'In-plane Dynamic Crushing Behavior and Energy Absorption of Metallic of Honeycomb Core with Unique Combination of Two Regular Hexagonal Cells and Their Arrangements'Ammara Mustafa, Naeem Zafar and Hasan Aftab Saeed 'The densification, energy absorption and deformation mode patterns for a honeycomb core under dynamic in-plane axial crushing is governed by its cell geometry, cells arrangement and impact velocity. In this study, two regular hexagonal cells are combined in such a way that without major modifications in manufacturing process, the in-plane dynamic crushing characteristics of a specific specimen are controlled with major focus on standard deformation modes those are X, V and I deformation modes. The cell geometry itself and arrangement of modified cells pattern in a specimen which may include functional gradient and auxetic features, are numerically studied by means of explicit dynamic finite element simulations using ABAQUS. A cell having a controllable auxetic nature for a period of time along with the regular cell honeycombs (hybrid cell) can give better impact and crushing response. A comparative study of in-plane uniaxial compression loading behavior of regular honeycomb and hybrid cell was performed and deformation and failure modes are investigated under in-plane loading conditions. The effect of cell shape and the negative Poisson?s ratio is evaluated for different impact speeds and energy absorption results are plotted. The results indicate that the inclusion of such cells pattern can guide the deformation modes and alter the energy absorption. This phenomenon is different in different configurations; hence providing a way to define the in-plane crushing and energy absorption control.' |