Finite Element Analyses on the Soft Projectile Impact Testing of a Wall-floor-wall Reinforced Concrete Structure

Numerical simulation method is one of the important methods to study a commercial airplane crash into the nuclear power plant (NPP) shell structure at present. In order to validate the response of the NPP structure under the impact loading, the soft impact testing of a wall-floor-wall reinforced concrete structure were simulated by the commercial finite element software LS-DYNA in this paper. The material models of the projectile and the reinforced concrete structure are given. The finite element (FE) analyses on the soft impact testing are described. Compared the calculation result of the projectile deformation behavior with the tests, including the lengths of damaged and remained sections, we found that the parameter FS in the material model of MAT_ PLASTIC_KINEMATIC is quite important to the remaining length of the projectile after impact, especially the failure form of the soft projectile. Considering the fewer parameter input, the material model of MAT_CSCM_Concrete is selected in this paper. In general, the global results of the simulation (including the duration of impact process, the global vibration change trend of the accelerations at some position) are in agreement with the tests. Comparing the simulation results with the tests, the analyses results show that with this FE model it is possible to predict the soft projectile and the structure's failure process. However, achieving good agreement in the global dynamic response in series of displacements, the accelerations, and the reinforcement strains remains further study.