In-plane dynamic impact response characteristics of periodic 4-point star-shaped honeycomb structures

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (23) : 223-231.

HAN Hui-long, ZHANG Xin-chun

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Abstract

The in-plane dynamic impact response behaviors of periodic 4-point star-shaped honeycomb structures were numerically studied by means of the explicit dynamic finite element (EDFE) simulation method. Under the promise of cell element’s wall length keeping unchanged, the FE model of periodic 4-point star-shaped honeycombs was established by changing micro-cell structure parameters including cell wall thickness, angle between inner concave arrow nodes, and ligament length. Then the influences of impact velocity and micro-cell structural parameters on in-plane macro-/micro-deformation behaviors, densification strains and dynamic impact intensities of star-shaped honeycombs were discussed in detail. The results showed that the specimens reveal a “necking” phenomenon of negative Poisson ratio materials under impact loading with low or moderate velocity, it is mainly due to cell walls bear the combination of membrane force and bending moment; based on the energy absorption efficiency method and the one-dimensional shock wave theory, empirical formulae for densification strain and dynamic plateau stress of the honeycombs were deduced to predict the dynamic load-bearing capacity of star-shaped honeycombs. The results provided a new idea for the multi-objective optimization design of dynamic impact properties of stretch cell materials.

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4-point star-shaped honeycomb structure / negative Poisson ratio (NPR) / densification strain / plateau stress / micro-cell structure

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HAN Hui-long, ZHANG Xin-chun. In-plane dynamic impact response characteristics of periodic 4-point star-shaped honeycomb structures[J]. Journal of Vibration and Shock, 2017, 36(23): 223-231

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