Session Details
MS18-3: Virtual Analysis and Design of New Materials (Ganzes Minisymposium anzeigen)
Thursday, 12. October 2017; 16:00 - 18:00 Uhr in Raum 7.31
Sitzungsleitung: Christian Weißenfels
16:00
Modeling three-dimensional anisotropic damage in organic sheet composites at large deformation
Dominik Naake (Robert Bosch GmbH), Fabian Welschinger (Robert Bosch GmbH), Luise Kärger (Karlsruhe Institute of Technology (KIT)), Frank Henning (Karlsruhe Institute of Technology (KIT))
Kurzfassung:
Organic sheets consist of embedded interwoven rovings in a thermoplastic matrix. Loading results in a finite change of local reinforcement orientations with reversible and irreversible contributions. A constitutive model taking into account the large strain kinematics and damage evolution is presented. Mechanism-based damage formulations in both the reinforcements and the matrix are employed. Numerical examples demonstrate the features of the suggested material model.
Modeling three-dimensional anisotropic damage in organic sheet composites at large deformation
Dominik Naake (Robert Bosch GmbH), Fabian Welschinger (Robert Bosch GmbH), Luise Kärger (Karlsruhe Institute of Technology (KIT)), Frank Henning (Karlsruhe Institute of Technology (KIT))
Kurzfassung:
Organic sheets consist of embedded interwoven rovings in a thermoplastic matrix. Loading results in a finite change of local reinforcement orientations with reversible and irreversible contributions. A constitutive model taking into account the large strain kinematics and damage evolution is presented. Mechanism-based damage formulations in both the reinforcements and the matrix are employed. Numerical examples demonstrate the features of the suggested material model.
16:20
Micromechanical Study of Fiber Kinking and Debonding in Fiber Reinforced Composites
Samira Hosseini (Leibniz Universität Hannover), Stefan Löhnert (Leibniz Universität Hannover)
Kurzfassung:
The objective of this work is to study the fiber kinking and subsequent fiber/matrix debonding in FRP composites under unidirectional compressive loading. In the micro-scale, geometrically nonlinear cohesive elements are used in order to model the shear failure of the matrix material at its interface with the fibers which results in initiation and evolution of local splitting between fiber and matrix and drives the rotation of fibers up to kink band formation.
Micromechanical Study of Fiber Kinking and Debonding in Fiber Reinforced Composites
Samira Hosseini (Leibniz Universität Hannover), Stefan Löhnert (Leibniz Universität Hannover)
Kurzfassung:
The objective of this work is to study the fiber kinking and subsequent fiber/matrix debonding in FRP composites under unidirectional compressive loading. In the micro-scale, geometrically nonlinear cohesive elements are used in order to model the shear failure of the matrix material at its interface with the fibers which results in initiation and evolution of local splitting between fiber and matrix and drives the rotation of fibers up to kink band formation.
16:40
A Non-Intrusive Global-Local Approach with Application to Phase-Field Modeling of Brittle Fracture
Nima Noii (Technical University of Braunschweig), Tymofiy Gerasimov (Technical University of Braunschweig), Laura De Lorenzis (Technical University of Braunschweig), Olivier Allix (ENS Paris-Saclay)
Kurzfassung:
The variational multiscale (VMS) method by Hughes et al. is a well-established framework for the analysis of nonlinear heterogeneous materials and is capable of tackling strain localization in the multiscale framework. In this contribution, we propose a non-intrusive setting of the VMS approach to be applied to the phase-field formulation of fracture. The proposed two-scale procedure yields results comparable to the single-scale solution, yet they are obtained with much superior efficiency.
A Non-Intrusive Global-Local Approach with Application to Phase-Field Modeling of Brittle Fracture
Nima Noii (Technical University of Braunschweig), Tymofiy Gerasimov (Technical University of Braunschweig), Laura De Lorenzis (Technical University of Braunschweig), Olivier Allix (ENS Paris-Saclay)
Kurzfassung:
The variational multiscale (VMS) method by Hughes et al. is a well-established framework for the analysis of nonlinear heterogeneous materials and is capable of tackling strain localization in the multiscale framework. In this contribution, we propose a non-intrusive setting of the VMS approach to be applied to the phase-field formulation of fracture. The proposed two-scale procedure yields results comparable to the single-scale solution, yet they are obtained with much superior efficiency.
17:00
Two-scale anisotropic damage modeling of SMC
Johannes Görthofer (Karlsruhe Institute of Technology (KIT)), Malte Schemmann (Karlsruhe Institute of Technology (KIT)), Thomas Böhlke (Karlsruhe Institute of Technology (KIT))
Kurzfassung:
We present a two-scale anisotropic damage model that captures matrix damage and fiber-matrix interface debonding. Based on the fiber orientation distribution and a Weibull probability distribution of the interface strength, the damage evolution on the microscale is determined. Within this work focus lies on the comparison of different matrix damage evolution models. To predict the macroscopic behavior, a mean field homogenization with the Mori-Tanaka method based on orientation tensors of second and fourth order is applied.
Two-scale anisotropic damage modeling of SMC
Johannes Görthofer (Karlsruhe Institute of Technology (KIT)), Malte Schemmann (Karlsruhe Institute of Technology (KIT)), Thomas Böhlke (Karlsruhe Institute of Technology (KIT))
Kurzfassung:
We present a two-scale anisotropic damage model that captures matrix damage and fiber-matrix interface debonding. Based on the fiber orientation distribution and a Weibull probability distribution of the interface strength, the damage evolution on the microscale is determined. Within this work focus lies on the comparison of different matrix damage evolution models. To predict the macroscopic behavior, a mean field homogenization with the Mori-Tanaka method based on orientation tensors of second and fourth order is applied.
17:20
Combined Macro- and Micro-Mechanical Analysis of Instable Crack Propagation in Interlaminar Fracture Toughness Tests
Michael Schober (Karlsruhe Institute of Technology (KIT)), Jörg Hohe (Fraunhofer Institute for Mechanics of Materials IWM), Takashi Kuboki (University of Western Ontario)
Kurzfassung:
Fracture toughness experiments with fiber reinforced polymers often show instable growths of the observed cracks. Such discontinuities can occur as a result of the test specimen’s microstructure. A combined macromechanical micromechanical simulation approach shall help understanding the occurrence of discontinuities with respect to the specimen’s microstructure. Therefore, the fracture toughness test specimen’s microstructure is analyzed and modeled for finite element analyses.
Combined Macro- and Micro-Mechanical Analysis of Instable Crack Propagation in Interlaminar Fracture Toughness Tests
Michael Schober (Karlsruhe Institute of Technology (KIT)), Jörg Hohe (Fraunhofer Institute for Mechanics of Materials IWM), Takashi Kuboki (University of Western Ontario)
Kurzfassung:
Fracture toughness experiments with fiber reinforced polymers often show instable growths of the observed cracks. Such discontinuities can occur as a result of the test specimen’s microstructure. A combined macromechanical micromechanical simulation approach shall help understanding the occurrence of discontinuities with respect to the specimen’s microstructure. Therefore, the fracture toughness test specimen’s microstructure is analyzed and modeled for finite element analyses.