Abstract
The temperature dependence of ductility, strength and fracture toughness for a BCC material undergoing predominantly linear elastic behavior at low temperatures and elastic-plastic behavior at higher temperatures is examined. A model, based on ductile fracture mechanisms involving void nucleation followed by cavity growth and void coalescence, is developed to relate the fracture toughness parameter J IC with temperature. Two general equations for linear elastic and elastic plastic regimes of J IC versus temperature T, are obtained. Applications of this model to experimental data obtained on a carbon steel show that J IC varies with T 2 at low temperatures and with T at higher temperatures, thus defining a transition temperature.
Résumé
On examine la dépendance qu'exerce la température sur la ductilité, la résistance et la ténacité à la rupture d'un matériau cubique centré qui fait montre d'un comportement linéaire élastique à basse température et d'un comportement élasto-plastique à haute température.
On développe un modèle destiné à mettre en relation le paramètre de ténacité à la rupture J IC avec la température. Ce modèle est basé sur les mécanismes de rupture ductile comportant la formation de lacunes, suivie de leur croissance et de leur coalescence.
Deux équations générales, relatives aux régimes élastiques linéaires et élasto-plastique, sont obtenues pour relier J IC à température T.
En appliquant ce modèle à des données expérimentales obtenues sur un acier au carbone, on montre que J IC varie avec T 2 à basse température et avec T à plus haute température, ce qui détermine une température de transition.
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Bayoumi, M.R., Bassim, M.N. Temperature dependence of fracture toughness J IC and ductility for BCC materials in the transition region. Int J Fract 23, 259–269 (1983). https://doi.org/10.1007/BF00020694
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DOI: https://doi.org/10.1007/BF00020694