针对6061铝合金材料表面缺陷的激光超声检测（英文）
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摘要
为了完成对金属材料表面缺陷深度的检测,提出了透射法检测与估计表面缺陷深度的方法。基于热弹机制和干涉接收方式,搭建了激光超声检测实验平台,实现了工件表面缺陷的非接触检测,完成了缺陷处的B-scan信号采集和成像,建立了透射系数与表面缺陷深度之间的关系。实验结果表明,由B-scan信号可见缺陷处透射声信号的幅值与表面缺陷深度有关;采用透射系数-表面缺陷深度拟合曲线估计了深度0.3 mm表面缺陷,估计误差为16%,实现了表面缺陷深度的测量。
In order to estimate and detect the surface defect depth of metals, the transmission method of laser ultrasonic surface waves is used in this work. The laser ultrasonic detection platform taking use of thermoelastic mechanism as acoustic signal excitation method and interference receiver as acoustic signal receiver method was built, by which B-scan images of detected specimens with surface defects were collected to establish the relationship between the transmission coefficient and depth of the surface defect. Experimental results show that the amplitude of transmitted acoustic signal is related to the depth of surface defect. At last, a fitted curve of transmission coefficient using measured experimental data is obtained to estimate depth of surface defect on the 6061 aluminum alloy. Furthermore, a surface defect depth of 0.3 mm is estimated by the fitting curve with an estimated error of 16%. Therefore, a experimental method using the transmission method by laser ultrasonic is presented in this paper.
In order to estimate and detect the surface defect depth of metals, the transmission method of laser ultrasonic surface waves is used in this work. The laser ultrasonic detection platform taking use of thermoelastic mechanism as acoustic signal excitation method and interference receiver as acoustic signal receiver method was built, by which B-scan images of detected specimens with surface defects were collected to establish the relationship between the transmission coefficient and depth of the surface defect. Experimental results show that the amplitude of transmitted acoustic signal is related to the depth of surface defect. At last, a fitted curve of transmission coefficient using measured experimental data is obtained to estimate depth of surface defect on the 6061 aluminum alloy. Furthermore, a surface defect depth of 0.3 mm is estimated by the fitting curve with an estimated error of 16%. Therefore, a experimental method using the transmission method by laser ultrasonic is presented in this paper.
引文
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[14] Guan J F,Shen Z H,Ni X W,et al.Numerical study on depth evaluation of micro-surface crack by laser generated ultrasonic waves.Journal of Test and Measurement Technology,2010,24(1):15-21.
[2] Mi B,Ume C.Real-time weld penetration depth monitoring with laser ultrasonic sensing system.Journal of Manufacturing Science & Engineering,2006,128(1):280-286.
[3] Zhao T.The application of environment-friendly cable fireproof materials in substation.Sci-Tech Information Development & Economy,2010,20(32):170-172.
[4] Qian M L.Laser ultrasonic technigue and its applications.Shanghai Measurement and Testing,2003,30(1):4-7.
[5] Luo S,Tan X,Pan M,et al.Progress of laser-generated ultrasonic non-destructive testing technology.Proceedings of SPIE-The International Society for Optical Engineering,2011,8192(3):155.
[6] Qian M L,Zhang W C,Wu T C.Study of characteristics of ultrasound pulse thermoelastically generated by a laser pulse.Chinese Journal of Acoustics,1995,(1):1-10.
[7] Dong L M,Lomonosov A M,Shen Z H,et al.Evaluation of third-order elastic constants using laser-generated multi-type ultrasound for isotropic materials.Ultrasonics,2013,53(6):1079-1083.
[8] Soltani P,Akbareian N.Finite element simulation of laser generated ultrasound waves in aluminum plates.Latin American Journal of Solids & Structures,2014,11(10):1761-1776.
[9] Shen Z H,Xu B Q,Ni X W,et al.Theoretical study on line source laser-induced surface acoustic waves in two-layer structure in ablative regime.Optics & Laser Technology,2004,36(2):139-143.
[10] Park M C.Finite-element analysis of laser-generated ultrasounds for wave propagation and interaction with surface-breaking cracks.Research in Nondestructive Evaluation,2005,16(1):1-14.
[11] He Y J,Zhu R H,Shen Z H,et al.Simulation of laser-induced temperature fields and rayleigh waves in thick Al pipe.Journal of Nanjing University of Science and Technology(Nature Science),2005,29(4):468-471.
[12] He Y J,Zhu R H,Shen Z H,et al.Numerical simulation of laser-generated ultrasonic Lamb waves in cylindrical shell.Opto-Electronic Engineering,2005,32(12):13-16.
[13] Wang W,Zhong Z,Pan Y D.Scattered echo of surface defect in the far field of Rayleigh wave generated by laser.Infrared and Laser Engineering,2015,39(2):157-165.
[14] Guan J F,Shen Z H,Ni X W,et al.Numerical study on depth evaluation of micro-surface crack by laser generated ultrasonic waves.Journal of Test and Measurement Technology,2010,24(1):15-21.