Zhan Yu, Liu Changsheng, Zhang Fengpeng, Qiu Zhaoguo
College of Sciences, Northeastern University, Shenyang 110819, China.
Key Laboratory for Anisotropy and Texture of Materials Ministry of Education, Northeastern University, Shenyang 110819, China.
Ultrasonics. 2016 Jul;69:243-7. doi: 10.1016/j.ultras.2016.03.014. Epub 2016 Apr 5.
The laser ultrasonic generation of Rayleigh surface wave and longitudinal wave in an elastic plate is studied by experiment and finite element method. In order to eliminate the measurement error and the time delay of the experimental system, the linear fitting method of experimental data is applied. The finite element analysis software ABAQUS is used to simulate the propagation of Rayleigh surface wave and longitudinal wave caused by laser excitation on a sheet metal sample surface. The equivalent load method is proposed and applied. The pulsed laser is equivalent to the surface load in time and space domain to meet the Gaussian profile. The relationship between the physical parameters of the laser and the load is established by the correction factor. The numerical solution is in good agreement with the experimental result. The simple and effective numerical and experimental methods for laser ultrasonic measurement of the elastic constants are demonstrated.
通过实验和有限元方法研究了弹性板中瑞利表面波和纵波的激光超声产生。为了消除实验系统的测量误差和时间延迟，采用了实验数据的线性拟合方法。利用有限元分析软件ABAQUS模拟了激光激发在金属薄板样品表面引起的瑞利表面波和纵波的传播。提出并应用了等效载荷法。脉冲激光在时间和空间域上等效于表面载荷，以满足高斯分布。通过修正因子建立了激光物理参数与载荷之间的关系。数值解与实验结果吻合良好。展示了用于激光超声测量弹性常数的简单有效的数值和实验方法。
