Characterizing the properties of ultrasonics propagating on the surface of materials with defect by Laser-ultrasonics method  

作　　者：XU Xiaodong CHEN Xiang LI Kaiyuan LIU Xiaojun CHENG Jianchun Christ Glorieux 

机构地区：[1]Key Lab. of Modern Acoustics of Ministry of Education, Nanjing University Nanjing 210093 [2]Laboratorium voor Akoestiek en Thermische Fysica, Departement Natuurkunde, K. U. Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium [3]Institute of Acousics, Chinese Academy of Sciences Beijing 100190

出　　处：《Chinese Journal of Acoustics》2011年第4期391-397,共7页声学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(11074126,10674069);NSFC-KOSEF

摘　　要：A laser ultrasonics method is used to surface wave traveling on the surface of materials characterize the propagation properties of with sub-surface defect in 2D. Linear and nonlinear propagation properties of ultrasonics caused by the defects have been detected in experiment. A theoretical model is proposed and used to study the linear and nonlinear properties of ultrasonics caused by the defect. The numerical results indicate that the nonlinear ultrasonic wave will be excited when a finite amplitude ultrasonics propagates on the surface of materials with sub-surface defect. The theoretical analysis confirms that the nonlinear wave is caused by the ＂clapping＂ of the interface of defect instead of the mode conversions of ultrasonics.A laser ultrasonics method is used to surface wave traveling on the surface of materials characterize the propagation properties of with sub-surface defect in 2D. Linear and nonlinear propagation properties of ultrasonics caused by the defects have been detected in experiment. A theoretical model is proposed and used to study the linear and nonlinear properties of ultrasonics caused by the defect. The numerical results indicate that the nonlinear ultrasonic wave will be excited when a finite amplitude ultrasonics propagates on the surface of materials with sub-surface defect. The theoretical analysis confirms that the nonlinear wave is caused by the ＂clapping＂ of the interface of defect instead of the mode conversions of ultrasonics.

分 类 号：TB559[理学—物理] TU528.572[理学—声学]