Electromagnetic ultrasonic detection method for plane residual stress
An electromagnetic ultrasonic and residual stress technology, which is applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, instruments, and materials to achieve the effects of reducing spacing, improving spatial resolution, facilitating installation and multiple reuse.
Active Publication Date: 2019-12-31
DALIAN UNIV OF TECH
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Problems solved by technology
[0005] The technical problem mainly solved by the present invention is to overcome the difficult problem of reliable measurement of the plane stress state in the electromagnetic ultrasonic measurement of the surface residual stress of the material at present, and to invent an electromagnetic ultrasonic detection method of the plane residual stress
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[0038] The implementation process of the present invention will be described in detail below in conjunction with the accompanying drawings and technical solutions, and the electromagnetic ultrasonic testing method for plane residual stress will be described.
[0039] Measurement parameters: tensile test piece, material is 7075 aluminum, thickness 8mm; tested piece, welded 7075 aluminum alloy plate, size is 150mm×240mm, thickness is 8mm; ultrasonic transmitting coil 6-1 and ultrasonic receiving coil 6-3 are It is serpentine, the distance between adjacent wires is D=0.8mm, the ultrasonic frequency of the excited surface wave is 1.75MHz, and the distance between the ultrasonic transmitting coil 6-1 and the ultrasonic receiving coil 6-3 is L=19.2mm.
[0040] The concrete steps of the inventive method are as follows:
[0041] The first step is to assemble the electromagnetic ultrasonic testing system
[0042] The electromagnetic ultrasonic detection system consists of ultrasonic c...
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The invention relates to an electromagnetic ultrasonic detection method for plane residual stress, belongs to the technical field of ultrasonic detection, and relates to an electromagnetic ultrasonicdetection system and detection method for plane residual stress. The method comprises the steps of: firstly, assembling the electromagnetic ultrasonic detection system, and measuring stress detectionultrasonic signal waveforms in three directions by using ultrasonic coils in an electromagnetic ultrasonic surface wave probe so as to calibrate an acoustic elastic coefficient of a material. The surface wave signals in three directions of a point to be measured are collected, and the magnitude and direction of plane stress are calculated by using an ultrasonic detection theoretical formula. In the method, one-time positioning of the two principal stresses in the plane stress state and the included angle between the two principal stresses, and simultaneous measurement of multiple parameters are realized by using the surface wave probe with the function of three-transmitting and three-receiving. The distance between receiving and transmitting probes is reduced and the spatial resolution ofthe probe are improved by reducing the turns per coil, the line width and the line distance of ultrasonic transmitting and receiving coils. A circuit board and an impedance matching network are connected by using a radio frequency connector, thereby facilitating the installation and repeated use for multiple times, the detection method is simple, and the efficiency is high.
Description
technical field [0001] The invention belongs to the technical field of ultrasonic testing, in particular to an electromagnetic ultrasonic testing method for plane residual stress. Background technique [0002] Residual stress is an important basis for judging the quality of engineering structures. The generation and release of residual stress usually lead to poor dimensional stability of structural parts, and even lead to catastrophe of major operating equipment, and the structural deformation caused by this stress cannot be ignored in the process of component assembly and use. Considering the demand for residual stress detection in the engineering manufacturing site environment, the residual stress ultrasonic detection method has attracted extensive attention because of its advantages such as material penetration, non-destructive, fast, high measurement efficiency, simple and portable device, and strong environmental adaptability. [0003] At present, most devices that use...
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IPC IPC(8): G01N29/04
CPCG01N29/04G01N2291/023
Inventor 王永青刘彦坤刘海波刘阔李亚鹏刘天然贾振元
Owner DALIAN UNIV OF TECH
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