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机械工程学报

机械工程学报 ›› 2017, Vol. 53 ›› Issue (12): 60-69.doi: 10.3901/JME.2017.12.060

• 承压设备的无损检测与评价 • 上一篇    下一篇

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基于赫兹接触的板中微裂纹非线性兰姆波检测方法研究

焦敬品, 孟祥吉, 吕洪涛, 吴斌, 何存富   

  1. 北京工业大学机械工程与应用电子技术学院 北京 100124
  • 出版日期:2017-06-20 发布日期:2017-06-20
  • 作者简介:

    焦敬品，女，1973年出生，博士，教授，博士研究生导师。主要研究方向为现代测控技术与方法、无损检测新技术、现代信号分析与处理、新型传感器。

    E-mail：jiaojp@bjut.edu.cn

  • 基金资助:
    * 国家自然科学基金(11572010，11272017)和国家重点研发计划(2016YFF- 0203002)资助项目; 20161207收到初稿，20170419收到修改稿;

Nonlinear Lamb Wave Second Harmonic Technique for Micro-crack Detection in Plates Based on Theory of Hertz Stress

JIAO Jingpin, MENG Xiangji, Lü Hongtao, WU Bin, HE Cunfu   

  1. College of Mechanical Engineering and Application Electronics Technology，Beijing University of Technology， Beijing 100124
  • Online:2017-06-20 Published:2017-06-20

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338

摘要：

针对金属板结构中微裂纹检测问题，进行基于二次谐波的非线性兰姆波检测方法研究。基于赫兹接触理论，进行板中二次谐波非线性兰姆波理论研究，建立板中兰姆波二次谐波与微裂纹尺寸的关系模型。进行板中微裂纹非线性兰姆波数值仿真，研究不同长度和宽度的微裂纹对兰姆波二次谐波非线性效应的影响。结果表明，随着微裂纹长度增加，二次谐波幅值呈增加趋势;随着微裂纹宽度增加，二次谐波幅值呈减小趋势。在以上研究基础上，进行板中微裂纹非线性兰姆波检测试验研究。结果表明，通过测量结构的兰姆波二次谐波非线性系数，可用于结构中微裂纹检测与定量评价。研究工作为板中微裂纹定量检测做了有益探索。

关键词: 二次谐波, 非线性兰姆波, 赫兹接触理论, 无损检测, 微裂纹

Abstract:

For the metal plate structure in micro crack detection problem, the thesis of the second harmonic of the nonlinear Lamb wave detection method research based on. First, the board in the second harmonic nonlinear Lamb wave theory is used to study, analyses the influence of the micro crack width and length of second harmonic excitation efficiency, and through the numerical simulation of nonlinear effect of different length and width of the micro crack and the Lamb wave interaction. The results show that with the increase of micro crack length, the two harmonic amplitude increases and the two harmonic amplitude decreases with the increase of the micro crack width. Based on the above research, the plate crack in nonlinear Lamb wave detection experiments. The results show that by measuring structure of Lamb wave second harmonic nonlinearity coefficient, for structure of micro crack detection and quantitative evaluation. The research work is a useful exploration for the quantitative detection of micro cracks in the plate.

Key words: nondestructive testing, nonlinear Lamb wave, second harmonic, theory of Hertz stress, micro crack

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