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首页> 外文会议>Asia-Pacific workshop on structural health monitoring >Scattering of the fundamental anti-symmetric Lamb wave by a mid-plane edge delamination in a fiber-composite laminate
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Scattering of the fundamental anti-symmetric Lamb wave by a mid-plane edge delamination in a fiber-composite laminate

机译：通过纤维复合层压板中的半平面边缘分层散射基本抗对称羊波

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This paper investigates the scattering of the fundamental anti-symmetric Lamb wave mode by a delamination along the edge of a quasi-isotropic fiber-composite laminate. Delaminations pose a serious threat to the structural integrity of composite laminates as they often show no visible signs of damage on the surface. Due to the anisotropic nature of composites, analytical solutions are often complicated to derive for such problems. This investigation uses 3D Finite Element (FE) analysis and experimental tools to characterize the scatter by a mid-plane delamination in composites. A 5.5 cycle Harm windowed wave train was used as the input signal for both FE and experiments. A 2D Fast Fourier Transform was used to identify the mode and amplitude of the scattered field along various scattered directions. The experimental wave field image was captured using a 3D Laser Vibrometer. The results indicate that the scatter pattern is much more complex than previously obtained results for an isotropic plate. Even for the simple case of mid-plane delamination, the fiber steering effects in the outermost plies have a significant effect on the scattering pattern, relative to the isotropic case where the dominant part of the scattered field is an edge-guided wave. Computational and experimental results are presented for the scattering pattern and scattering amplitude as a function of damage size relative to wavelength. The implications of these results for the optimal placement of actuators and sensors for Structural Health Monitoring (SHM) purposes, and for devising effective approaches for the inverse problem of damage detection and sizing, are briefly discussed.
机译：本文通过沿准各向同性纤维复合层压板边缘的分层来研究基本抗对称羊波模式的散射。 DELAMINATIONS对复合层压板的结构完整性构成严重威胁，因为它们通常在表面上没有显示出损伤的可见迹象。由于复合材料的各向异性性质，分析解决方案通常是复杂的，以导出这种问题。本研究使用3D有限元（FE）分析和实验工具来表征复合材料中的中间平面分层的散射。 5.5周期伤害窗口波动火车用作FE和实验的输入信号。 2D快速傅里叶变换用于沿各种散射方向识别散射场的模式和幅度。使用3D激光振动计捕获实验波场图像。结果表明散射图谱比以前获得各向同性板的结果更复杂。即使对于中平面分层的简单情况，最外层帘布层中的光纤转向效果也对散射图案具有显着影响，相对于散射场的主要部分是边缘引导波的各向同性情况。散射图案和散射幅度的计算和实验结果作为相对于波长的损坏尺寸的函数呈现散射图案和散射幅度。简要讨论了这些结果对致动器和传感器的最佳放置，以及用于设计损坏检测和尺寸的逆问题的有效方法的致动器和传感器的最佳放置。

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