Identification of impact damage in sandwich composites by acoustic camera detection of leaky Lamb wave mode conversions
Identification of impact damage in sandwich composites by acoustic camera detection of leaky Lamb wave mode conversions
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通过声学摄像机检测泄漏兰姆波模式转换来识别夹层复合材料的冲击损伤
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
M. Wevers
中科院分区：
文献类型：
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作者：
H. Pfeiffer;Magdalena Böck;Ioannis Pitropakis;A. Szewieczek;W. Hillger;C. Glorieux;M. Wevers
目前的可行性研究表明，可以通过绘制兰姆波与损伤引起的结构异质性的相互作用来识别夹层复合材料中的冲击损伤。通过诱导快速兰姆模式 S0 到慢速模式 A0 的模式转换，损伤部位充当机载超声的辅助声源，可以通过声学相机检测到。这种辐射最终通过 A0 模式下的粒子位移的极化来实现，该模式在低超声波频率下垂直于板表面。
The present feasibility study demonstrates that impact damage in a sandwich composite can be identified by mapping the interaction of Lamb waves with the damage-induced structural heterogeneity. By inducing mode conversion of the fast Lamb mode, S0, into the slow mode, A0, the damage site acts as a secondary acoustic source of airborne ultrasound, which can be detected by an acoustic camera. This irradiation is finally enabled by the polarisation of the particle displacements in the A0 mode which is oriented perpendicular to the plate surface at low ultrasonic frequencies.