Dynamic crushing behavior of honeycomb structures with irregular cell shapes and non-uniform cell wall thickness

By K. Li, Xin-Lin Gao, Jyhwen Wang. 2007

163 citations recorded by the source corpus.

Abstract Dynamic crushing responses of honeycomb structures having irregular cell shapes and non-uniform cell wall thickness are studied using the Voronoi tessellation technique and the finite element (FE) method. FE models are constructed for such honeycomb structures based on Voronoi diagrams with different degrees of cell shape irregularity and cell wall thickness non-uniformity. The plateau stress, the densification strain energy and the initiation strain are determined using the FE models. Simulation results reveal that the “X” and “V” shaped deformation modes evident in a perfectly ordered honeycomb at low or moderate impact velocities are disrupted as cell shapes become irregular and/or cell wall thickness gets non-uniform. The “I” shaped deformation mode is clearly seen in all honeycomb structures at high impact velocities. Both the plateau stress and the densification strain energy are found to decrease as the degree of cell shape irregularity or the degree of cell wall thickness non-uniformity increases, with the weakening effect induced by the presence of non-uniform cell wall thickness being more significant. When the two types of imperfections co-exist in a honeycomb structure, the interaction between them is seen to exhibit a complicated pattern and to have a nonlinear effect on both the plateau stress and the densification strain energy. It is also found that stress waves propagate faster in a honeycomb structure having irregular cell shapes and slower in a honeycomb structure having non-uniform cell wall thickness than in a perfectly ordered honeycomb. Finally, the strain hardening of the cell wall material is seen to have a strengthening effect on the plateau stress, which is more significant for perfectly ordered honeycombs than for imperfect honeycomb structures.

Subfields: Biomedical Engineering, Mechanical Engineering, Pulmonary and Respiratory Medicine

View Paper: https://www.semanticscholar.org/paper/8604e300644f3e6f57181ae7c58ff507f0b63f34

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In Biomedical Engineering

In Mechanical Engineering

In Pulmonary and Respiratory Medicine

Citations in the corpus

Dynamic crushing and energy absorption of regular, irregular and functionally graded cellular structures (2011, background): “Our numerical simulations showed three distinct crushing modes for honeycombs with a constant relative density: quasi-static, transition and dynamic.”
Dynamic compressive behaviour of cellular materials: A review of phenomenon, mechanism and modelling (2018, unknown): “In the subsequent studies, it has been shown that the morphology [28-35], topology [36-39] and defects [40-46] of cell structure can also significantly affect the bulk properties.”
A numerical study on the rate sensitivity of cellular metals (2009, background): “Reid and Peng (1997) found that the ‘‘shock-enhanced” plateau stress in wood is simply given by r ¼ r0 þ Av2: ð11Þ It is found that this relation is also valid for regular honeycombs (Harrigan et al., 1999; Ruan et al., 2003), irregular honeycombs (Li et al., 2007) and foams (Tan et al., 2005a).”
Equivalent in-plane elastic properties of irregular honeycombs: An analytical approach (2016, background): “Dynamic crushing behaviour of honeycomb structures with irregularity in cell shapes and cell wall thickness have been investigated in (Li et al., 2007).”