Modelling & Simulation
Multiscale FE-FFT- and phase-field-based computational modeling of microstructure evolution and structural material behaviour
Julian Kochmann, Institute of Applied Mechanics/RWTH Aachen University, Aachen, GermanyStephan Wulfinghoff, Institute of Applied Mechanics/RWTH Aachen University, Aachen, GermanyBob Svendsen, Chair of Material Mechanics/RWTH Aachen University, Aachen, GermanyStefanie Reese, Institute of Applied Mechanics/RWTH Aachen University, Aachen, Germany
The purpose of this work is the development of a two-scale, FE-FFT- and phase-field-based computational model to link macroscopic deformation processes to microstructural modifications and peripheral and surface zone properties of polycrystalline materials.
The macroscopic BVP is solved using finite element (FE) methods and the solution of the microscopic BVP, which is embedded as a representative volume element (RVE) in each integration point, is found exploiting fast Fourier transform (FFT), fixed-point and conjugate gradient (CG) methods. Non-conserved phase-fields are introduced to characterize the local material composition and model changes in the crystal structure. As a first example, the proposed methodology is applied to the modeling of martensitic phase transformations subjected to macroscopic deformation processes.