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Two-parameter fracture criterion (K ρ,c -T ef,c) based on notch fracture mechanics

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Abstract

A two-parameter fracture criterion has been proposed to predict fracture conditions of notched components. This criterion includes the critical notch stress intensity factor K ρ,c, which represents fracture toughness of a material with a notch of radius ρ, and the effective T-stress. The effective T-stress T ef has been estimated as the average value of the T-stress distribution in the region ahead of the notch tip at the effective distance X ef . These parameters were derived from the volumetric method of notch fracture mechanics. The results of numerical T ef,c-stress estimation are compared to the T ef,c-stress results obtained from experimental analysis. The material failure curve or master curve K ρ,c = f(T ef,c) has been established as a result of the notched specimen tests. A large T ef,c range was covered from −0.80 σ Y to +0.19 σ Y using SENT, CT, RT (roman tile) and DCB specimens. It was shown that the notch fracture toughness is a linear decreasing function of the T ef,c-stress. The use of the material failure curve to predict fracture conditions was demonstrated on gas pipes with the surface notch.

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Authors and Affiliations

  1. LPTPM, FSSI, Hassiba BenBouali University of Chlef, Esalem City, Chlef, 02000, Algeria

    M. Hadj Meliani

  2. Laboratory of Modelling Damage and Fracture, Mechanical Engineering Research Institute of the Russian Academy of Sciences, 4M. Kharitonievsky Per., 101990, Moscow, Russia

    Y. G. Matvienko

  3. Laboratoire de Mécanique, Biomécanique, Polymères, Structures, LaBPS-ENIM, Université Paul Verlaine de Metz (UPVM), île de saulcy, 57045, Metz, France

    M. Hadj Meliani & G. Pluvinage

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  1. M. Hadj Meliani
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  2. Y. G. Matvienko
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  3. G. Pluvinage
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Correspondence to M. Hadj Meliani.

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Meliani, M.H., Matvienko, Y.G. & Pluvinage, G. Two-parameter fracture criterion (K ρ,c -T ef,c) based on notch fracture mechanics. Int J Fract 167, 173–182 (2011). https://doi.org/10.1007/s10704-010-9542-1

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  • DOI: https://doi.org/10.1007/s10704-010-9542-1

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