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

A crack propagation and calibration device technology, applied in the field of safety analysis of nuclear power structures, can solve problems such as long implementation period, slow crack growth rate, unsuitable signal source, etc.

Active Publication Date: 2019-06-11
XIAN UNIV OF SCI & TECH
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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 suitabl

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

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Embodiment Construction

[0054] The principle of the direct current potential drop applied in the crack monitoring instrument based on the direct current potential drop is: the potential drop method is a method of measuring the crack length based on the conductive characteristics of the metal material itself. Such as Picture 10 with Picture 11 As shown, in the sample with cracks, the current field is a function of the sample geometry, especially the size of the crack. When a constant current is passed through the sample, the potential will increase with the increase of the crack length in the sample. The potential drop method is generally implemented with a four-probe method. The outer two probes (C1, C2) are current electrodes, the excitation current I passes through the tested sample from the outer two probes, and the inner two probes (P1, P2) are the voltage V (Potential difference) electrode, the potential difference depends on the current distribution in the sample.

[0055] In order to determine ...

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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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Application Information

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IPC IPC(8): G01N27/00
Inventor 薛河张亮倪陈强苟思育魏其深李岗博徐鹏超
Owner XIAN UNIV OF SCI & TECH
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