Sum frequency nonlinear effects of micro-crack orientation and ultrasound in metallic materials
YANG Bin1, SHI Kaiyuan1, YUAN Tingbi2, XIAO Deming2, WANG Kan1, LI Zhenhai1
1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China;
2. Guodian Boiler Pressure Vessel Inspection Co., Ltd., Beijing 102209, China
Abstract：In order to study the non-destructive testing of micro-crack orientation angle of metal materials, the research of the ultrasonic sum frequency nonlinear effect about the micro-crack orientation of metallic materials is carried out. In theory, the relationship between the ultrasonic nonlinear frequency characteristic coefficient and the orientation angle of micro-crack is established. Then, the results of finite element simulation and calculation show that with the gradual increase of the orientation angle of the micro-cracks, there is a clear positive correlation trend between the ultrasonic nonlinear frequency characteristic coefficient and the micro-crack orientation angle, and compared to the secondary nonlinear coefficient, the sum frequency nonlinear coefficient is more sensitive to micro-crack orientation detection. At the same time, from the perspective of the average ultrasonic wave energy density, for example, the sound intensity, the sound intensity of the sum frequency component will increase with the increase of the orientation angle of the micro-crack, and the sound intensity of the second harmonic component will not change substantially. The ratio of the sound intensity of the sum frequency component is also significantly higher than that of the second harmonic component. The calculation results of the ultrasonic intensity are basically consistent with the simulation results, which proves the correctness of the theoretical model. Finally, through the design experiments, the use of simulated cracks to verify the validity of the model provides an effective means for the detection of micro-crack orientation of metallic materials.
杨斌, 史开元, 袁廷璧, 肖德铭, 王侃, 李振海. 金属材料微裂纹取向与超声波和频非线性效应[J]. 北京航空航天大学学报, 2019, 45(4): 695-704.
YANG Bin, SHI Kaiyuan, YUAN Tingbi, XIAO Deming, WANG Kan, LI Zhenhai. Sum frequency nonlinear effects of micro-crack orientation and ultrasound in metallic materials. JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2019, 45(4): 695-704.
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2019, Vol. 45 
