A kind of calibration device and calibration method based on dcpd method crack growth signal

Abstract

The invention discloses a calibration device and a calibration method based on a DCPD method crack propagation signal. The calibration device includes a cavity, a cavity base and a plastic slice. The cavity is arranged on the top of the cavity base. The shape of the cavity is a cuboid structure. The cavity surrounded by the cavity wall of the body is a rectangular parallelepiped internal cavity. There are vertical gaps in the middle of the front wall and the rear wall. Scales are arranged on both sides of the gap along the length direction. The rectangular parallelepiped internal cavity is filled with liquid metal, plastic slices It can be inserted into the gap to cut liquid metal. The invention utilizes the property that liquid metal is liquid at room temperature and has a certain fluidity, and the cutting of liquid metal can intuitively and vividly simulate the crack expansion, and provides a reusable and intuitive method for the research and development of a crack monitoring instrument based on the DCPD method. The characterized method for simulating crack propagation signals has the advantages of stable performance and repeatable operation, and greatly reduces the manufacturing cost of crack monitoring instruments based on the DCPD method.

Description

technical field [0001] The invention belongs to the technical field of nuclear power structure safety analysis, and in particular relates to a calibration device and a calibration method based on a DCPD method crack propagation signal. Background technique [0002] In the field of nuclear power, the main key parts are in a high-temperature and high-pressure water environment, and the welded joints are prone to cracks due to stress corrosion. Monitoring the crack length and evaluating the life of mechanical parts is an important research technology field for saving nuclear power costs and reducing nuclear power safety accidents. In foreign countries, MTS company has developed a crack measurement system based on DCPD (direct current potential drop) method for fatigue crack growth measurement, and MATELECT company has developed a crack growth monitor using pulsed direct current technology to monitor metal samples in mechanical testing. Crack propagation. However, due to techni...

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Problems solved by technology

However, due to the slow growth rate of cracks in nuclear power parts in the nuclear power field, ranging from dozens of days to more than ten years, the experimental environment in the instrument development process is too long to be used as a signal when developing and testing instruments. source

Therefore, at present, the development of crack monitoring instruments based on DCPD method in China has not obtained stable performance, repeated use and effective crack growth signals to quantify and calibrate

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