表面裂纹的激光超声深度测量
Laser Ultrasonic Depth Measurement of Surface Cracks
摘 要
采用激光超声检测技术对不同深度的铝合金6061表面微裂纹进行了检测。通过搭建激光超声检测试验平台，得到不同缺陷深度的表面裂纹的缺陷信号，分析了缺陷信号的时域信号特征。研究表明：利用反射回波的震荡时间差可以定量评估裂纹深度，从而实现金属表面微裂纹深度的定量检测；通过检测不同深度的Q235钢的表面缺陷，证明了利用震荡时间差定量检测表征缺陷深度的正确性，研究结果具有一定的应用价值。
表面裂纹
震荡时间差
深度检测
laser ultrasonic
surface crack
oscillation time difference
depth measurement
Abstract
In this paper, the surface microcrack detection of aluminum alloy 6061 with different depths was studied by laser ultrasonic detection technology. The defect signals of surface cracks with different depths were obtained by building a laser ultrasonic testing platform. The characteristics of the defect signals in time domain were analyzed. The results show that:the crack depth can be qualitively assessed by using the time difference of reflection echo, so that the quantitative detection of micro-crack depth on metal surface can be realized; by testing the surface defects of steel Q235 at different depths, the correctness of using oscillating time difference to quantitatively detect and characterize the defect depth is proved. The research results of this paper have potential application value.
中图分类号 TG115.28 DOI 10.11973/wsjc201909006
所属栏目 无损检测新技术发展与应用专题
基金项目 国家自然基金资助项目（11604304）；山西省青年科技研究基金资助项目（201701D12111457）；山西省自然科学基金资助项目（201801D121160）
收稿日期 2019/3/8
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备注吴瑞(1995-),女,硕士研究生,主要研究方向为激光超声无损检测
引用该论文: WU Rui,LI Haiyang,WANG Zhaoba,PAN Qianghua,WEI Zhuangzhuang. Laser Ultrasonic Depth Measurement of Surface Cracks[J]. Nondestructive Testing, 2019, 41(9): 24～27
吴瑞,李海洋,王召巴,潘强华,魏壮壮. 表面裂纹的激光超声深度测量[J]. 无损检测, 2019, 41(9): 24～27
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参考文献
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【2】周正干,孙广开,李征,等. 激光超声检测技术在复合材料检测中的应用[J].哈尔滨理工大学学报,2012,17(6):119-122.
【3】赵添. 激光超声无损检测技术研究[J]. 科技情报开发与经济, 2010(32):170-172.
【4】NI C Y, WANG L J, SHEN Z H, et al. A study of surface breaking crack evaluating by using scanning laser source-dual laser source technique[J]. Nondestructive Testing and Evaluation, 2010, 25(2):111-123.
【5】严刚,徐晓东,沈中华,等.激光超声表面缺陷检测的实验方法[J].光电子·激光,2006,17(1):107-110.
【6】曾伟, 王海涛, 田贵云, 等. 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.
【7】GUAN J F, SHEN Z H, NI X W, et al. Numerical simulation of the reflected acoustic wave components in the near field of surface defects[J]. Journal of Physics D:Applied Physics, 2006, 39(6):1237-1243.
【8】倪辰荫, 石一飞, 沈中华, 等. 激光激发材料中近场声表面波的数值模拟[J]. 红外与激光工程, 2007, 36(z1):592-595.
【9】LOPEZ-SANCHEZ A,SCHMERR L W.Ultrasonic nondestructive measurement systems models and measurements[J].Key Engineering Materials, 2006, 5:321-323.
【10】WU K T, JEN C K, KOBAYASHI M, et al. Integrated piezoelectric ultrasonic receivers for laser ultrasound in non-destructive testing of metals[J]. Journal of Nondestructive Evaluation, 2011, 30(1):1-8.
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