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Finite element simulation of fracture behaviour for aged duplex stainless steels

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Abstract

In this paper, the local approach model developed by Gurson–Tvergaard has been applied to simulate both the crack initiation and the crack growth of aged duplex stainless steel. The parameters of the Gurson–Tvergaard model have been obtained, from axisymmetric notched specimen testing, as a function of the ageing time at 400°C, the ferrite content of the steel and the stress triaxiality. After that, to simulate the fracture of CT specimens, finite element (FE) calculations have been effected in order to obtain the stress triaxiality value at each point on the process zone ahead of the crack tip of these specimens. The adequate damage parameters concerning triaxiality are determined from the ones obtained at the notched specimens, in order to be used in FE simulations of fracture behaviour. With them, the corresponding J−Δa curves have been simulated as representative of both the crack initiation and crack propagation stages, and compared with experimental results in order to validate the methodology proposed.

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Authors and Affiliations

  1. Division of Mechanics of Continuum Media, University of Burgos, Spain

    J. M. Alegre

  2. Laboratory of Materials Science and Engineering, University of Cantabria, Spain

    F. Gutiérrez-Solana

Authors
  1. J. M. Alegre
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  2. F. Gutiérrez-Solana
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Correspondence to J. M. Alegre.

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Alegre, J.M., Gutiérrez-Solana, F. Finite element simulation of fracture behaviour for aged duplex stainless steels. Int J Fract 134, 23–39 (2005). https://doi.org/10.1007/s10704-005-7150-2

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  • DOI: https://doi.org/10.1007/s10704-005-7150-2

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