激光超声表面波在表面缺陷上的反射与透射
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摘要
采用激光超声可视化技术研究了脉冲激光激励的表面波在不同深度缺陷上的反射和透射,实验得到了表面波在缺陷处的可视化声场。研究结果表明,随着缺陷深度的增大,表面波的反射系数先增大后平缓变化,透射系数先减小后平缓变化。研究结果为裂纹深度的激光超声表面波检测奠定了实验基础。
The laser ultrasonic visualization technology is used to study the reflection and transmission of pulsed laser excited surface waves on the defects with different depths.The visualized sound field of the surface wave at the defects is obtained experimentally.The research results show that as the defect depth increases,the reflection coefficient of surface wave first increases and then changes steadily,and however the transmission coefficient first decreases and then changes smoothly.These research results lay an experimental foundation for the quantitative detection of cracks by laser ultrasonic surface waves.
The laser ultrasonic visualization technology is used to study the reflection and transmission of pulsed laser excited surface waves on the defects with different depths.The visualized sound field of the surface wave at the defects is obtained experimentally.The research results show that as the defect depth increases,the reflection coefficient of surface wave first increases and then changes steadily,and however the transmission coefficient first decreases and then changes smoothly.These research results lay an experimental foundation for the quantitative detection of cracks by laser ultrasonic surface waves.
引文
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[2]Clorennec D,Royer D,Walaszek H.Nondestructive evaluation of cylindrical parts using laser ultrasonics[J].Ultrasonics,2002,40(1/2/3/4/5/6/7/8):783-789.
[3]Bernstein J R,Spicer J B.Hybrid laser/broadband EMAT ultrasonic system for characterizing cracks in metals[J].Journal of the Acoustical Society of America,2002,111(4):1685-1691.
[4]Arias I,Achenbach J D.A model for the ultrasonic detection of surface-breaking cracks by the scanning laser source technique[J].Wave Motion,2004,39(1):61-75.
[5]Zhan Y,Liu C S,Kong X W,et al.Experiment and numerical simulation for laser ultrasonic measurement of residual stress[J].Ultrasonics,2017,73:271-276.
[6]Manzo A J,Kenderian S,Helvajian H.Application of laser ultrasonic non-destructive evaluation technique to additive manufacturing[J].Proceedings of SPIE,2016,9738:973810.
[7]Domarkas V,Khuri-Yakub B T,Kino G S.Length and depth resonances of surface cracks and their use for crack size estimation[J].Applied Physics Letters,1978,33(7):557-559.
[8]Kromine A K,Fomitchov P A,Krishnaswamy S,et al.Laser ultrasonic detection of surface breaking discontinuities:scanning laser source technique[J].Materials Evaluation,2000,58(2):173-177.
[9]Cho Y,Rose J L.An elastodynamic hybrid boundary element study for elastic guided wave interactions with a surface breaking defect[J].International Journal of Solids and Structures,2000,37(30):4103-4124.
[10]Li L B,Li L B,Hu H S,et al.Ultrasonic field laser visual inspection method[C]∥China Western Acoustical Academic Exchange Conference,Dunhuang:[s.n.],2013.李立兵,李立兵,胡灏石,等.超声场的激光可视化检测方法[C]∥中国西部声学学术交流会.敦煌:[出版者不详],2013.
[11]Yashiro S,Takatsubo J,Miyauchi H,et al.A novel technique for visualizing ultrasonic waves in general solid media by pulsed laser scan[J].NDT&EInternational,2008,41(2):137-144.
[12]Sui X L,Xiao X,Qi H Y,et al.Influence of residual stress on young modulus detection of SiO2 bulk materials by laser-induced surface ultrasonic wave technique[J].Laser&Optoelectronics Progress,2017,54(12):121202.睢晓乐,肖夏,戚海洋,等.残余应力对激光激发超声表面波技术检测二氧化硅体材料杨氏模量的影响[J].激光与光电子学进展,2017,54(12):121202.
[13]Zhu H L,Liu C,Zhang B,et al.Research on laser ultrasonic visual image processing[J].Chinese Journal of Lasers,2018,45(1):0104004.朱洪玲,刘畅,张博,等.激光超声可视化图像处理研究[J].中国激光,2018,45(1):0104004.
[14]Guan J F,Shen Z H,Xu B Q,et al.Finite element analysis of laser-generated Rayleigh wave scattering by cracks in a plate[J].Acta Photonica Sinica,2005,34(8):1128-1132.关建飞,沈中华,许伯强,等.激光激发声表面波在缺陷板材中散射过程的有限元分析[J].光子学报,2005,34(8):1128-1132.
[15]Li Y,Cai G X,Dong R Q.The reflection and transmission of Lamb waves at overlap joints[J].Acta Acustica,2017,42(4):495-503.李阳,蔡桂喜,董瑞琪.兰姆波在搭接焊缝上的反射和透射[J].声学学报,2017,42(4):495-503.