A new three-dimensional grain-level formulation for intergranular degradation and failure in polycrystalline materials is presented. The polycrystalline microstructure is represented as a Voronoi tessellation and the boundary element method is used to express the elastic problem for each crystal of the aggregate. The continuity of the aggregate is enforced through suitable conditions at the intergranular interfaces. The grain-boundary model takes into account the onset and evolution of damage by means of an irreversible linear cohesive law, able to address mixed-mode failure conditions. Upon interface failure, a non-linear frictional contact analysis is introduced for addressing the contact between micro-crack surfaces. An incremental-iterative algorithm is used for tracking the micro-degradation and cracking evolution. The behavior of a polycrystalline specimen under tensile load has been performed, to show the capability of the formulation.

Benedetti, I., liabadi, M.H. (2013). A cohesive boundary element approach to material degradation in three-dimensional polycrystalline aggregates. In Advances in Boundary Element and Meshless Techniques.

A cohesive boundary element approach to material degradation in three-dimensional polycrystalline aggregates

BENEDETTI, Ivano;
2013-01-01

Abstract

A new three-dimensional grain-level formulation for intergranular degradation and failure in polycrystalline materials is presented. The polycrystalline microstructure is represented as a Voronoi tessellation and the boundary element method is used to express the elastic problem for each crystal of the aggregate. The continuity of the aggregate is enforced through suitable conditions at the intergranular interfaces. The grain-boundary model takes into account the onset and evolution of damage by means of an irreversible linear cohesive law, able to address mixed-mode failure conditions. Upon interface failure, a non-linear frictional contact analysis is introduced for addressing the contact between micro-crack surfaces. An incremental-iterative algorithm is used for tracking the micro-degradation and cracking evolution. The behavior of a polycrystalline specimen under tensile load has been performed, to show the capability of the formulation.
lug-2013
International Conference on Boundary Element and Meshless Techniques
Paris, France
July 16-18, 2013
XIV
2013
6
Benedetti, I., liabadi, M.H. (2013). A cohesive boundary element approach to material degradation in three-dimensional polycrystalline aggregates. In Advances in Boundary Element and Meshless Techniques.
Proceedings (atti dei congressi)
Benedetti, I; liabadi, MH
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/100125
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