On the Influence of Microstructure on Failure Initiation in the Framework of Crystal Plasticity and a FFT-Based Spectral Solver
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2018-07-03
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Conference Paper
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Abstract
Development of new materials as well as description of the hardening and failure behaviour of currently available materials is strongly supported by advanced material modelling techniques as well as appropriate numerical methods. A representative volume element (RVE)-based strategy for modeling the hardening and failure behavior of a ferritic–pearlitic steel and the AA6016-T4 aluminum alloy is presented. At first, pearlite properties were considered to be isotropic and homogeneous and crack initiation is modeled in the framework of XFEM. Boundary conditions of the RVE were defined based on the macroscopic deformation history in a region of interest. Pearlite cracking modeled at the mesoscale corresponds well to the observed cracks on SEM-micrographs. In a further approach, the spectral solver of DAMASK (Düsseldorf Advanced Material Simulation Kit, an open source crystal plasticity general purpose solver) was applied to model damage initiation at grain level. Investigations showed that orientations of cementite lamellae as well as the misorientation angle between ferrite grains have a significant influence on damage initiation and propagation. For the aluminum alloy, an isotropic ductile damage model was calibrated on tensile test data. A
parameter study including the influence of texture and loading conditions showed that damage is preferred to initiate inside the grain as well as on the grain boundaries with a big misorientation angle. The concept of coupling the FE-method to simulate the macroscopic behavior of the material and the FFT based spectral solver to achieve a high resolution of the microstructure in the framework of RVE computations leads to an efficient strategy regarding computational time and modeling of failure at different length scales.
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published
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11th Forming Technology Forum Zurich 2018, Experimental and numerical methods in the FEM based crack prediction, Proceedings
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73 - 78
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Institute of Virtual Manufacturing, ETH Zurich,
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Forming Technology Forum: Experimental and numerical methods in the FEM based crack prediction 2018
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Subject
crystal plasticity; damage; cementite; FFT; XFEM
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03685 - Hora, Pavel (emeritus) / Hora, Pavel (emeritus)
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