激光超声测量金属材料弹性常数实验与有限元分析

doi:10.12068/j.issn.1005-3026.2018.09.029

东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (9): 1363-1368.DOI: 10.12068/j.issn.1005-3026.2018.09.029

• 力学 • 上一篇

激光超声测量金属材料弹性常数实验与有限元分析

战宇¹，林中亚¹，刘常升²

(1. 东北大学理学院，辽宁沈阳110819; 2. 东北大学材料科学与工程学院，辽宁沈阳110819)

收稿日期:2017-06-05 修回日期:2017-06-05 出版日期:2018-09-15 发布日期:2018-09-12
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.冯明杰(1971-)，男，河南禹州人，东北大学副教授; 王恩刚(1962-)，男，辽宁沈阳人，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(51771051); 辽宁省博士科研启动基金资助项目(20170520439)；中央高校基本科研业务费专项资金资助项目(N170504021).国家自然科学基金资助项目(51171041).

Experiment and Finite Element Simulation for Laser Ultrasonic Measurement of the Elastic Constants of Metal Materials

ZHAN Yu¹， LIN Zhong-ya¹， LIU Chang-sheng²

1. School of Sciences， Northeastern University， Shenyang 110819， China; 2. School of Materials Science & Engineering， Northeastern University， Shenyang 110819， China.

Received:2017-06-05 Revised:2017-06-05 Online:2018-09-15 Published:2018-09-12
Contact: LIU Chang-sheng
About author:-
Supported by:
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摘要/Abstract

摘要： 利用激光诱导产生的多种模态超声波的波速反演金属铝板的弹性常数.实验中将脉冲激光聚焦成线源在铝板表面诱导超声波，采用双通道非接触接收表面波的时域信息并测算其速度.在有限元分析中，将激光等效为时间和空间上均满足高斯分布的脉冲载荷，建立热力耦合分析模型对激光诱导超声波的过程进行模拟，提取超声信号的时域信息并计算表面波和纵波速度，利用声弹性方程得到铝的弹性常数.数值结果与理论值相吻合，表明建立的激光超声力学模型能够有效模拟激光诱导超声波的物理过程，为进一步利用激光超声技术研究材料力学性能提供了依据.

关键词: 激光超声, 弹性常数, 有限元模拟, 表面波, 纵波

Abstract: The elastic constants of aluminum plates were inversed by the wave velocity of various modal ultrasonic waves induced by lasers. In the experiment， the pulse laser was focused into the line source to induce the ultrasonic wave on the surface of the aluminum plate， and the dual channel non-contact method was used to receive the time domain information of the surface wave and then its velocity was measured. In the finite element analysis， the laser was equivalent to the pulse load that is satisfied with the Gaussian distribution both in time and space. A thermal coupling analysis model was built to simulate the process of laser induced ultrasonic. The time domain information of the ultrasonic signals were received to calculate the surface wave’s and longitudinal wave’s velocities. Then the elastic constants of aluminum plates were obtained by using the acoustic elastic equation. The numerical results agreed with the theoretical values， which indicates that the established laser ultrasonic model can effectively simulate the physical process of ultrasonic induced by lasers， and provide the basis for further studies on the mechanical properties of the materials by laser ultrasonic techniques.

Key words: laser ultrasonic, elastic constants, finite element simulation, surface wave, longitudinal wave

中图分类号:

O341

战宇，林中亚，刘常升. 激光超声测量金属材料弹性常数实验与有限元分析[J]. 东北大学学报:自然科学版, 2018, 39(9): 1363-1368.

ZHAN Yu， LIN Zhong-ya， LIU Chang-sheng. Experiment and Finite Element Simulation for Laser Ultrasonic Measurement of the Elastic Constants of Metal Materials[J]. Journal of Northeastern University Natural Science, 2018, 39(9): 1363-1368.

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激光超声测量金属材料弹性常数实验与有限元分析

Experiment and Finite Element Simulation for Laser Ultrasonic Measurement of the Elastic Constants of Metal Materials

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