Laser-induced ultrasonic waves in steels with gradient changes of elastic property

Laser-induced ultrasonic waves in steels with gradient changes of elastic property
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激光诱导超声波在钢中的弹性梯度变化

DOI:
10.1016/j.optlastec.2007.06.002
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发表时间:
2008-03
影响因子:
5
通讯作者:
Shen, Zhonghua
Shen, Zhonghua
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Shi, Yifei;Ni, Xiaowu;Yuan, Ling;Shen, Zhonghua

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考虑到近表面弹性性质的梯度变化,建立了半无限大基底上的多梯度层模型。建立了一个有限元模型,模拟了激光热弹作用下系统中声波的产生和传播过程。采用二维快速傅里叶变换(2-D FFT)方法对超声信号进行了分析。获得的相速度色散的数量获得的不同模式的波,并在系统中进行了分析,具有不同的空间变化的材料的弹性特性和不同的影响层深度。该模型可以有效地提取近地表区域的弹性参数。
Taking account of the gradient changes of the near-surface elastic property, a model of multiple gradient layers on a semi-infinite substrate is established. A finite element method (FEM) model is developed to simulate the laser-induced thermo-elastic generation and propagation of acoustic waves in the system. The two-dimensional fast Fourier transform (2-D FFT) method has been used to analyze the ultrasonic signal. The phase velocity dispersion is obtained for a number of waves of different modes obtained and is analyzed in systems with different spatial variations of the material elastic properties and different affected layer depths. The model can be used to extract the elastic parameters of the near-surface regions in an effective way.
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