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首页> 外文期刊>Composite Structures >Numerical and experimental studies on propagation of A_0 mode in a composite plate containing semi-infinite delamination: Observation of turning modes
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Numerical and experimental studies on propagation of A_0 mode in a composite plate containing semi-infinite delamination: Observation of turning modes

机译：半无限分层复合板中A_0模式传播的数值和实验研究：车削模式的观察

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摘要

Propagation of the anti-symmetric fundamental Lamb mode (A_o) in a composite laminate containing a semi-infinite delamination was studied through numerical simulations and experimental studies. Here, the wave was generated on a sub-laminate above the delaminated region, and the reflection and transmission of the Lamb modes at the edge of the discontinuity were quantitatively studied. The wave group (named as 'turning mode'), which was made to propagate from one side of the delamination to the other side (through delaminations) was captured and its transmission factor was estimated. Reflection and transmission factors of wave groups were estimated for three different laminates - quasi-isotropic, unidirectional and cross-ply, containing delamination at various interfaces across thickness. Propagation of 'turning modes' were also captured experimentally, employing air-coupled transducers, in quasi-isotropic laminates containing delaminations at different interfaces. Attenuation compensation was incorporated in the experimental signals to improve the comparison of transmission and reflection factors between numerical simulations and experiments.
机译：通过数值模拟和实验研究，研究了包含半无限分层的复合层板中反对称基本Lamb模式（A_o）的传播。在此，在分层区域上方的子层压板上产生了波，并定量研究了不连续边缘处的Lamb模的反射和透射。捕获了从分层的一侧传播到另一侧（通过分层）传播的波组（称为“转向模式”），并估算了其传输因子。估计了三种不同层压板的波群的反射和透射因子-准各向同性，单向和交叉铺层，在整个厚度的各个界面处都包含分层。还使用空气耦合传感器在准各向同性层压板中通过不同界面处的分层实验，捕获了“转向模式”的传播。在实验信号中加入了衰减补偿，以改善数值模拟和实验之间透射和反射因子的比较。

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  • 来源
    《Composite Structures》 |2011年第7期|p.1929-1938|共10页
  • 作者

    C. Ramadas; Krishnan Balasubramaniam; Makarand Joshi; C.V. Krishnamurthy;

  • 作者单位

    Centre for Non-destructive Evaluation and Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai - 600 036, India,Composite Research Center, R&DE (E), Dighi, Pune - 411 015, India;

    Centre for Non-destructive Evaluation and Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai - 600 036, India;

    Composite Research Center, R&DE (E), Dighi, Pune - 411 015, India;

    Department of Physics, Indian Institute of Technology Madras, Chennai - 600 036, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    lamb wave; delamination; turning mode; attenuation; air-coupled transducers;

    机译：兰姆波;分层;转向模式;衰减;空气耦合换能器;

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