The in-plane dynamic behaviour of hexagonal aluminum honeycombs has been studied in this paper by means of finite element simulation using ABAQUS. Different sized regular cells are arranged in multiple patterns to investigate the localized deformation and the plateau stress under different impact velocities. The influences of multiple cell size arrangements in a honeycomb are investigated for deformation modes and energy absorption in a controlled manner. Deformation modes in the XI direction change significantly with arrangement of different sized cells and impact velocity. Deformation modes are summarized in a mode classification map and an analytical approach is defined to predict the rows pattern to control the deformation modes and densification as per specific application.
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