| タイトル | Multiscale Modeling of Intergranular Fracture in Aluminum: Constitutive Relation For Interface Debonding |
| 本文（外部サイト） | http://hdl.handle.net/2060/20080013632 |
| 著者（英） | Saether, E.; Glaessgen, E. H.; Yamakov, V. |
| 著者所属（英） | National Inst. of Aerospace |
| 発行日 | 2008-03-09 |
| 言語 | eng |
| 内容記述 | Intergranular fracture is a dominant mode of failure in ultrafine grained materials. In the present study, the atomistic mechanisms of grain-boundary debonding during intergranular fracture in aluminum are modeled using a coupled molecular dynamics finite element simulation. Using a statistical mechanics approach, a cohesive-zone law in the form of a traction-displacement constitutive relationship, characterizing the load transfer across the plane of a growing edge crack, is extracted from atomistic simulations and then recast in a form suitable for inclusion within a continuum finite element model. The cohesive-zone law derived by the presented technique is free of finite size effects and is statistically representative for describing the interfacial debonding of a grain boundary (GB) interface examined at atomic length scales. By incorporating the cohesive-zone law in cohesive-zone finite elements, the debonding of a GB interface can be simulated in a coupled continuum-atomistic model, in which a crack starts in the continuum environment, smoothly penetrates the continuum-atomistic interface, and continues its propagation in the atomistic environment. This study is a step towards relating atomistically derived decohesion laws to macroscopic predictions of fracture and constructing multiscale models for nanocrystalline and ultrafine grained materials. |
| NASA分類 | Composite Materials |
| 権利 | No Copyright |
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