Abstract
The purpose of this work is the prediction of micromechanical fields and the overall material behavior of heterogeneous materials using an efficient and robust two-scale FE-FFT-based computational approach. The macroscopic boundary value problem is solved using the finite element (FE) method. The constitutively dependent quantities such as the stress tensor are determined by the solution of the local boundary value problem. The latter is represented by a periodic unit cell attached to each macroscopic integration point. The local algorithmic formulation is based on fast Fourier transforms (FFT), fixed-point and Newton-Krylov subspace methods (e.g. conjugate gradients). The handshake between both scales is defined through the Hill-Mandel condition. In order to ensure accurate results for the local fields as well as feasible overall computation times, an efficient solution strategy for two-scale full-field simulations is employed. As an example, the local and effective mechanical behavior of ferrit-perlit annealed elasto-viscoplastic 42CrMo4 steel is studied for three-point-bending tests. For simplicity, attention is restricted to the geometrically linear case and quasi-static processes.
The original version of this chapter was revised: Author provided figure corrections have been incorporated. The erratum to this chapter is available at https://doi.org/10.1007/978-3-319-65463-8_19
Notes
- 1.
Note that the identity \(\varvec{\varepsilon }^{(i)}=\varvec{\varepsilon }_{\mathrm {M}}+\hat{\varvec{\Gamma }}^{(0)}*[\mathbb {C}^{(0)}\varvec{\varepsilon }^{(i)}]\) was used to arrive at (24), where \(\mathbf {f}*\mathbf {g}=\int _{-\infty }^{\infty }\mathbf {f}(\varvec{\xi })\,\mathbf {g}(\mathbf {x}-\varvec{\xi })\,d\varvec{\xi }\) denotes the convolution integral of two arbitrary fields \(\mathbf {f}\) and \(\mathbf {g}\).
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Financial support of Subprojects M03 and C02 of the Transregional Collaborative Research Center SFB/TRR 136 by the German Science Foundation (DFG) is gratefully acknowledged.
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Kochmann, J., Ehle, L., Wulfinghoff, S., Mayer, J., Svendsen, B., Reese, S. (2018). Efficient Multiscale FE-FFT-Based Modeling and Simulation of Macroscopic Deformation Processes with Non-linear Heterogeneous Microstructures. In: Sorić, J., Wriggers, P., Allix, O. (eds) Multiscale Modeling of Heterogeneous Structures. Lecture Notes in Applied and Computational Mechanics, vol 86. Springer, Cham. https://doi.org/10.1007/978-3-319-65463-8_7
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