Modelling delaminations using adaptive cohesive segments with rotations in dynamic explicit analysis

Multiple delamination planes can form when a composite structure is subjected to out-of-plane stresses during static over-loading or impact loading. Numerical modelling of such events often prohibitively expensive because large numbers cracks co-exist and interact, fracture models usually affect the time step size in explicit solutions. Here new method called Adaptive Mesh Segmentation proposed, which introduces segmentation ‘on-the-fly’ meshes quadratic finite elements with six degrees freedom per node, without any intervention from user reductions for solution stability. A novel cohesive formulation rotational introduced increases resolution numerical zone allows use relatively coarse meshes. Once critical stress criterion met, are added at element boundaries model strong discontinuities. moment–damage relationship proposed link discontinuity law translational by definition. initiating tractions moments minimal disturbances surrounding field also presented. Finally, applied analysis benchmarks using modest sizes. Considerable improvements accuracy observed compared conventional methods. • Modelling laminated composites adaptive segments. accurate analyses technique minimise errors associated initiation. loss continuity. Validation dynamics.