Time-Domain Second-Harmonic Generation of Primary Lamb-Wave Propagation in an Elastic Plate  

作　　者：DENG Ming-Xi XIANG Yan-Xun LIU Liang-Bing 邓明晰;项延训;刘良兵(Department of Physics,Logistics Engineering University,Chongqing 401331;School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237)

机构地区：[1]Department of Physics,Logistics Engineering University,Chongqing 401331 [2]School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237

出　　处：《Chinese Physics Letters》2011年第7期194-197,共4页中国物理快报（英文版）

基　　金：the National Natural Science Foundation of China under Grant Nos 10974256 and 11004056.

摘　　要：We present an experimental observation of the generation of the time-domain second harmonic by propagation of the primary Lamb-wave tone-burst.For a case where the phase velocity matching between the primary and the double frequency Lamb waves is satisfied but the group velocity matching between them is not,our observation clearly shows that the duration of the time-domain second-harmonic tone-burst,as well as its integrated amplitude,increases with the increasing propagation distance.This experimental result is consistent with the theoretical prediction and demonstrates that group velocity matching is not absolutely necessary for the generation of the cumulative time-domain second harmonic by primary Lamb-wave propagation.

关 键 词：MATCHING HARMONIC ELASTIC 

分 类 号：R73[医药卫生—肿瘤]