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首页> 外文期刊>Journal of thermal stresses >LASER-GENERATED THERMOELASTIC WAVES IN AN ANISOTROPIC INFINITE PLATE: EXACT ANALYSIS
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LASER-GENERATED THERMOELASTIC WAVES IN AN ANISOTROPIC INFINITE PLATE: EXACT ANALYSIS

机译：各向异性无限板中激光产生的热弹性波：精确分析

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摘要

In recent years, the study of thermoelastic waves generated by lasers has been undertaken by several researchers because the technique provides an efficient non-contact technique for generation and detection of ultrasonic waves. Laser-generated ultrasonic waves have diverse applications ranging from material characterization to defect characterization. Transient ultrasonic guided waves generated by a pulsed laser in anisotropic infinite plate are investigated in this article. An exact analytical method is adopted for this purpose. The governing equations and boundary conditions are first transformed from spatial-time domain into wavenumher-frequency domain using Fourier Transform. After solving these equations and satisfying the boundary conditions in the wavenumber-frequency domain, the Cauchy's residue theorem is used to get the response in the spatial domain and then the numerical integration is used to eventually obtain the response in time domain. Results for dispersion and transient guided waves in infinite silicon nitride (Si_3N_4) plates are presented. Numerical results show that pulsed laser excites mainly the lowest Lamb modes, namely, the lowest symmetric (S_0) and antisymmetric (A_0) modes. They also show that the transient response is dominated by the antisymmetric mode A_0 which shows dispersion characteristic. This study provides a quantitative model for laser generated ultrasonic waves in an anisotropic plate and can be used for non-destructive evaluation.
机译：近年来，一些研究人员已经进行了由激光产生的热弹性波的研究，因为该技术为超声波的产生和检测提供了一种有效的非接触技术。激光产生的超声波具有从材料表征到缺陷表征的多种应用。本文研究了脉冲激光在各向异性无限板中产生的瞬态超声导波。为此采用了精确的分析方法。首先使用傅立叶变换将控制方程和边界条件从时空域转换为波数域。在求解这些方程并满足波数-频域的边界条件之后，使用柯西残差定理获得空间域的响应，然后使用数值积分最终获得时域的响应。给出了无限大氮化硅（Si_3N_4）板中色散和瞬态导波的结果。数值结果表明，脉冲激光主要激发最低的Lamb模式，即最低的对称（S_0）和反对称（A_0）模式。他们还表明，瞬态响应受显示弥散特性的反对称模式A_0支配。这项研究为各向异性板中激光产生的超声波提供了定量模型，可用于无损评估。

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