东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (3): 406-409.DOI: 10.12068/j.issn.1005-3026.2015.03.023

• 机械工程 • 上一篇    下一篇

激光超声表面波检测薄板残余应力的数值模拟

战宇1， 刘常升2， 张凤鹏1， 邱兆国1   

  1. (1. 东北大学 理学院， 辽宁 沈阳110819； 2. 东北大学 材料与冶金学院， 辽宁 沈阳110819)
  • 收稿日期:2014-01-13 修回日期:2014-01-13 出版日期:2015-03-15 发布日期:2014-11-07
  • 通讯作者: 战宇
  • 作者简介:战宇(1980-)，男，辽宁营口人，东北大学讲师，博士; 刘常升(1963-)，男，内蒙古奈曼旗人，东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51074050); 外国青年学者研究基金资助项目(51250110080); 中央高校基本科研业务费重大科技创新项目(N130810002).

Numerical Simulation of Laser Ultrasonic Surface Wave Measurement of Residual Stress

ZHAN Yu1， LIU Chang-sheng2， ZHANG Feng-peng1， QIU Zhao-guo1   

  1. 1.School of Sciences， Northeastern University， Shenyang 110819， China; 2.School of Materials & Metallurgy， Northeastern University， Shenyang 110819， China.
  • Received:2014-01-13 Revised:2014-01-13 Online:2015-03-15 Published:2014-11-07
  • Contact: LIU Chang-sheng
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摘要： 应用ABAQUS有限元软件模拟了脉冲激光激发的超声表面波在半无限大弹性薄板内的传播. 首先把激光激励等效为作用在薄板表面的高斯分布的脉冲载荷，模拟输入的超声信号，在边界处采用无限单元来消除边界反射波对接收信号的干扰，接收到的表面波信号具有典型的表面波特点.其次，通过修正弹性模量的方法得到薄板在单向应力状态下的应力场，采用时差法得到表面波在应力区的传播速度，所得的数值结果和理论解与实验结果拟合良好，为激光超声检测残余应力提供了一种有效的数值方法.

关键词: 激光超声, 表面波波速, 有限元, 等效弹性模量, 残余应力

Abstract: The propagation of surface wave which induced by the laser ultrasonic shock processing was simulated in half-space elastic materials by ABAQUS software. First， the effect of laser shock processing was equivalent to a modulated Gaussian pulse. To eliminate the undesirable reflections from boundary edges， the infinite elements were placed along the appropriate edges of the model. The received waves agree with the Rayleigh surface waves. Secondly， the effective elastic modulus method was introduced to simulate the initial residual stress in the surface region. Detection of surface velocity based on ultrasonic time-difference method was introduced. The numerical value and theory well fit experimental datas， which provid a way of using laser ultrasonic to measure of the residual stress.

Key words: laser ultrasonic, surface wave velocity, finite element, equivalent modulus, residual stress

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