南京邮电大学学报（自然科学版）2011，Vol.31Issue(3)：108-113,6.
脉冲激光线源热弹激发超声导波的数值研究
Numerical Simulation of Ultrasonic Guide Waves Generated by Pulsed Laser Line Source in Thermoelastic Regime
摘要
Abstract
Two dimensional plane strain finite element model have been presented to simulate the laser generated surface acoustic waves on the top surface of aluminum plate, which considered the temperature dependent physical parameters of sample. Numerical results have demonstrated that laser generated sur-face acoustic wave forms are calculated in Al plate of 1 cm thickness, which usually involve skimming lon-gitudinal mode, skimming shear mode and Rayleigh mode; meantime, the guide wave excited by a pulsed line source on a 0.2-mm-thickness Al plate is typical Lamb waves and the surface vibration is mainly de-termined by the lowest order of the symmetric mode ( s0 ) and antisymmetric mode ( a0) . It is also indica-ted that the amplitude of the guide waves are strongly dependent with the half width of the line-shaped la-ser source,which can be an important basis for the research on nondestructive evaluation fields.关键词
激光线源；热弹机制；有限元法；导波Key words
laser line source/ thermoelastic/ finite element method/ guide wave/分类
矿业与冶金引用本文复制引用
关建飞..脉冲激光线源热弹激发超声导波的数值研究[J].南京邮电大学学报（自然科学版）,2011,31(3):108-113,6.基金项目
江苏省高校自然科学基金(09KJB140005)、南京邮电大学引进人才科研启动基金(NY207005)资助项目 （09KJB140005）
