Crystal-plasticity-based FE modelling of a dual-phase microstructure in which grains have non-uniform shape and size
(2007)
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- Abstract
- Different modelling approaches are tested for the prediction of plastic heterogeneity of a dual-phase polycrystalline microstructure. A novel technique is proposed for the generation of finite element (FE) meshes offering a more realistic representation of the grain topology in 3D. The model microstructure consists of a primary phase with regular grain shapes, and a secondary phase, characterised by a smaller average grain size, located preferentially at the triple junctions. In order to reduce computational cost, the FE mesh is coarse within the grains and fine at the interfaces. A specifically designed coarsening procedure is used to ensure that the mesh remains periodic in 3D. Initial grain orientations are generated such that they constitute a statistically representative sampling of the global texture while accounting for the non-uniform grain size. Compared to other modelling strategies including the conventional Taylor model and FE modelling with grains shaped as bricks or as truncated octahedrons, the new method yields a more accurate prediction of the strain partitioning between the two phases and the macroscopic texture development in a multiphase steel.
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Citations
Melchior, M., Remacle, J.-F., & Delannay, L. (2007). Crystal-plasticity-based FE modelling of a dual-phase microstructure in which grains have non-uniform shape and size. AIP Conference Proceedings, 908(1), 381-386. https://doi.org/10.1063/1.2740841 (Original work published 2007)