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Crack Path Predictions in Ni-based Superalloy Plates UsingCoupled Nonlocal Damage-Plasticity
Last modified: 2013-03-15
Abstract
The present paper introduces a new nonlocal coupled damage-plasticitymodel aiming at predicting crack paths within plates made of ductile material andsubjected to pure tensile loading. This model is inspired by Nguyen’s model [1] forquasi-brittle material. It uses the Houlsby and Puzrin [2] framework that makes themodel formulation internally consistent by linking the damage and the yield functionsvia a dissipation potential. However, as in Lemaitre [3], the damage law is explicitlydefined in order to ease the implementation. This model has been implemented within aUMAT for the finite element (FE) package Abaqus (implicit). Thin plates of differentgeometries have been modelled and tested using this model. The model ability to followthe process until total failure without encountering problems such as numericalinstabilities, to give mesh-independent results and to predict reasonable crack paths hasbeen demonstrated. Advantages and limitations of the present approach are discussed.Emphasis is placed on the need to calibrate the model parameters so as to achieve thebest match with the experimental data.
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