Metal component stress measurement method and metal component stress measurement system based on eddy current impedance

Abstract

Disclosed are a metal component stress measurement method and a metal component stress measurement system based on eddy current impedance. The system comprises an eddy current transducer, a measurement circuit, a signal generation and acquisition device and an upper computer, wherein the special eddy current transducer is fixed on a metal component, the measurement circuit and the signal generation and acquisition device are used for measuring and acquiring impedance of the eddy current transducer, and the upper computer is used for calibration equation analysis and stress conversion. The measurement circuit, the signal generation and acquisition device and the upper computer are used for characteristic voltage signal measurement, impedance calculation and stress conversion, an eddy current transducer equivalent circuit is serially connected with a voltage-dividing resistor to form an RL (resistor-inductor) circuit, and the measurement circuit and the signal generation and acquisition device achieve rapid measurement of voltages UR at two ends of the voltage-dividing resistor and combine excitation signals Ui, inputted from the signal generation and acquisition device to the RL circuit, to obtain the impedance Z of the eddy current transducer via a signal frequency spectrum and impedance calculation module of the upper computer, wherein the impedance Z satisfies that Z=R(Ui / UR-1).

Description

technical field [0001] The invention belongs to the electromagnetic measurement method and technical field of stress-strain of metal components, and its function is to use eddy current electrical impedance to quickly and non-destructively measure the stress of metal components. Background technique [0002] The eddy current method is widely used due to its technical characteristics such as non-destructive, non-contact, and adjustable detection depth with frequency. At present, mature testing instruments and equipment have been developed for the defect detection of metal components, but the application of component stress-strain measurement is still limited. In its infancy. When the bar is subjected to tension, compression, torsion and cyclic stress, the measurement data of its internal stress is helpful for the evaluation of the mechanical properties of the bar. At present, there are few reports on the non-destructive and non-contact measurement method of the stress of the b...

AI Technical Summary

Problems solved by technology

When the bar is subjected to tension, compression, torsion and cyclic stress, the measurement data of its internal stress is helpful for the evaluation of the mechanical properties of the bar. At present, there are few reports on the non-destructive and non-contact measurement method of the stress of the bar, especially the cyclic stress. few

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