Finite element analysis of permanent indentation of solids due to low velocity impact

Sarath Abayaweera, University of Nevada, Las Vegas


A finite element model for the seventy five ton multi-barrier multi-purpose canister (MPC) Overpack is developed. This model is subjected to an impact loading that produces plastic stresses. The finite element software COSMOS/M 1.7 is used to study the nonlinear behavior of the canister overpack. A new mechanism for energy absorption is adopted to determine the permanent indentation. The results of the analysis for nodal displacements and stresses, along with the energy of impact, are used to evaluate the permanent indentation. COSMOS/M analysis yielded acceptable values for the permanent indentation for the impact of plane cylinders within a reasonable range of velocities. For the MPC Overpack, the FEM method produced values that appear reasonable, but there is no valid compariSon FEM method can be used as a guidance within limitation to ascertain the reuse of the MPC Overpack.