Geometric configuration and parametric evaluation of auxetic meta-materials for enhanced plastic energy dissipation in blast scenarios

The prevailing risk factors and explosion scenarios in Electric Vehicles (EVs) necessitated this research to focus on the analysis and optimization of auxetic patterns encompassing re-entrant, double re-entrant, and triangular structures under blast loading conditions. In this study, a comprehensive blast analysis has been conducted numerically using ABAQUS on auxetic meta-materials featuring re-entrant, double re-entrant, and triangular structures with varying strut angles (85°, 80°, 75°) and strut thickness. Their performances have been compared among them and also with a traditional solid plate. Among these auxetic structures, the double re-entrant structure with 85o strut angle and 0.2 mm strut thickness outperformed other auxetic structures with a minimal bottom plate displacement of 3.4 mm and plastic dissipation energy of 0.171 kJ. The consistent behavior of these structures has been substantiated by conducting blast analysis with a reduced stand-off distance of 30 mm. The simulation results are then compared with the results of the 50 mm stand-off distance for deformation, plastic dissipation energy, and velocity.