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Cell model for nonlinear fracture analysis – I. Micromechanics calibration

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Abstract

A computational approach based on a cell model of material offers real promise as a predictive tool for nonlinear fracture analysis. A key feature of the computational model is the modeling of the material in front of the crack by a layer of similarly-sized cubic cells. Each cell of size D contains a spherical void of initial volume fraction f 0. The microseparation characteristics of the material in a cell, a result of void growth and coalescence, is described by the Gurson–Tvergaard constitutive relation; the material outside the layer of cells can be modelled as an elastic- plastic continuum. The success of this computational model hinges on developing a robust calibration scheme of the model parameters. Such a scheme is proposed in this study. The material-specific parameters are calibrated by a two-step micromechanics/fracture-process scheme. This article describes the micromechanics calibration of void growth taking into account both the strain hardening and the strength of the material. The fracture-process calibration is addressed in a companion paper.

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Authors and Affiliations

  1. Division of Engineering, Brown University, Providence, RI, 02912, U.S.A

    Jonas Faleskog & C. Fong Shih

  2. Presently at Department of Solid Mechanics, Royal Institute of Technology, S-10044, Stockholm, Sweden

    Xiaosheng Gao

Authors
  1. Jonas Faleskog
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  2. Xiaosheng Gao
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  3. C. Fong Shih
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Faleskog, J., Gao, X. & Shih, C.F. Cell model for nonlinear fracture analysis – I. Micromechanics calibration. International Journal of Fracture 89, 355–373 (1998). https://doi.org/10.1023/A:1007421420901

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  • DOI: https://doi.org/10.1023/A:1007421420901

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