Axial Crush of Metallic and Hybrid Energy Absorbing Thin-walled Tubes with Polygonal Cross-sections: Numerical Analysis

Material properties and geometry are two important design parameters which their effects should beconsidered in a crashworthiness analysis. In this paper, the axial impact of metallic and hybrid energyabsorbing thin-walled tubes with poly-gonal cross-section is simulated using LS-DYNA software. Thecombined effects of changing the geometry and material properties on the mass specific energy absorption(MSEA) as well as the mean and maximum crush forces are investigated. To compare the results, allmetallic tubes have identical thickness, length, and circumference. The hybrid tubes are made of the samemetallic tubes which are reinforced with special composite overlays. These materials are intentionallyselected in such a way that the effects of yield strength and Young’s modulus can be separatelyinvestigated. The results show that, in contrast with the current belief, there are some metallic and hybridtubes with non- circular cross-section shapes, which have better mass specific energy absorptioncapabilities than the circular ones during the impact.