Abstract
A theoretical model relating fracture toughness expressed as J IC and bulge ductility {ie71-1} for a material exhibiting linear elastic behavior at low temperature and elastic-plastic behavior at higher temperatures is proposed. This model shows a variation of J IC with {ie71-2} for linear elastic behavior and J IC with {ie71-3} for elastic-plastic behavior. The model contains three constants to be determined experimentally for a given material, specimen geometry and testing conditions. A case study on 1045 steel in the temperature range −60 to 25°C confirms the validity of the model. The experimental results help in determining the size of the fracture zone ahead of the crack as well as the mechanisms for crack blunting and crack growth.
Résumé
On propose un modèle théorique reliant la ténacité à la rupture-exprimée par J IC-et la ductilité vis-à-vis du gonflement-exprimée par ∈f, α=1 β=0-pour un matériau à comportement linéaire élastique aux basses températures, et élasto-plastique aux températures élevées.
Le modèle montre que J IC est fonction de {ie79-4} pour le comportement élastique, et de ∈ pour le comportement élasto-plastique.
Trois constantes du modèle sont à déterminer expérimentalement, pour un matériau, une géométrie d'éprouvette, et des conditions d'essais donnés. Sa validité est confirmée par une étude de cas, portant sur un acier 1045 dans une gamme de températures comprise entre −60 et +25°C.
Les résultats expérimentaux contribuent à déterminer la taille de la zone de rupture en avant de la fissure, ainsi que le mécanisme d'arrondissement et de croissance de la fissure.
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Bayoumi, M.R., Bassim, M.N. Study of the relationship between fracture toughness (J IC) and bulge ductility. Int J Fract 23, 71–79 (1983). https://doi.org/10.1007/BF00020159
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DOI: https://doi.org/10.1007/BF00020159