Calibration device and calibration method of water-bathing method crack growth signal

Abstract

The invention discloses a calibration device and calibration method of a water-bathing method crack growth signal. The calibration device is applied to calibrating a crack growth signal of a crack monitoring instruction based on a DC potential fall method. The calibration method comprises the following steps: importing constant current at two ends of a metal conductor, collecting a voltage difference signal of the metal conductor under twice temperature, and calibrating the voltage difference signal as the crack growth signal with of the corresponding crack growth length according to a conclusion that the voltage difference signal can be used as an analog crack growth signal about 1mm crack growth of a 304 steel sample when the temperature of the metal conductor is 1 DEG C increased. The localization progress of the related instrument is accelerated, an efficient, simple and fast calibration device and method are provided for verifying the function and precision of the instrument, a relation between the 304 steel crack length and the measurement voltage signal is published, the applicable range of the instrument can be popularized in an acceleration way, and the calibration devicehas the advantages of being simple in structure, stable in performance, repeated in use and intelligent in control.

Description

Technical field [0001] The invention belongs to the technical field of nuclear power structure safety analysis, and specifically relates to a calibration device and a calibration method for a water bath 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 their welded joints are prone to cracks due to stress corrosion. Monitoring the length of the cracks and evaluating the life of mechanical parts are important research fields for saving nuclear power costs and reducing nuclear power safety accidents. Abroad, MTS company has developed a crack measurement system based on the DC potential drop method for fatigue crack growth measurement, and MATELECT has developed a crack growth monitor using pulsed DC technology to monitor the crack growth of metal specimens in mechanical testing. However, due to technical confidentiality and other reasons, there are relat...

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Problems solved by technology

However, since the growth rate of cracks in nuclear power parts in the nuclear power field is very slow, ranging from tens of days to more than ten years, the period of realization of the experimental environment in the process of instrument development is too long, and it is not suitable for the development of testing instruments. signal source

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

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