高温下表面波测量亚表面缺陷宽度的数值模拟
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摘要
为了实现激光超声技术对不同温度下亚表面缺陷宽度的定量检测,本文采用了有限元法模拟了激光激发表面波与亚表面缺陷的作用,并提出了一种利用表面波定量计算亚表面缺陷宽度的方法。首先在亚表面缺陷的一侧产生表面波,然后在另一侧产生表面波,最后分别在两侧检测到来自在亚表面缺陷的入射和反射表面波。当亚表面缺陷处于一个表面波波长的作用范围内时,基于入射和反射表面波的到达时间可实现计算亚表面缺陷宽度。数值结果与理论结果吻合良好,为高温下采用激光超声技术定量计算亚表面缺陷宽度提供了一种十分有效的数值方法。
In order to realize the quantitative detection of subsurface defect width by laser ultrasound technology at different temperatures,the finite element method is employed to simulate the interaction of subsurface defect with laser-generated surface waves in the paper,and then a method to calculate the width of the subsurface defect using surface waves is presented. First,surface waves are first generated on one side of the subsurface defect and then on the other side. Finally,incident and reflected surface waves from subsurface defect are detected on both sides of the defect in the two detections,respectively. When the subsurface defect is within a wavelength range of the surface wave,the subsurface defect width can be calculated based on the arrival time of incident and reflected surface waves. The numerical results are in good agreement with the theoretical results,which provides a very effective numerical method for quantitatively calculating the subsurface defect width using laser ultrasound technology at high temperature.
In order to realize the quantitative detection of subsurface defect width by laser ultrasound technology at different temperatures,the finite element method is employed to simulate the interaction of subsurface defect with laser-generated surface waves in the paper,and then a method to calculate the width of the subsurface defect using surface waves is presented. First,surface waves are first generated on one side of the subsurface defect and then on the other side. Finally,incident and reflected surface waves from subsurface defect are detected on both sides of the defect in the two detections,respectively. When the subsurface defect is within a wavelength range of the surface wave,the subsurface defect width can be calculated based on the arrival time of incident and reflected surface waves. The numerical results are in good agreement with the theoretical results,which provides a very effective numerical method for quantitatively calculating the subsurface defect width using laser ultrasound technology at high temperature.
引文
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[14] Touloukian Y S,Kirky R K,Taylor R E.Thermophysical properties of matter,thermal expansion:metallic elements and alloys[M].New York:Plenum Press,1975.
[2] PEI Cuixiang,YI Dongci,LIU Wenwen,et al.Numerical simulation of laser ultrasonic nondestructive testing of internal defects in PBX[J].Chinese Journal of Energetic Materials,2017,25(10):822-828.(in Chinese)裴翠祥,弋东驰,刘文文,等.PBX内部缺陷激光超声无损检测数值模拟[J].含能材料,2017,25(10):822-828.
[3] SUN Kaihua,SHEN Zhonghua,LI Yuanlin,et al.Inspection of material internal defects using double shadow method based on laser ultrasonic reflected shear waves[J].Chinese Journal of Lasers,2018,45(7):243-251.(in Chinese)孙凯华,沈中华,李远林,等.材料内部缺陷的激光超声反射横波双阴影检测方法[J].中国激光,2018,45(7):243-251.
[4] GUO Haiyang,XU Zhixiang,LIU Zhiyi,et al.Laser ultrasonic test for defects of metal plate with coating[J].Laser & Infrared,2017,47(5):541-547.(in Chinese)郭海洋,徐志祥,刘志毅,等.带涂层金属板件缺陷的激光超声检测研究[J].激光与红外,2017,47(5):541-547.
[5] ZHAO Yan,YAN Wei,SHEN Zhonghua,et al.Numerical simulation of elastic wave interaction with surface-breaking defects[J].Laser Technology,2010,34(1):91-94.(in Chinese)赵艳,严伟,沈中华,等.弹性声波与表面缺陷相互作用的数值模拟[J].激光技术,2010,34(1):91-94.
[6] ZHOU Zhengan,ZHANG Kuanshuang,ZHOU Jianghua.Application of laser ultrasonic technique for non-contact detection of structural surface-breaking cracks[J].Optics & Laser Technology,2015,73:173-178.
[7] GUO Hualing,ZHENG Bin,LIU Hui.Numerical simulation and experimental research on interaction of micro-defects and laser ultrasonic signal[J].Optics and Laser Technology,2017,96:58-64.
[8] WANG Wei,ZHONG Zheng,PAN Yongdong.Scattered echo of surface defect in the far field of Rayleigh wave generated by laser[J].Laser Technology,2015,39(2):157-165.(in Chinese)王威,仲政,潘永东.激光远场激发表面波在开口缺陷处的散射回波[J].激光技术,2015,39(2):157-165.
[9] JIN Lei,WANG Wei,PAN Yongdong.Theoretical study of the interaction of laser excited surface acoustic waves with subsurface defects[J].Chinese Journal of Solid Mechanics,2017,38(2):170-179.(in Chinese)金磊,王威,潘永东.激光激发表面波与亚表面缺陷作用的理论研究[J].固体力学学报,2017,38(2):170-179.
[10] ZENG Wei,WANG Haitao,TIAN Guiyun,et al.Research on the oscillation effect of near-surface metal defect based on laser-generated acoustic surface wave[J].Acta Physica Sinica,2015,64(13):200-205.(in Chinese)曾伟,王海涛,田贵云,胡国星,汪文.研究激光激发的声表面波与材料近表面缺陷的振荡效应[J].物理学报,2015,64(13):200-205.
[11] WANG Jijun,SHEN Zhonghua,NI Xiaowu,et al.Width gauging of surface slot using laser-generated Rayleigh waves[J].Optics & Laser Technology,2007,92:15-18.
[12] LI Kesi,MA Zhiyuan,FU Pan,et al.Quantitative evaluation of surface crack depth with a scanning laser source based on particle swarm optimization-network[J].NDT and E International,2018,98:208-214.
[13] Paul M,Haberer B,Arnold W.Materials characterization at high temperatures using laser ultrasound[J].Materials Science and Engineering A,1993,168(1):87-92.
[14] Touloukian Y S,Kirky R K,Taylor R E.Thermophysical properties of matter,thermal expansion:metallic elements and alloys[M].New York:Plenum Press,1975.