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.
Résumé
On a étudié les champs de porosités et des contraintes au voisinage de l'extrémité d'une fissure soumise à un état plan de déformation de Mode I et présentant des conditions de plastification à faible échelle, en faisant appel à un modèle constitutif pour les solides élasto-plastiques. Ces champs sont utilisés en combinaison avec les critères de rupture d'éprouvettes de traction, afin de prédire les valeurs de K Ic d'un acier doux dans une certaine gamme de température.
On détermine les conditions de prépondérance dans la rupture des mécanismes de coalescence des lacunes et de clivages entrainés par glissement. II se trouve que les prédictions concordent bien avec les résultats expérimentaux.
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Jagota, A., Hui, C.Y. & Dawson, P.R. The determination of fracture toughness for a porous elastic-plastic solid. Int J Fract 33, 111–124 (1987). https://doi.org/10.1007/BF00033743
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DOI: https://doi.org/10.1007/BF00033743