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Vol.11, No2, 2011, pp.115-122 |
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TWO-PARAMETER FRACTURE CRITERION BY VOLUMETRIC METHOD APPROACH Mohamed Hadj Meliani 1,2, Zitouni Azari 2, Guy Pluvinage 2, Yuri G. Matvienko 3 1) LPTPM, FSSI, Hassiba Ben Bouali University of Chlef, Esalem City, Chlef, Algeria, hadjmeliani@univ-metz.fr 2) Laboratoire de Mécanique, Biomécanique, Polymères, Structures, LaBPS-ENIM, Université Paul Verlaine de Metz, France 3) Laboratory of Modelling Damage and Fracture, Mechanical Engineering Research Institute of the Russian Academy of Sciences, Moscow, Russia |
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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 Kr,c which represents fracture toughness of a material with a notch of radius r, and the non-vanishing parameter from the Williams equation, A3 term. The effective A3-term A3eff has been estimated as the average value of the A3 term distribution in the region ahead of the notch tip at the effective distance Xef. These parameters are derived from the volumetric method of notch fracture mechanics. The material failure curve or master curve Kr,c = f(A3eff,c) is established as a result of notched specimen tests. It is shown that the notch fracture toughness is a linear decreasing function of the A3eff,c-stress. The use of the material failure curve to predict fracture conditions is demonstrated on gas pipes with the longitudinal surface notch. Keywords: notch stress intensity factor, effective distance, master curve, volumetric method |
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