Mushrooming of circular tubes under dynamic axial loading

摘要: Extensive studies on axial crushing of cylindrical shells have been carried out due to their wide applications for crashworthiness. Most the conducted under static and low speed impact conditions predict deforming mechanism, resulting in typical progressive buckling dynamic plastic buckling, from which energy absorption capacity structural component can be predicted. Though effect strain rate, inertia stress wave propagation all considered determine modes, present study concentrates a different mechanism higher impact, where mushrooming, or thickening shell wall is observed. Both experimental finite element (FE) simulations were out. It was found that mushrooming an important feature high but results show leads tensile fracture mushroomed regions lack suitable models FE codes hinders full understanding problem.