Acoustic Nonlinearity of a Laser-Generated Surface Wave in a Plastically Deformed Aluminum Alloy  

作　　者：KIM Chung-Seok JHANG Kyung-Young 

机构地区：[1]Metallurgy and Materials Engineering,Chosun University,Seosuk-dong,Gwangju,501-759,South Korea [2]Mechanical Engineering,Hanyang University,Hangdang-dong,Seongdong-gu,Seoul,133-791,South Korea

出　　处：《Chinese Physics Letters》2012年第12期39-43,共5页中国物理快报（英文版）

摘　　要：The acoustic nonlinearity of surface waves is studied to evaluate plastic deformation in aluminum alloys.A narrow-band surface wave is successfully generated by a pulsed Nd-YAG laser system consisting of a beam expander and a slit mask.Various degrees of tensile deformation are induced by interrupting the tensile tests so as to obtain aluminum specimens with different degrees of plastic damage.The normalized acoustic nonlinearity increases as a function of tensile strain.The experimental results show that the acoustic nonlinearity of a laser-generated surface wave has a good correlation with the level of tensile deformation and has a potential to evaluate microdamage induced by dislocation microplasticity.

关 键 词：DEFORMATION NONLINEARITY DEFORM 

分 类 号：TG1[金属学及工艺—金属学]