The near crack tip porosity fields in different fracture specimens, single edge notched, single edge notched loaded in centre of ligament, three point bending specimens, and small scale yielding (SSY) mode have been studied by the finite deformation finite element method. The presence and subsequent growth of smaller-scale voids were taken into account by using Gurson’s model to describe the constitutive behaviour of the material. Based on damage equivalence at a characteristic position in the SSY mode and actual fracture specimens, the ratio of scaling parameters, J values, in both modes was obtained, and was used to eliminate the geometry dependence of fracture toughness through correlations to the small scale yielding mode.