Conversion criterion and time step control are corrected for smoothed particle hydrodynamics-finite element method (SPH-FEM) conversion algorithm. Impact of a 7.62 mm rifle bullet against a special heat treated 30CrMnSiA steel target plate is simulated in full-size in 3D using the corrected SPH-FEM conversion algorithm, in which distorted finite elements of the bullet are converted into SPH particles. An elastic-plasticity model is used for bullet, and corrected Johnson-Cook and Gruneisen EOS are used for target. Two destroyed modes of disc-shape plastic deformation and plugging perforation are calculated for different initial velocities of bullet. Good agreement between numerical results and experimental observations shows that the corrected SPH-FEM conversion algorithm could use finite elements and SPH particles efficiently, which provides an effective tool for simulation of a soft core bullet impacting on a hard plate.

A cohesive zone model is employed in finite element formulation using nonlinear explicit dynamic algorithm.A 4-node tetrahedron element and a 6-node triangular prism element are chosen as volumetric and cohesive stress/displacement element,respectively.A bilinear constitutive equation is used to describe cohesive tractions and displacement jumps.Interfacial penetration of adjacent layers after complete rupture is avoided.A damage criterion is formulated in displacement jump space.The final displacement jump is calculated with Benzeggagh-Kenane's propagation criterion.The onset displacement jump is calculated with Turon's initial damage surface criterion.The code(CVFEM) can simulate material interface delamination under mixed-mode ratio loading in 3D.Three examples are shown.Numerical predictions are compared with those obtained by Abaqus 6.7.