关键词: 界面断裂, 粘结单元, 显式动力学算法

Abstract: 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.

Key words: delamination, cohesive element, explicit dynamic method