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Modelling the propagation and bifurcation of plasticity induced cracks in Nickel base single crystal superalloys

Abstract : The main goal of this dissertation was to develop a model to simulate the processes of crack bifurcation and crack branching in anisotropic materials. To achieve this goal, a thorough coupling of crystal plasticity and regularised damage models was deemed necessary. Firstly, post-processing tools were developed to better analyse the results obtained from standard Crystal Plasticity simulations. These were then compared with experiments, thereby validating the use of Crystal Plasticity models for Nickel base single crystal superalloys. The validated Crystalplasticity model was then coupled with a regularised microdamage model such that the evolution of plasticity influenced damage and vice versa. The newly developed model allows for the simulation of cracks using the standard Finite Element Approach. Experiments studying crack propagation under different types of loads were simulated using the newly developed model, including CT, shear andcreep specimens. A methodology was also proposed for the identification of the newly introduced material parameters.
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https://pastel.archives-ouvertes.fr/pastel-00819218
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2012ENMP0074.pdf
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  • HAL Id : pastel-00819218, version 1

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Prajwal Sabnis. Modelling the propagation and bifurcation of plasticity induced cracks in Nickel base single crystal superalloys. Other. Ecole Nationale Supérieure des Mines de Paris, 2012. English. ⟨NNT : 2012ENMP0074⟩. ⟨pastel-00819218⟩

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