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An anisotropic Gurson type model to represent the ductile rupture of hydrided Zircaloy-4 sheets

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Abstract

The aim of this work is to model the ductile fracture of Zircaloy-4 sheets containing various amount of embrittling hydride precipitates. The proposed model is based on the Gurson–Tvergaard–Needleman model which is extended to take into account plastic anisotropy and viscoplasticity. The mechanical behavior is identified by conducting tensile tests and the damage nucleation rate (hydride cracking) is measured using quantitative metallography. The model is then used in a Finite Element software to represent crack propagation in Center Crack Panel specimens. Results are strongly mesh size dependent. The mesh size has to be identified by comparison with experimental results. Finally the model is validated by simulating crack initiation and growth in moderately complex structures (sheets containing holes).

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Authors and Affiliations

  1. Framatome, Nuclear Fuel, 10 rue J. Récamier, 69456 , Lyon Cedex 06, France

    M. Grange

  2. Ecole des Mines de Paris, Centre des Matériaux, UMR CNRS 7633, BP 87, 91003 , Evry Cedex, France

    J. Besson

  3. Ecole Nationale Supérieure de Chimie de Toulouse, 118 Route de Narbonne, 31077 , Toulouse, France

    E. Andrieu

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  1. M. Grange
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  2. J. Besson
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  3. E. Andrieu
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Grange, M., Besson, J. & Andrieu, E. An anisotropic Gurson type model to represent the ductile rupture of hydrided Zircaloy-4 sheets. International Journal of Fracture 105, 273–293 (2000). https://doi.org/10.1023/A:1007615513884

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