Crashworthiness performance of double-hat column made of anisotropic sheet metals under axial impact load

Abstract

This study aims to observe the crashworthiness performance of a double-hat column constructed from anisotropic sheet metals under axial impact conditions. The predicted crashworthiness parameters obtained from numerical simulations were compared with experimental data. Anisotropy was discerned through the examination of three material orientations. The effects of viscoplasticity were rigorously investigated under both quasi-static and dynamic loading conditions. Anisotropy notably exerted a pronounced influence on crucial metrics such as mean crushing force, maximum crushing force, and specific energy absorption. Furthermore, the viscoplastic behavior of the column substantially augmented the structural response, particularly under dynamic loading scenarios. Notably, the anisotropic-viscoplastic model exhibited superior accuracy compared to its isotropic counterpart, thereby underscoring its efficacy in capturing intricate material characteristics. This study underscores the critical significance of accounting for geometric imperfections to ensure precise predictions of deformation shapes and crashworthiness performance.