激光激发黏弹表面波有限元数值模拟

研究黏弹性材料中激光激发的Rayleigh波的传播特征. 考虑到黏弹性材料的黏性特征,在频域内建立黏弹性材料中激光激发Rayleigh波的有限元数值模型. 在验证有限元频域数值模型正确性的基础上，模拟脉冲激光作用在黏弹性材料上激发出Rayleigh波，进而讨论激光激发的黏弹Rayleigh波的传播特征，并比较黏弹性材料与弹性材料中激光激发的Rayleigh波差异，同时分析了材料的黏性劲度参量变化对Rayleigh波特征的影响. 关键词： 表面波 激光超声 有限元方法 黏弹性

Numerical simulation of laser-generated Rayleigh wave by finite element method on viscoelastic materials

The propagation of laser-generated Rayleigh wave in the viscoelastic material are studied theoretically. Taking account of the viscosity characteristic of the viscoelastic material, a numerical model for simulating laser-generated Rayleigh wave in the viscoelastic material is developed in the frequency domain. Based on the correctness of the finite element numerical model in the frequency domain, the laser generation of Rayleigh wave in the viscoelastic material is simulated. And then, the propagation characteristics of laser-generated Rayleigh wave are discussed and the difference of Rayleigh waves in the viscoelastic material and the elastic material are compared. The effect of different viscosity modulus to the characteristic of Rayleigh wave is analyzed in detail.