Session Details
CS07: Crystal Mechanics
Friday, 13. October 2017; 08:30 - 10:30 Uhr in Raum 7.01
Sitzungsleitung: Richard Ostwald
08:30
Geometrically nonlinear single crystal viscoplasticity implemented into a hybrid discontinuous Galerkin framework
Atefeh Alipour (RWTH Aachen University), Stephan Wulfinghoff (RWTH Aachen University), Bob Svendsen (RWTH Aachen University), Stefanie Reese (RWTH Aachen University)
Kurzfassung:
The implementation of geometrically nonlinear crystal plasticity into a hybrid discontinuous Galerkin (DG) framework is presented using a regularization technique for very high strain rate sensitivity exponents. This combination leads to a numerically efficient and locking-free model. The performance of the regularized hybrid DG crystal plasticity is examined on a planar single crystal.
Geometrically nonlinear single crystal viscoplasticity implemented into a hybrid discontinuous Galerkin framework
Atefeh Alipour (RWTH Aachen University), Stephan Wulfinghoff (RWTH Aachen University), Bob Svendsen (RWTH Aachen University), Stefanie Reese (RWTH Aachen University)
Kurzfassung:
The implementation of geometrically nonlinear crystal plasticity into a hybrid discontinuous Galerkin (DG) framework is presented using a regularization technique for very high strain rate sensitivity exponents. This combination leads to a numerically efficient and locking-free model. The performance of the regularized hybrid DG crystal plasticity is examined on a planar single crystal.
08:50
Multiscale FE-FFT-based thermo-mechanically coupled modeling of viscoplastic polycrystalline materials
Sebastian Felder (RWTH Aachen University), Julian Kochmann (RWTH Aachen University), Stephan Wulfinghoff (RWTH Aachen University), Stefanie Reese (RWTH Aachen University)
Kurzfassung:
A two-scale, finite element (FE) and fast Fourier transform (FFT) based thermo-mechanically coupled material model formulation is proposed. The method is developed for the prediction of the structural material behavior and the corresponding local fields of viscoplastic polycrystalline materials. It allows for a qualitative investigation of the microscopic interplay between stress and temperature induced martensitic phase transformation and plasticity.
Multiscale FE-FFT-based thermo-mechanically coupled modeling of viscoplastic polycrystalline materials
Sebastian Felder (RWTH Aachen University), Julian Kochmann (RWTH Aachen University), Stephan Wulfinghoff (RWTH Aachen University), Stefanie Reese (RWTH Aachen University)
Kurzfassung:
A two-scale, finite element (FE) and fast Fourier transform (FFT) based thermo-mechanically coupled material model formulation is proposed. The method is developed for the prediction of the structural material behavior and the corresponding local fields of viscoplastic polycrystalline materials. It allows for a qualitative investigation of the microscopic interplay between stress and temperature induced martensitic phase transformation and plasticity.
09:10
Defect density-based modelling of work hardening and recovery in fully lamellar TiAl alloys
Jan Eike Schnabel (Helmholtz-Zentrum Geesthacht), Swantje Bargmann (University of Wuppertal)
Kurzfassung:
The dense arrangement of different microstructural interfaces in fully lamellar TiAl alloys necessitates microstructure informed modelling in order to predict the macroscopic mechanical behavior. Microtwinning within the lamellae leads to further interface related strengthening. The presented crystal plasticity model incorporates the evolution of dislocation density and afore mentioned twins during plastic deformation and accounts for thermally activated recovery of said defects.
Defect density-based modelling of work hardening and recovery in fully lamellar TiAl alloys
Jan Eike Schnabel (Helmholtz-Zentrum Geesthacht), Swantje Bargmann (University of Wuppertal)
Kurzfassung:
The dense arrangement of different microstructural interfaces in fully lamellar TiAl alloys necessitates microstructure informed modelling in order to predict the macroscopic mechanical behavior. Microtwinning within the lamellae leads to further interface related strengthening. The presented crystal plasticity model incorporates the evolution of dislocation density and afore mentioned twins during plastic deformation and accounts for thermally activated recovery of said defects.
09:30
Molecular dynamic study on the tensile deformation of an aluminium nano single- and polycrystal
Philipp Höfer (Bauhaus-University Weimar), Carsten Könke (Bauhaus-University Weimar)
Kurzfassung:
In our work, we focused on the understanding of the tensile deformation behaviour of a aluminium single- and polycrystal by using molecular dynamics simulations. We considered a fully 3D atomistic model with the embedded-atom method potential for aluminium. A symmetric tilt low energy grain boundary structure was generated and used as an initiation of fracture. Finally, we performed tensile tests investigated the results.
Molecular dynamic study on the tensile deformation of an aluminium nano single- and polycrystal
Philipp Höfer (Bauhaus-University Weimar), Carsten Könke (Bauhaus-University Weimar)
Kurzfassung:
In our work, we focused on the understanding of the tensile deformation behaviour of a aluminium single- and polycrystal by using molecular dynamics simulations. We considered a fully 3D atomistic model with the embedded-atom method potential for aluminium. A symmetric tilt low energy grain boundary structure was generated and used as an initiation of fracture. Finally, we performed tensile tests investigated the results.