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This article presents the finite element simulations for the crash characteristics and the energy absorption of thin longitudinal members of square and rectangle cross-sections using steel and aluminum as materials. Specific energy absorption and Peak forces experienced are the main variables considered in the analysis. Square shape provides a 16% increase in specific energy absorption and 15% rise in peak force experienced as compared to the rectangular shape, while use of aluminum reduces the weight by 63% consequently there is a decrease in both specific energy absorption by 24% and peak force experienced by the longitudinal member by 64%.