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Prediction of instability in ductile senb fracture toughness specimens

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Abstract

An approximate flow stress model is proposed as a possible explanation of the variability observed for maximum load values of crack opening displacement (COD) and pseudo∼ J integral measurements in small specimens of fully ductile material. The model presented is limited to test pieces which exhibit ductile crack initiation after general yielding and more accurately describes low work hardening materials. However, the predictions of the dependency of such “toughness” parameters on specimen size are shown to be consistent with documented data.

Résumé

On propose un modèle approché d'écoulement de contraintes pour expliquer les variations observées pour la charge maximum lors de mesures du COD et de la pseudo-intégrale J dans des petites éprouvettes de matériau complètement ductile. Le modéle proposé est limité à des pièces d'essai qui présentent un amorçage de fissure ductile après plastification complète, et décrit plus précisément les matériaux dont l'écrouissage est faible. Cependant, on montre que la dépendance de ces paramètres de ténacité avec la dimension des éprouvettes peut être prédite en conformité avec les données expérimentales.

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  1. Risley Nuclear Power Development Laboratory, UKAEA, Risley, WA3 6AT, Warrington, England

    C. G. Chipperfield

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  1. C. G. Chipperfield
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Chipperfield, C.G. Prediction of instability in ductile senb fracture toughness specimens. Int J Fract 13, 847–860 (1977). https://doi.org/10.1007/BF00034327

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