利用激光超声技术研究金属裂纹缺陷的检测波特性

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (14) : 33-37.

论文

丁一珊，杨世锡，甘春标

作者信息 +

Detecting features of defect metal based on laser ultrasonic

DING Yi-shan，YANG Shi-xi，GAN Chun-biao

Author information +

文章历史 +

摘要

利用激光在热弹机制下激发声表面波的理论模型，数值模拟激光与材料相互作用过程。分别获得无裂纹、表面裂纹、其它裂纹下材料变形、温度变化、声波信号，并获得缺陷具有明显滤波效应、调制信号作用及其它裂纹检测受声表面波衰减特性影响的结论。针对表面裂纹深度、宽度对检测效果影响模拟仿真。结果显示，深度、宽度增加均会引发上升沿信号成分丢失；而宽度增加过程中透射波信号衰减较明显。

Abstract

In the thermo-elastic mechanism, the process of interaction between laser and material is numerically simulated based on the theatrical model of the surface acoustic wave. The material deformation temperature changes and acoustic signals, with surface and sub-surface together with no defects are derived from it, as well as the filtering and modulating effects of the defects, moreover, the conclusion that attenuation characteristic of surface acoustic waves with sub-surface defects. Simulation is acted to explore the relation between the width and length with the detection effect. It is showed that the increase of both the width and the depth would lead to the loss of the rising edge signal components, at the same time, the transmission wave signal’s attenuation is more obvious.

导出引用

丁一珊，杨世锡，甘春标. 利用激光超声技术研究金属裂纹缺陷的检测波特性[J]. 振动与冲击, 2015, 34(14): 33-37

DING Yi-shan，YANG Shi-xi，GAN Chun-biao. Detecting features of defect metal based on laser ultrasonic[J]. Journal of Vibration and Shock, 2015, 34(14): 33-37

参考文献

[1]White R M. Elastic wave generation by electron bombardment of electromagnetic wave absorption[J].Journal of Applied Physics ,1963,34(7): 2123-2124.
[2]Scruby C B. Some application of laser ultrasound[J]. Ultrasonics,1989,27(4):195-209.
[3] 张中洲.无损检测概论[M].北京：机械工业出版社,1993.
[4]White R M. Generation of elastic wave of transient surface heating[J].Journal of Applied Physics,1963,34(2):3559- 3567.
[5] Reddy J N. An introduction to the finite element method(2nd ed.) [M]. New York: McGraw-Hill,1993.
[6] Cook R D, Malkus D S, Plesha M E. Concepts and applications of finite element analysis(3rd ed.) [M]. New York: Wiley,1989.
[7] Arias I, Murry T W, Achenbach J D.Near field analysis of laser-generated ultrasound: the effects of thermal diffusion and optical penetration[J]. AIP Conference Proceedings, 615:324-331.
[8]王泽鹏,张秀辉,胡仁喜. 热力学有限元分析从入门到精通[M]. 北京：机械工业出版社,2010:25-30.
[9] Xu B, Shen Z,Ni X.Finite element model of laser-generated surface acoustic waves in coating-substrate system[J]. Journal of Applied physics,2004,95(4): 2109-2115.
[10] Edwards R S, Dutton B. Interaction of laser generated ultrasonic waves with wedge-shaped samples[J]. Applied Physics Letters, 2012, 100(18):184102.
[11] 王敬时,徐晓东,刘晓峻,等. 利用激光超声技术研究表面微裂纹缺陷材料的低通滤波效应[J]. 物理学报,2008, 57(12): 7765-7769.
WANG Jing-shi,XU Xiao-dong,LIU Xiao-jun, et al. Low pass effect of surface defect metal based on laser ultrasonic [J]. Acta Phys. Sin.,2008, 57(12): 7765-7769.
[12] Lee J R, Chia C C. Laser ultrasonic propagation imaging method in the frequency domain based on wavelet transformation[J]. Optics and Lasers in Engineering , 2011, 49(1): 167-175.
[13]沈中华,石一飞,严刚,等.激光声表面波的若干应用研究进展[J].红外与激光工程,2007,36(S1):241-244.
SHEN Zhong-hua,SHI Yi-fei,YAN Gang, et al. Progresses in the application of laser induced surface acoustic waves[J]. Infrared and Laser Engineering,2007,36(S1):241-244.