中文摘要：

材料的力学性能直接影响到构件的安全性和寿命,而材料的弹性常数是其力学性能的重要指标。利用有限元软件Abaqus模拟了激光激发的超声表面波和纵波在金属薄板试样表面及体内的传播过程。采用修正的高斯分布的力源等效激光对样品的脉冲作用来产生超声波,在边界处设置无限单元消除反射回波的干扰信号,并由接收点的超声表面波和纵波信号计算得到波速大小,再根据波速和弹性常数之间的关系得到材料的弹性常数。数值结果与理论解吻合良好,为激光超声检测材料弹性常数提供了一种十分有效的数值方法。

英文摘要：

The mechanical properties of the material directly affects the safety and life of the components, and the elastic constants of materials is an important index of its mechanical properties. The finite element software Abaqus is used to simulate the propagation of Rayleigh surface wave and longitudinal wave laser excitation in the dissemination process of sheet metal sample surface and in vivo. Effect of pulse laser on the sample used is equivalent to the modified Gauss distribution power source to generate the ultrasonic. The infinite element at the boundary is set to eliminate the interference signal echo, and receive the ultrasonic signals to calculate the velocity of Rayleigh surface wave and longitudinal wave. According to the relationship between velocity and elastic constants, elastic constants is detected. The numerical results are in good agreement with theoretical solution, thus a very effective numerical method for laser ultrasonic detection of elastic constants of materials to provide.