Dynamics of local deformation and fracture of a metal plate

The article considers the task solution of high-velocity impact interworking of indenter and plate in the LS-DYNA package. Application of two types of finite elements - formulations of Lagrange and Euler to one object (hybrid formulation) is offered. It allows minimizing the mass defect and obtaining experimentally observed fracture mechanisms. Out from independent experiments the parameters of the plate material model at deformation velosities close to ones at a bullet impact are identified. Results of calculation of velocity after breakthrough and mass of wreckage according to the developed technique agree well with the experimental data of breakthrough of the plate with the bullets 7H10 of assault rifle AK-74.