Effects of geometrical and physical parameters on axial impact buckling behaviour of elastic–plastic cylindrical shells

摘要

The buckling behaviour and collapse mechanism of elastic–plastic cylindrical shells subjected tonlongitudinal impact were studied by impact experiments and computer simulations. Attention wasnfocused on the influence of the geometry and material property of the shell and loading conditionnon dynamic buckling response. Varieties of bucking models and the switching between thenmodes in buckling process were observed. Particularly, the phenomenon of so called dynamicnplastic buckling in relatively low impact velocity was captured by high speed photograph innimpact test of cooper specimen. This experimentally confirms that the dynamic plastic bucklingndoes not necessarily require high impact velocity. The whole process of impact buckling wasnsimulated by LS-DYNA code. The effects of the stress wave and the transverse inertia and plasticnhardening modulus, etc. on initiation of wrinkle in earlier phase of buckling are analysed.