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• W2040357345 abstract "Prediction of maximum load bearing capacity and crack growth for ductile materials using existing models like J-R curve approach has the problem of transferability and the use of micro-mechanical model (e.g. Gurson Tvergaard, and Needleman [Tvergaard V, Needleman A. Analysis of cup cone fracture in a round tensile bar. Acta Metall 1984;32:157–169]) are limited by the requirements of the huge computation time and large numbers of critical metallurgical parameters as input to analysis. Marie and Chapuliot [Marie S, Chapuliot S. Ductile tearing simulation based on local energy criterion. Fatigue Fract Engng Mater Struct 1998;21:215–227] of CEA, France, proposed a simple but convenient ductile crack growth model using critical fracture energy (Gfr) for crack growth and Ji for initiation, both of which are material parameters. They also proposed several schemes, namely, graphical and slope of modified plastic J-integral vs crack growth, JM-pl − Δa methods for the evaluation of the value of Gfr from specimens as well as from components. In all these methods the role of non-crack displacement in the crack growth process was not considered. The necessary modifications due to non-crack displacement in the above methods to evaluate the values of Gfr was studied and published [Acharyya S, Dhar S, Chattopadhyay J. (2003). The effect of non-crack component on Critical fracture energy on ductile material. Int J Pressure Vessels Piping 2004;81:345–353] by the authors earlier. In this paper, the modified methods and formulation have been applied to evaluate the values of Gfr from experimental and FE simulated results for compact tensile (CT), three point bend (TPB) specimens and also from components like pipes and elbows. Then statistical estimation is done from these Gfr values to assess whether Gfr can be accepted as constant value material parameter. Finally, the mean value of Gfr obtained from statistical computation is used as material constant along with crack initiation toughness parameter (Ji)SZW to consider crack growth for FE simulation of load vs load-line–displacement (LLD) and load vs crack growth curves for different specimens and components. Finite element simulated results are compared with the experimental results and good matching between the two for several components are found and maximum error in prediction of maximum load is found to be within 12%." @default.
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• W2040357345 date "2008-01-01" @default.
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• W2040357345 title "Evaluation of critical fracture energy parameter Gfr and assessment of its transferrability" @default.
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• W2040357345 doi "https://doi.org/10.1016/j.engfracmech.2007.03.032" @default.
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