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Influence of transparent coating thickness on thermoelastic force source and laser-generated ultrasound waves

机译：透明涂层厚度对热弹力源和激光产生的超声波的影响

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摘要

A numerical model is established to investigate the influence of transparent coating thickness on the laser-generated thermoelastic force source and ultrasound waves in the coating-substrate system by using the finite element method (FEM). Taking into account the effects of thermal diffusion, the finite width and duration of the laser source, as well as the temperature dependence of material properties, the transient temperature distributions are obtained firstly. Applying this temperature field to structure analyses as thermal loading, the thermoelastic stress field and laser-generated ultrasound wave in the specimen are obtained. The generation and propagation of the laser thermoelastically induced stress field and ultrasonic waves in coating-substrate system are presented in detail. The influence of transparent coating thickness on the transient temperature distribution, thermoelastic force source and the laser-generated ultrasound waveforms is investigated. The numerical results indicate that the thermoelastic force source and laser-generated ultrasound waveform are strongly affected by the coating thickness due to the constraint of coating. This method can provide insight into the generation and propagation of the laser-generated stress field in coating-substrate system consisting of a transparent coating and an opaque metallic substrate. It provides theoretical basics to optimize ultrasonic signal generation in particular applications and invert the physical and geometrical parameter of the coating-substrate system more accurately in the experiment.
机译：建立了一个数值模型，通过有限元方法研究透明涂层厚度对激光-产生的热弹力源和超声波在涂层-基底系统中的影响。考虑到热扩散的影响，激光源的有限宽度和持续时间以及材料特性的温度依赖性，首先获得了瞬态温度分布。将该温度场作为热载荷应用于结构分析，获得了试样中的热弹性应力场和激光产生的超声波。详细介绍了激光热弹性感应应力场和超声波在涂层—基底体系中的产生和传播。研究了透明涂层厚度对瞬态温度分布，热弹性力源和激光产生的超声波形的影响。数值结果表明，由于涂层的限制，热弹性力源和激光产生的超声波形受到涂层厚度的强烈影响。此方法可以提供对由透明涂层和不透明金属基材组成的涂层-基材系统中激光产生的应力场的产生和传播的了解。它提供了理论基础，可以优化特定应用中的超声信号生成，并在实验中更准确地反转涂层-基材系统的物理和几何参数。

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  • 来源
    《Applied Surface Science》 |2009年第16期|7172-7178|共7页
  • 作者

    Jijun Wang; Baiqiang Xu; Zhonghua Shen; Xiaowu Ni; Jian Lu;

  • 作者单位

    Faculty of Science, Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China Faculty of Science, Jiangsu University, Zhenjiang, 212013, People's Republic of China;

    Faculty of Science, Jiangsu University, Zhenjiang, 212013, People's Republic of China;

    Faculty of Science, Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China;

    Faculty of Science, Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China;

    Faculty of Science, Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    laser-generated ultrasound; thermoelastic force source; coating-substrate system; finite element method;

    机译：激光产生的超声波热弹性力源涂料-基材体系;有限元法;

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