Dynamic fracture via molecular dynamics and cohesive finite element method

Abstract

Dynamic fracture is investigated using molecular dynamics and cohesive finite element approaches. The molecular dynamics technique is based on the motion of a given number of atoms governed by their mutual interatomic interactions that are described by interatomic potentials. Using million atom systems, many recent laboratory findings occur in our simulation experiments. With every atomistic degree of freedom being accounted for, microscopic processes are identified. The continuum formulation involves specifying a set of cohesive surfaces. Each cohesive surface is described by a traction-displacement relation that allows for the creation of new free surface. The solid under consideration has inhomogeneities randomly distributed. Results for crack growth and branching are in accord with experimental observations. Some discussion on coupling continuum finite element and molecular dynamics is also presented.