Axial impact behavior and energy absorption efficiency of composite wrapped metal tubes

Axial impact crushing behavior and energy absorption efficiency of glass/epoxy composite externally wrapped circular metal tubes have been studied in this paper. Predicted instantaneous velocity and displacement formulae are presented and compared with experimental results. Four typical collapse modes are identified, and effects that contribute to the energy absorption capability, such as strain rate, composite wall thickness, fiber ply orientation, and mechanical properties of metals, are studied. By including the influence of the material strain rate effects on metals, the simplified analytical model proposed by Hanefi and Wierzbicki has been extended to impact loadings.