Device for calibrating crack expansion signals in water bath method

Abstract

The invention discloses a device for calibrating crack expansion signals in a water bath method. The device comprises a base, a metal conductor, a fan, a vacuum flask and a temperature control devicewhich is capable of setting and displaying the temperature of water in the vacuum flask and giving an alarm when the temperature of the water exceeds the set temperature, the vacuum flask comprises aflask body and a flask cap positioned on the upper portion of the flask body, a temperature sensor used for measuring the water temperature of the flask body and a heating resistance wire used for heating water in the flask body are arranged on the inner wall of the flask body, and the temperature sensor, the heating resistance wire and the fan are all connected with the temperature control deviceand are controlled to work by the temperature control device. According to the device for calibrating crack expansion signals in a water bath method in the invention, the localization process of related instruments is accelerated, an efficient, simple and rapid calibration device is provided for verifying the functions and precision of the crack monitoring instrument, the relation between the length of the 304 steel crack and the measurement voltage signal is disclosed, accelerated promotion of the application range of the instrument is facilitated, and the advantages of being simple in structure, stable in performance, capable of being repeatedly used and intelligently controlled, and the like are achieved.

Description

technical field [0001] The invention belongs to the technical field of safety analysis of nuclear power structures, and in particular relates to a calibration device for crack propagation signals by a water bath method. 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 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 samples in mechanical testing. However, due to technical confidentiality and other reasons, there are relatively...

AI Technical Summary

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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