Method and system for measuring stress of metal components based on eddy current impedance
A technology for measuring metal components and stress, which is applied in the measurement of properties and forces of piezoelectric resistance materials, calibration/testing of force/torque/work instruments, and measuring devices to achieve the effect of improving stability and reliability.
Active Publication Date: 2017-12-22
BEIJING UNIV OF TECH
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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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[0039] see image 3 As shown, the following two loading methods can be used in the calibration test experiment of this system: 1) Apply tensile, compressive or torsional stress to the metal member to simulate static load; 2) Apply axial cyclic stress to the metal member to simulate dynamic load . Taking the measurement of a metal rod as an example, after the loading mode is selected, the specific implementation of the present invention will be described in detail below with reference to the accompanying drawings and examples.
[0040] Metal component stress measurement method and system based on eddy current impedance, see image 3 As shown, the system includes an eddy current sensor clamped on a metal rod (5mm stainless steel rod), a measurement circuit, a signal generating and collecting device, and a host computer. When the stress of the metal rod changes, the system can quickly calculate and display the stress value of the metal rod by measuring the change of electrical ...
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The method and system for measuring the stress of metal components based on eddy current impedance. The system consists of eddy current sensors, measurement circuits, signal generation and acquisition devices, and host computers. In this system, special eddy current sensors are fixed on metal components, and the measurement circuit and signal generation and control The acquisition device measures and collects the electrical impedance of the eddy current sensor, and the upper computer performs calibration equation analysis and stress conversion; the measurement circuit, signal generation and acquisition device and the upper computer perform characteristic voltage signal measurement, electrical impedance calculation and stress conversion, wherein The equivalent circuit of the eddy current sensor and the voltage dividing resistor are connected in series to form an RL circuit. The measuring circuit, the signal generation and acquisition device realize the rapid measurement of the voltage UR at both ends of the voltage dividing resistor, combined with the excitation signal Ui input to the RL circuit by the signal generation and acquisition device, Through the signal spectrum and impedance calculation module of the host computer, the electrical impedance Z=R(Ui / UR‑1) of the eddy current sensor is obtained.
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...
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IPC IPC(8): G01L1/18G01L25/00
Inventor 吴斌王鹤云刘秀成孟繁霖何存富
Owner BEIJING UNIV OF TECH