摘要
为了研究柱面上激光激发的瑞利(Rayleigh)波的色散特性,建立了激光在各向同性圆柱表面激发瑞利波的有限元模型。该模型以热弹激发机制为基础,同时考虑了材料热物理参数的温度依赖性。在验证了模型正确性的基础上,计算了激光在不同直径铝圆柱表面激发的瑞利波波形,结合相谱分析法得到了柱面瑞利波的色散曲线。同时分析了圆柱直径对柱面瑞利波色散特性的影响。结果表明:随着频率的增加,柱面瑞利波的相速度先迅速增加到最大值CRmax后逐渐减小并趋于平面瑞利波的波速CPR。此外,随圆柱直径的增加,柱面瑞利波的色散减弱;直到圆柱直径趋于无限大(即平面)时,色散现象消失。
To investigate the dispersive character of cylindrical Rayleigh wave, a finite element model is developed to simulate laser inducing cylindrical Rayleigh waves on the surface of an isotropic cylinder. This model is based on the thermoelastic mechanism and can take the temperature dependence of material properties into account. Verifying the correctness of the model, the waveforms of cylindrical Rayleigh waves induced by laser on the cylinders with different radii was calculated, and quantitatively analyzed the influence of the cylinder＇s diameter on the dispersion character of cylindrical Rayleigh waves by the phase spectral analysis method. The results show that with the frequency increasing, the phase velocity of cylindrical Rayleigh wave rapidly increases to the maximum value CRmax, and then gradually decreases to that of plane Rayleigh wave CR^P. Moreover, as the radius of cylinder increases, the dispersion of cylindrical Rayleigh decreases, until the radius increases to ∞ （plane）, the dispersion will vanish.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2006年第8期1062-1065,共4页
Chinese Journal of Lasers
基金
南京理工大学青年学者基金(Njust200503)
关键词
激光技术
超声学
柱面瑞利波
有限元方法
laser technology
ultrasonic
cylindrical Rayleigh wave
finite element method
