Abstract
Abstract In this study, finite element analysis was performed to investigate the feasibility of multi-layered pyramidal truss structures as a filler material of energy absorbing tubes. Rectangular tubes with the filler and empty tubes were compressed at a constant velocity of 10km/h and their energy absorbing capabilities were compared to demonstrate the structural benefit of filling materials in the tubes. Additionally, the compressive response of the multi-layered pyramidal truss structures without tube wall constraint were observed. The investigations included three tube wall thicknesses and three pyramidal truss structures with three relative densities by varying the inclination angle of the pyramidal truss strut. Those were made of Al6063T5 and 304 stainless steel (SS304) for tube wall and pyramidal truss structure, respectively. The results indicate that the energy absorption capability of the tube with the filling exceeds the simple sum of that of tube and that of the filler, and this is due to the interaction effect between outer tubes and pyramidal truss struts near the tube wall. Furthermore, the inclination angle of pyramidal truss struts influences energy absorption. Thus, the pyramidal truss structures can be potentially applied as a filler material for energy absorbing structures.
Highlights
Passive energy dissipation devices absorb a portion of energy transmitted to passengers from vehicle collisions
We examined the feasibility of multi-layered pyramidal truss structures as an inner material of filled crashbox without considering the optimization of material distribution
From the numerical simulations of empty tubes, multi-layered truss cores, and periodic cellular metals (PCMs)-filled tubes, following conclusions were obtained: 1. Given the interaction effect between outer tubes and PCM struts near the tube, the energy absorption capability of the integrated structure exceeds the sum of capabilities of individual components
Summary
Passive energy dissipation devices absorb a portion of energy transmitted to passengers from vehicle collisions. The parent materials comprising of the tubes as well as cross sectional shapes are of interest Fundamental material response, such as strain hardening, strain rate sensitivity, and fracture mode, influences the collapse modes and energy absorbing mechanisms of the structure (Ronchietto et al, 2009), and the tubes made of annealed steel (Velmururugan and Muralikannan, 2009), extruded aluminum alloy (Goel, 2015), composite A multi-layered pyramidal truss structure that corresponds to periodic cellular metal (PCM), is introduced for a filler material of crash boxes. The present study performed numerical simulations in order to understand the deformation mechanism and quantify the amount of interactions between the outer tube and multi-layered pyramidal truss structures (PCMs).
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