Vibration characteristics analysis and crack identification for a truss core sandwich beam with skin crack

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (5) : 155-162.

CHEN Jian-en, SHI Yue-qi, LIU Jun, GE Wei-min, WANG Xiao-feng

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Abstract

Vibrations of a pyramidal truss core sandwich beam with a skin breathing crack were investigated. Based on the zig-zag theory of sandwich structures, considering stiffness’s periodic variation due to breathing effect of crack, the system’s dynamic equations were derived. The effects of crack’s depth and location on the system’s natural frequencies were analyzed, and the influences of crack parameters on forced vibration responses of the sandwich beam were investigated with frequency response curves, waveforms and phase diagrams. The results indicated that super-harmonic responses of the sandwich beam are sensitive to crack parameters; geometric features of phase diagrams can be used to identify crack parameters.

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vibration analysis / truss core sandwich structure / breathing crack / additional flexibility

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CHEN Jian-en, SHI Yue-qi, LIU Jun, GE Wei-min, WANG Xiao-feng. Vibration characteristics analysis and crack identification for a truss core sandwich beam with skin crack[J]. Journal of Vibration and Shock, 2018, 37(5): 155-162

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