Session Details
MS13-2: Multiscale Methods for Complex Materials (Ganzes Minisymposium anzeigen)
Wednesday, 11. October 2017; 16:00 - 18:00 Uhr in Raum 7.31
Sitzungsleitung: Bernhard Eidel
16:00
Stress simulation in lithium-ion batteries
Tobias Hofmann (Fraunhofer Institute for Industrial Mathematics ITWM), Heiko Andrä (Fraunhofer Institute for Industrial Mathematics ITWM), Ralf Müller (University of Kaiserslautern), Jochen Zausch (Fraunhofer Institute for Industrial Mathematics ITWM)
Kurzfassung:
Phase separation during the intercalation of lithium ions can lead to degradation effects in some cathode materials. A model describing lithium ion diffusion, electric potentials and small deformations is introduced on the microscale. The Cahn-Hilliard equation is used in an electrochemical model. coupled to linear elasticity of small strains in the electrode material. An immersed boundary method is used with adapative time steps. Charging of porous microstructures is numerically simulated.
Stress simulation in lithium-ion batteries
Tobias Hofmann (Fraunhofer Institute for Industrial Mathematics ITWM), Heiko Andrä (Fraunhofer Institute for Industrial Mathematics ITWM), Ralf Müller (University of Kaiserslautern), Jochen Zausch (Fraunhofer Institute for Industrial Mathematics ITWM)
Kurzfassung:
Phase separation during the intercalation of lithium ions can lead to degradation effects in some cathode materials. A model describing lithium ion diffusion, electric potentials and small deformations is introduced on the microscale. The Cahn-Hilliard equation is used in an electrochemical model. coupled to linear elasticity of small strains in the electrode material. An immersed boundary method is used with adapative time steps. Charging of porous microstructures is numerically simulated.
16:20
Cycle-by-cycle fatigue damage model for concrete
Thomas Titscher (Federal Institute for Materials Research and Testing), Jörg F. Unger (Federal Institute for Materials Research and Testing), Javier Oliver (Universitat Politècnica de Catalunya (UPC))
Kurzfassung:
Damage caused by stress concentrations in the complex mesoscopic geometry of concrete leads to continuous stress redistribution over the material's life time. The presented fatigue damage model captures this by resolving each load cycle in a cycle-by-cycle time integration. The model extends a static damage model to failure caused by the (time dependent) strain amplitudes and, thus, allows calibrating the majority of the material's parameters in static experiments.
Cycle-by-cycle fatigue damage model for concrete
Thomas Titscher (Federal Institute for Materials Research and Testing), Jörg F. Unger (Federal Institute for Materials Research and Testing), Javier Oliver (Universitat Politècnica de Catalunya (UPC))
Kurzfassung:
Damage caused by stress concentrations in the complex mesoscopic geometry of concrete leads to continuous stress redistribution over the material's life time. The presented fatigue damage model captures this by resolving each load cycle in a cycle-by-cycle time integration. The model extends a static damage model to failure caused by the (time dependent) strain amplitudes and, thus, allows calibrating the majority of the material's parameters in static experiments.
16:40
Domain decomposition methods for fracture mechanics problems and its application to fiber reinforced concrete
Philip Huschke (Federal Institute for Materials Research and Testing), Jörg F. Unger (Federal Institute for Materials Research and Testing)
Kurzfassung:
A finite element tearing and interconnecting (FETI) approach for phase-field models and gradient enhanced damage models is presented. These diffusive crack models can solve fracture mechanics problems by integrating a set of partial differential equations and thus avoid the explicit treatment of discontinuities. However, they require a fine discretization in the vicinity of the crack. FETI methods distribute the computational cost among multiple processors and thus speed up the computation.
Domain decomposition methods for fracture mechanics problems and its application to fiber reinforced concrete
Philip Huschke (Federal Institute for Materials Research and Testing), Jörg F. Unger (Federal Institute for Materials Research and Testing)
Kurzfassung:
A finite element tearing and interconnecting (FETI) approach for phase-field models and gradient enhanced damage models is presented. These diffusive crack models can solve fracture mechanics problems by integrating a set of partial differential equations and thus avoid the explicit treatment of discontinuities. However, they require a fine discretization in the vicinity of the crack. FETI methods distribute the computational cost among multiple processors and thus speed up the computation.
CANCELLED Macroscopic yield curves based on RVE-based polycrystal simulations
Lisa Scheunemann (University of Duisburg-Essen), Jörg Schröder (University of Duisburg-Essen)
Lisa Scheunemann (University of Duisburg-Essen), Jörg Schröder (University of Duisburg-Essen)