microcrack;colinear wave-mixing;nonlinear ultrasonic;finite element simulation
期刊：
MATERIALS EVALUATION
ISSN：
0025-5327
年：
2019
卷：
77
期：
9
页码：
1099-1107
机构署名：
本校为第一且通讯机构
院系归属：
汽车与机械工程学院
摘要：
The timely detection of microcracks is of great significance for ensuring the safety of key components. In this paper, colinear wave-mixing technology using the ultrasonic surface wave was applied for the detection of microcracks on metal surfaces. The propagation model of colinear wave-mixing surface wave was first established by the finite element method, and the effect of propagation distance was studied to determine an appropriate observation point to receive signals. The effect of the size of the microcracks on the nonlinear coefficient was then studied. The simulated results show that th...
