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A multiscale model for nickel-based directionally solidified materials
International Journal of Plasticity ( IF 6.490 ) Pub Date : 2018-10-16 , DOI: 10.1016/j.ijplas.2018.10.003
F. Coudon, G. Cailletaud, J. Cormier, L. Marcin

In this paper, the so-called “β rule” is used to simulate the anisotropic behaviour of directionally solidified superalloys. First, the “mean-field” model is extended to the general case of heterogeneous local elasticity. Two other models also designed using the “self-consistent” framework are applied to make comparisons, either with the assumption of a purely elastic accommodation of grains (Kröner-Weng model) or the translated field theory. As a reference, full-field simulations using a representative volume element (RVE) and a crystal plasticity finite element model (CPFEM) are carried out. Results show that the β rule is able to predict the overall response of the material for various cases such as one-dimensional or two-dimensional cyclic loading with or without a mean stress. Otherwise, local estimations are studied for both mean-field and full-field models. The local responses of the β rule are consistent when they are compared to those of CPFE simulations.

更新日期:2018-10-16

 

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