Lamb wave interaction with composite delamination
Lamb wave interaction with composite delamination
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DOI：
10.1016/j.compstruct.2018.08.072
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发表时间：
2018-12-15
影响因子：
6.3
通讯作者：
Gopalakrishnan, S.
中科院分区：
文献类型：
--
作者：
Munian, Rajendra Kumar;Mahapatra, D. Roy;Gopalakrishnan, S.
基于弹性导波的分层损伤检测是一种有效的方法。本文采用时域谱有限元法（TSFE）模拟了复合材料层合板中导波与脱层的相互作用。研究了不同脱层位置对波的散射。研究了分层附近不同分层位置的波场，为进一步表征和关联携带分层参数特征的远场波包提供了依据。复合材料层合板中的离轴脱层引起了弹性动力学应力传递的不对称性。它导致波模式转换。研究了分层对波长的敏感性。这项研究的结果表明，潜在的可能性，使用频率-波长的信息来区分各种尺寸的分层。散射波的能量和由于缺陷引起的波能量的耗散/转换取决于子层合板的共振特性。分析了纵向分层和边缘分层对波散射的影响。参考缺陷量化问题分析信号中的谐振模式。
Elastic guided wave based evaluation is useful to detect delamination in composites. This paper reports a detailed account of guided wave interaction with delamination in laminated composites modeled using time domain spectral finite element (TSFE) method. Wave scattering due to different delamination positions is studied. Wave field near the delamination in different layer-wise positions is investigated, which is useful to further characterize and correlate the far field wave packet carrying the parametric signature of delamination. Off-axis delamination in composite laminate creates an asymmetry in the elastodynamic stress transfer. It leads to wave mode conversions. Sensitivity of the delamination to the wavelengths is studied. The outcome of this study indicates potential possibilities to use frequency-wavelength information to discriminate various sizes of delamination. Energy of the scattered waves and dissipation/conversion of the wave energy due to the defects depend on the resonance characteristics of the sub-laminates. Wave scattering effect due to length-wise multiple delaminations and edge delamination is also analyzed. The resonance patterns in the signals are analyzed with reference to the defect quantification problem.