Nondestructive Testing and Characterization of Residual Stress Field Using an Ultrasonic Method

查看全文 作　　者：SONG [1,2]Wentao;XU [1]Chunguang;PAN [1]Qinxue;SONG [1]Jianfeng

机构地区：[1]School of Mechanical Engineering, Beijing Institute of Technology;[2]School of Mechanical Engineering, Shijiazhuang Tiedao University

出　　处：《Chinese Journal of Mechanical Engineering》索引2016年第29卷第2期,共7页

基　　金：Supported by National Natural Science Foundation of China(Grant No.51275042) 摘　　要：To address the difficulty in testing and calibrating the stress gradient in the depth direction of mechanical components, a new technology of nondestructive testing and characterization of the residual stress gradient field by ultrasonic method is proposed based on acoustoelasticity theory. By carrying out theoretical analysis, the sensitivity coefficients of different types of ultrasonic are obtained by taking the low carbon steel(12%C) as a research object. By fixing the interval distance between sending and receiving transducers, the mathematical expressions of the change of stress and the variation of time are established. To design one sending-one receiving and oblique incidence ultrasonic detection probes, according to Snell law, the critically refracted longitudinal wave(LCR wave) is excited at a certain depth of the fixed distance of the tested components. Then, the relationship between the depth of LCR wave detection and the center frequency of the probe in Q235 steel is obtained through experimental study. To detect the stress gradient in the depth direction, a stress gradient LCR wave detection model is established, through which the stress gradient formula is derived by the relationship between center frequency and detecting depth. A C-shaped stress specimen of Q235 steel is designed to conduct stress loading tests, and the stress is measured with the five group probes at different center frequencies. The accuracy of ultrasonic testing is verified by X-ray stress analyzer. The stress value of each specific depth is calculated using the stress gradient formula. Accordingly, the ultrasonic characterization of residual stress field is realized. Characterization results show that the stress gradient distribution is consistent with the simulation in ANSYS. The new technology can be widely applied in the detection of the residual stress gradient field caused by mechanical processing, such as welding and shot peening. 关键词：残余应力场表征技术无损检测超声法 Snell定律接收换能器 Q235钢应力梯度

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Nondestructive Testing and Characterization of Residual Stress Field Using an Ultrasonic Method

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