This paper addresses the derivation of a micromechanically motivated incremental mixed-mode traction separation law in the context of cohesive zone modeling of crack propagation in ductile metallic materials. The formulation is based on the growth of an array of pores idealized as cylinders which are considered as the representative volume elements. An upper bound solution is applied for the deformation of the representative volume element and different incremental traction-separation relations are obtained for mixed-mode loading conditions. While most of the current traction-separation relations used in cohesive zone modeling consider phenomenological relations, in the current work micromechanical parameters such as size, shape and spacing of pores describe the level of damage and linkage of the pores characterizes the propagating crack. Copyright (C) 2016 The Authors. Published by Elsevier B.V.