Crack propagation signal calibration device and method based on DCPD method

Abstract

The invention discloses a crack propagation signal calibration device and method based on a DCPD method. The crack propagation signal calibration device comprises a cavity body, a cavity body base anda plastic slice, the cavity body is arranged at the top of the cavity body base, the shape of the cavity body is of a cuboid structure, a cavity enclosed by cavity walls of the cavity body is a cuboid inner cavity, gaps are vertically formed in the middle of the front wall and the middle of the rear wall correspondingly, scales are arranged on the two sides of the gaps in the length direction correspondingly, the cuboid inner cavity is filled with liquid metal, and the plastic slice can be inserted into the gaps to cut the liquid metal. According to the crack propagation signal calibration device and method based on the DCPD method, the condition that the liquid metal is cut to be capable of simulating crack propagation intuitively and vividly through the liquid state of the liquid metalat the normal temperature and the performance of certain fluidity of the liquid metal is utilized, an intuitive representational method for simulating crack propagation signals is provided for researching and developing a crack monitoring instrument based on the DCPD method, wherein the method can be used repeatedly, the advantages of stable performance and repeatable operation are achieved, and the manufacturing cost of the crack monitoring instrument based on the DCPD method is greatly lowered.

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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