Localization of low-velocity impact on a composite honeycomb sandwich structure

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (2) : 67-71,1.

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Localization of low-velocity impact on a composite honeycomb sandwich structure

Zhao Lin-hu; Zhou Li

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Abstract

Low-velocity impact tests are performed on a carbon fiber reinforced composite honeycomb sandwich structure, and a localization method using stress wave and immune genetic algorithms (IGA) is used to analyze and locate the low-velocity impact on this composite structure. First, after obtaining a set of impact-induced stress wave signals from pre-determined impact tests, wavelet transform is applied to analyze these stress wave signals in the time-frequency domain to obtain the propagation velocity of the impact-induced stress waves in the composite structure. Then, considering the anisotropic properties of stress wave propagation in composite honeycomb structure, IGA is employed to identify the location of unknown low-velocity impact. Experimental results have demonstrated the applicability and effectiveness of the impact localization method.

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Composite honeycomb sandwich structure / localization of low-velocity impact / stress wave / immune genetic algorithms

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Zhao Lin-hu;Zhou Li. Localization of low-velocity impact on a composite honeycomb sandwich structure[J]. Journal of Vibration and Shock, 2012, 31(2): 67-71,1