基于热弹机理 ,结合激光超声的特点阐述了用有限元法研究激光超声的注意点 ,给出了有限元单元长度和时间步长的选取原则 ,并把有限元方法成功应用于管状材料中激光超声的研究 ,在考虑材料热物理参数随温度变化的前提下首先得到了薄铝管中的温度场 ,再用得到的最高温度场作为加载得到了薄铝管中的超声Lamb波。可见 ,有限元方法用于研究激光超声是非常有效的。

Based on the thermoelastic theory, combined with the properties of laser-induced ultrasound, the key points of studying laser-induced ultrasound by finite element method are presented. The principle of selecting the element size and the time step of finite element method are given. And the finite element method has been applied in the study of laser-induced ultrasound in cylindrical shells successfully. Using the finite element method, firstly the transient temperature fields are obtained in the case of considering the temperature dependence of the thermo-physical parameters of the material, furthermore, the laser-induced Lamb waves in aluminum cylindrical shell are obtained. The numerical results proved that the procedure is effective and versatile.