عنوان مقاله [English]
Impact energy absorption systems in various industries such as automotive and railway have a particular importance to minimize the impact on passengers and enhance vehicle safety. This paper focuses on the bending collapse behavior of thin-walled energy absorber with circular and square cross sections. The theory that is applied is global energy equilibrium and the prevalent bending collapse mode for obtaining the relationship is considered. On the same basis, obtained relations are compared with the published results for the bending strength of tubular structures which were derived from experimental and analytical studies. Subsequently by using the derived bending strength formula, simplified models for circular and square tubes is introduced. The main advantage of these simplified models as a critical modeling technique is dramatically reducing the time of computer simulation in early design stages with the results close to the original model. For this purpose, by axial crash simulation of curved tube by using nonlinear dynamic finite element software LS-DYNA, the results are compared to verify the efficiency of the proposed simplified model and the accuracy of the derived relationship for tube’s bending strength.