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On the description of ductile fracture in metals by the strain localization theory

Abstract

Numerical simulations based on the bifurcation and imperfection versions of the strain localization theory are used in this paper to predict the failure loci of metals and applied to an advanced high strength steel subjected to proportional loading paths. The results are evaluated against the 3D unit cell analyses of Dunand and Mohr (J Mech Phys Solids 66(1):133–153, 2014. doi:10.1016/j.jmps.2014.01.008) available in the literature. The Gurson porous plasticity model (Gurson in J Eng Mater Technol 99(1):2–15, 1977. doi:10.1115/1.344340) is used to induce strain softening and drive the localization process. The effects of the void growth, void nucleation and void softening in shear are investigated over a large range of stress triaxialities and Lode parameters. A correlation between the imperfection and bifurcation results is established.

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Acknowledgements

O.S.H. and D.M. would like to acknowledge the financial support from the Centre for Advanced Structural Analysis (CASA) (Project No. 237885) as well as the FractAl project (Project No. 250553) funded by the Research Council of Norway and NTNU. Part of this work was performed when A.B. was a guest of the Structural Impact Laboratory at the Department of Structural Engineering at NTNU. A.B. also gratefully acknowledges the FractAl project for the financial support during his stay in Trondheim.

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Correspondence to David Morin.

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Morin, D., Hopperstad, O.S. & Benallal, A. On the description of ductile fracture in metals by the strain localization theory. Int J Fract 209, 27–51 (2018). https://doi.org/10.1007/s10704-017-0236-9

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  • DOI: https://doi.org/10.1007/s10704-017-0236-9

Keywords

  • Localization
  • Failure
  • Bifurcation
  • Loss of ellipticity
  • Porous materials