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International Journal for Multiscale Computational Engineering

Publicado 6 números por año

ISSN Imprimir: 1543-1649

ISSN En Línea: 1940-4352

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COUPLED COHESIVE ZONE REPRESENTATIONS FROM 3D QUASICONTINUUM SIMULATION ON BRITTLE GRAIN BOUNDARIES

Volumen 9, Edición 4, 2011, pp. 481-501
DOI: 10.1615/IntJMultCompEng.v9.i4.90
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SINOPSIS

This paper contributes to a hierarchical multiscale concept for the simulation of brittle intergranular fracture in polycrystalline materials, for example, aluminum. Intended is the numerical investigation of physical fracture phenomena on an atomistic microscale and the integration of resulting parameters into damage models on the engineering continuum scale. A procedure for computational intergranular fracture analysis on the atomistic scale is presented, and the transition to coupled cohesive zone representations of continuum models is explained. The brittle intergranular fracture process on the atomistic scale is investigated in three dimensions, applying a parallelized nonlocal quasicontinuum method, which was implemented for the robust and efficient analysis of grain boundary fracture in polycrystalline metals with arbitrary misorientation. The nonlocal quasicontinuum method fully describes the material behavior by atomistic potential functions but reduces the number of atomic degrees of freedom by introducing kinematic couplings in regions of a smooth deformation field. Interface separation laws are obtained from tensile and shear simulations on the atomistic scale, and extracted cohesive parameters are used for parameterization of traction separation laws, which are part of coupled cohesive zone models, to simulate the brittle interface decohesion in heterogeneous polycrystal structures.

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CITADO POR
  1. Galvis Andres F., Santos-Flórez Pedro A., Sollero Paulo, de Koning Maurice, Wrobel Luiz C., Multiscale model of the role of grain boundary structures in the dynamic intergranular failure of polycrystal aggregates, Computer Methods in Applied Mechanics and Engineering, 362, 2020. Crossref

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