摘要
用有限元方法,对薄管中热弹机制产生的激光超声进行了研究。在考虑材料热物理参数随温度变化的前提下,得到了薄铝管中的温度场和表面的超声导波,描绘了薄铝管中的逆时针向不同接收点处表面导波的时域波形图。由波形图可知,薄圆管中的激光超声导波是典型的L(0,m)模态的超声Lamb波,同时数值结果验证了管道中L(0,2)模式是传播速度最快且频散较小的导波,为激光超声导波在管道无损检测中的应用打下了一定的基础。
Using the finite element method, the thermo-elastic generation of laser-ultrasound in cylindrical shell is studied. After considering the temperature dependence of the thermo-physical parameters of the material, the transient temperature fields and the surface guided waves were obtained. A series of the time domain waveforms at different source-receiver angles were shown in an anti-clockwise direction. The numerical results denote that the excited elastic waves by a pulsed laser in a cylindrical shell are typical L（0, m） mode of Lamb waves. And the numerical results prove that L（0, 2） mode is the fastest transmitting and less dispersive guided waves.
出处
《光电工程》
EI
CAS
CSCD
北大核心
2005年第12期13-16,共4页
Opto-Electronic Engineering
基金
国家自然科学基金项目(60208004)
关键词
激光超声
温度场
LAMB波
有限元方法
薄管
Laser ultrasonic
Temperature field
Lamb wave
Finite element method
Cylindrical shell
