Abstract
The near tip stress and porosity fields in a plane strain mode I crack under small scale yielding (s.s.y.) conditions have been studied using a constitutive model for porous elastic-plastic solids. These fields have been used in conjunction with criteria for fracture of tensile specimens to predict values of KIc for a mild steel over a range of temperatures. The regimes of dominance of fracture by slip-induced cleavage and void coalescence mechanisms have been determined. The predictions are shown to compare well with experimental data.
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