Interaction of fatigue crack with vibration and ultrasound in metallic rod and its use for quantitative characterization  

作　　者：LIU Bin GANG Tie WAN Chuhao LUO Zhiwei LUAN Yilin 

机构地区：[1]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology [2]School of Materials Science and Engineering,Heilongjiang University of Science and Technology

出　　处：《Chinese Journal of Acoustics》2016年第2期155-166,共12页声学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(51575134,51175113,51105033,51205083)

摘　　要：According to the principle of synchronous demodulation, the modulation informa- tion in the output signal of vibro-acoustic modulation test was investigated and the nonlinear interaction of sound and vibration with the crack interface in a metallic rod was analyzed. A swept signal excitation was used to obtain a proper high frequency parameter in the test of alu- minum rod samples with different sizes of cracks and the modulation information in the output signal was analyzed. It was found that the ultrasound wave in the structure can be separated into two parts. One is the wave which passes through the crack interface modulated by the low frequency vibration, and other wave has no any changes. The nonlinear modulation model was modified and a quantitative method for crack detection was proposed. It is demonstrated by comparing with the ultrasonic C-scanning that this method can be used to estimate the fatigue crack size in the metallic rod.According to the principle of synchronous demodulation, the modulation informa- tion in the output signal of vibro-acoustic modulation test was investigated and the nonlinear interaction of sound and vibration with the crack interface in a metallic rod was analyzed. A swept signal excitation was used to obtain a proper high frequency parameter in the test of alu- minum rod samples with different sizes of cracks and the modulation information in the output signal was analyzed. It was found that the ultrasound wave in the structure can be separated into two parts. One is the wave which passes through the crack interface modulated by the low frequency vibration, and other wave has no any changes. The nonlinear modulation model was modified and a quantitative method for crack detection was proposed. It is demonstrated by comparing with the ultrasonic C-scanning that this method can be used to estimate the fatigue crack size in the metallic rod.

分 类 号：TG115.285[金属学及工艺—物理冶金]