Numerical modeling of crack growth under dynamic loading conditions

摘要

A framework for modeling crack growth is de- scribed that is based on introducing on or more cohesive surfaces into a continuum. Constitutive relations are specified independently for the material and for the co- hesive surfaces. Fracture emerges as a natural outcome of the deformation process, without introducing an addi- tional failure criterion. The characterization of the me- chanical response of a cohesive surface involves both an interfacial strength and the work of separation per unit area, which introduces a characteristic length into the formulation. Finite element analyses are carried out for a plane strain block with an initial central crack, subject to impact loading.