Plastic Relaxation at Crack Tip: Micromechanical Analysis

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  • Loyola de Oliveira Maria Angela
    Universidade Federal do Espírito Santo, Centro Tecnológico, Depto. Engenharia Mecânica, Av. Fernando Ferrari s/n, Goiabeiras, Vitória (ES)
  • Rangel Angelo Gil Pezzino
    Universidade Federal do Espírito Santo, Centro Tecnológico, Depto. Engenharia Mecânica, Av. Fernando Ferrari s/n, Goiabeiras, Vitória (ES)
  • Michot Gerard
    INPL, École des Mines, Laboratoire de Métallurgie Physique et Sciences des Matériaux

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The influence of a plastic zone developed at a crack tip is analyzed under a micromechanical point of view. Mechanical interaction is described in terms of crack shielding caused by the stress intensity factor induced by a dislocation loop in the three opening modes. Numerical calculations and experimentally studied configurations quantify the total relaxation rate induced by this dislocation loop.

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