Electromagnetic Ultrasonic Residual Stress and Strain Detection Method Based on Rayleigh Wave Polarization
An electromagnetic ultrasonic and residual stress technology, applied in the direction of using ultrasonic/sonic/infrasonic waves, force/torque/power measuring instruments, measuring devices, etc., can solve the problems of low sensitivity and poor spatial resolution, and achieve high sensitivity and spatial resolution rate effect
Active Publication Date: 2018-07-06
XI AN JIAOTONG UNIV
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[0005] In order to solve the main shortcomings of the current ultrasonic residual stress / strain detection method, such as low sensitivity and poor spatial resolution, the purpose of the present invention is to propose an electromagnetic ultrasonic residual stress and strain detection method based on Rayleigh wave polarization
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[0026] Such as figure 1 As shown, the electromagnetic ultrasonic stress / strain detection system based on Rayleigh wave polarization is composed of a conductor specimen 1 to be tested, a surface wave electromagnetic ultrasonic probe 2 capable of exciting Rayleigh waves 3, and a surface wave electromagnetic ultrasonic probe 2 for receiving the particle at the point to be measured. The in-plane electromagnetic ultrasonic probe 5 and the out-plane electromagnetic ultrasonic probe 6 are composed of vibration signals in two directions.
[0027] The detection principle of the method of the present invention is: the surface wave electromagnetic ultrasonic probe 2 can excite the Rayleigh wave 3 on the surface of the conductor test piece 1, and the Rayleigh wave 3 propagating on the surface of the test piece will cause the particles on the surface of the test piece to undergo elliptical motion 4. Such as figure 2 As shown, this movement can be decomposed into vibrations in two direct...
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Electromagnetic ultrasonic residual stress and strain detection method based on Rayleigh wave polarization. In this method, a pulsed current source and an electromagnetic ultrasonic surface wave probe are used to excite Rayleigh waves on the surface of conductor specimens with known stresses and strains of different sizes; Then at a certain point in the direction of Rayleigh wave propagation, use specially designed in-plane electromagnetic ultrasonic probe and out-of-plane electromagnetic ultrasonic probe to detect the time-domain component signals of Rayleigh wave in the plane and in the vertical and plane directions; and then according to These two signals obtain the elliptical trajectory of the particle vibration in the small area around the measured point, calculate the polarization of the Rayleigh wave at the measured point, and obtain the relative change in the Rayleigh wave polarization and the residual stress / strain Linear relationship; based on this linear relationship, the residual stress / strain in the test piece can be determined by measuring the polarization of the Rayleigh wave propagating on the surface of the test piece in an unknown stress / strain state by the above method.
Description
technical field [0001] The invention relates to an ultrasonic nondestructive testing method for residual stress / strain, in particular to an electromagnetic ultrasonic residual stress and strain testing method based on Rayleigh wave polarization. Background technique [0002] Some important structures in the mechanical system are prone to microscopic damage such as residual stress and strain (even plastic deformation) on the surface and interior of the structure when they are subjected to excessive loads during processing, assembly and operation. The existence of these microscopic damages will not only greatly reduce the mechanical properties of the structure, but also easily cause macroscopic damages such as stress corrosion cracks and fatigue cracks in the structure, which poses a great hidden danger to the safety of the mechanical structure. [0003] Currently applied residual stress / strain measurement methods can be divided into two categories: destructive and nondestruct...
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IPC IPC(8): G01B17/04
CPCG01B17/04G01L5/0047
Inventor 裴翠祥赵思琦陈振茂肖盼
Owner XI AN JIAOTONG UNIV