The Study On An Energy-absorbing And Buffering Of The Layer-combined Cylindrical Shell And Simulation

The study on an energy-absorbing and buffering of the layer-combined cylindrical shellaims to describe systematically and exactly the process of absorbing energy, the ratio of theenergy absorption and the characteristic of the buffering force. It is helpful to the reliabledesign of the modern protective works and the solution to important problems of works,which usually involves large deformation, non-linearity, instantaneous loading, coupling andcomplicated constraints. In this paper the one-layer cylindrical shell is simulated with the limited elementprogram 'LS-DYNA' on the base of the theories and the related experiments, which isinvented or completed by the predecessors, the simulated results are correspondence to thetheories and experiments. By analyzing the simulated result about the layer-combinedcylindrical shells and comparing to the one-layer cylindrical shells, it is found that thecapability of the energy-absorbing and buffering of the layer-combined cylindrical shell ismore powerful than one-layer's.By analyzing the simulated numerical value results and the process of the response tovaried loads, the cylindrical shell bucking form is related with the material property : the idealelastic-plastic material will be simulated into axisymmetrical bucking which result is identicalto the theories, while the non-ideal elastic-plastic material will be simulated intononaxisymmetrical bucking which result is more than the theories because thestrain-strengthening effect is ignored in the theoretical ones.By analyzing to the simulation of the layer-combined cylindrical shells, it is obtainedthat the layer-combined cylindrical shell's ability of the energy-absorbing and buffering is 12percent bigger than the one-layer shell's under the condition of the nonaxisymmetricalbucking , and it's buffering force curve is flatter than one-layer's, but under the condition ofthe axisymmetrical bucking the ability of the two kind of cylindrical shells is same. Under theradial loading, the ability of the energy-absorbing and buffering varies with the radius of theinside shell, and the capability of the energy-absorbing changes in the same indirection withthe radius, while the capability of the buffering inverses.