Microdamage modelling of crack initiation and propagation in FCC single crystals under complex loading conditions

Prajwal A. Sabnis 1 Samuel Forest 1 Jonathan Cormier 2
1 MAT - Centre des Matériaux
2 PPRIME - Institut Pprime
Abstract : A regularised anisotropic continuum damage mechanics model is presented that couples crystal plasticity with damage induced on crystallographic planes. Two and three-dimensional finite element simulations of crack initiation and propagation in single crystal specimens under complex multiaxial loading with dominating shear are presented for the first time. The crack path in a four-point double notched shear specimen is predicted, in accordance with experimental testing of single crystal nickel-based superalloy AM1. The initiation, bifurcation and propagation of a crack in a shifted double notched specimen under creep conditions is then simulated and compared to the experimental response of nickel-based superalloy MC2 at high temperature. The attention is focused on the influence of coupling between viscoplasticity and damage on the crack path in these single crystals.
Keywords : Continuum damage mechanics Micromorphic media Crystal plasticity Crack initiation Crack propagation Nickel-based superalloy
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Article dans une revue
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01424994
Contributeur : Bibliothèque Umr7633 <>
Soumis le : mardi 3 janvier 2017 - 11:12:40
Dernière modification le : mardi 4 juin 2019 - 18:21:36

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ENSMP | PARISTECH | ENSMP_MAT | INSTITUT-TELECOM | PSL | UNIV-POITIERS | PPRIME

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Prajwal A. Sabnis, Samuel Forest, Jonathan Cormier. Microdamage modelling of crack initiation and propagation in FCC single crystals under complex loading conditions. Computer Methods in Applied Mechanics and Engineering, Elsevier, 2016, 312, pp.468-491. ⟨10.1016/j.cma.2016.04.018⟩. ⟨hal-01424994⟩

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