A two-scale three-dimensional approach for degradation and failure in polycrystallinematerials is presented. The method involves the component level and the grain scale. The damageinducedsoftening at the macroscale is modelled employing an initial stress boundary elementapproach. The microscopic degradation is explicitly modelled associating Representative VolumeElements (RVEs) to relevant points of the macro continuum and employing a cohesive-frictional 3Dgrain-boundary formulation to simulate intergranular degradation and failure in the Voronoimorphology. Macro-strains are downscaled as RVEs' periodic boundary conditions, while overallmacro-stresses are obtained upscaling the micro-stress field via volume averages. The comparisonbetween effective macro-stresses for the damaged and undamaged RVEs allows to define amacroscopic measure of local material degradation. Some attention is devoted to avoidingpathological damage localization at the macro-scale. The multiscale processing algorithm isdescribed and some preliminary results are illustrated.
|Titolo della pubblicazione ospite||Advances in Fracture and Damage Mechanics XIII|
|Numero di pagine||4|
|Stato di pubblicazione||Published - 2015|
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