Numerical simulation the bottom structures grounding test by LS-DYNA

Nonlinear finite element method (FEM) is a powerful tool for analyzing ship collision and grounding problems. The reliability of the numerical simulation results largely depends on the proper definition of problem and careful control of some critical parameters. The purpose of the paper is to study the effect of selected parameters on crashworthiness of the single-hull bottom structure due to raking. The quasi-static grounding process is simulated by the LS-DYNA code. The effects of the following parameters are considered: the boundary condition, the friction coefficient, shell element type, the residual stress and the material model. The influences of selected parameters are assessed by comparing the different results in the impact force and absorbed energy vs. penetration of rock model. Some suggestions are proposed for numerical simulation in finite element code LS-DYNA.