electric power, petrochemical and other fields. The basis of the damage tolerance method is the fatigue crack growth law of the material. When the material is served in a harsh environment, the environment-promoted fatigue cracking effect is very important, and the fatigue crack growth rate of the material in the service environment needs to be used as the design basis. In the field of nuclear power, for example, the pressure boundary key equipment (such as: pres...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a corrosion fatigue crack growth test device with high temperature and high pressure circulating water and its application, which can evaluate the corrosion fatigue crack growth rate of materials in a high temperature and high pressure water environment, and solve the maintenance difficulties and complex structures in the prior art , The operation of the instrument is cumbersome, and the crack length measurement equipment in the conventional air cannot be used in the high temperature and high pressure water environment.

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