Dynamic Progressive Buckling of Square Tubes under Axial Impact Loading

In this paper، previous analytical models for analyzing dynamical progressive buckling of square tubes under axial loading have been modified. In the improved model، the dissipated energy due to shortening of tube walls and the effects of inertia of previous folding layers are considered. The mean crushing force، which is predicted by the analytical model، has acceptable consistency with the results of experimental tests and in most cases their accuracy is higher. Based on the results of this paper، it is observed that the impact velocity and the mass of striker (neglected in pervious analytical models) are important in mean crush force and in absorb energy of a square tube.