Session Details

08:30
Extension of isogeometric Kirchhoff-Love shell formulations towards fracture and plasticity problems
Marreddy Ambati (Technical University of Braunschweig), Josef Kiendl (Norwegian University of Science and Technology), Laura De Lorenzis (Technical University of Braunschweig)

Kurzfassung:
Firstly, the isogeometric Kirchhoff-Love (KL) shell model is combined with phase-field fracture description. Secondly, the KL shell formulation is applied to elasto-plastic models at large deformations. Thirdly, this elasto-plastic KL shell formulation is coupled with phase-field ductile fracture model. A careful investigation on various numerical and benchmark examples and detailed comparisons with 3D solid simulations and with solutions from the literature are carried out.

08:50
A phase field model for materials with anisotropic fracture resistance
Christoph Schreiber (University of Kaiserslautern), Charlotte Kuhn (University of Kaiserslautern), Ralf Müller (University of Kaiserslautern)

Kurzfassung:
Directional dependency of the fracture resistance, which is observed for a wide range of materials, requires the integration of anisotropic behavior in approaches for crack growth simulations. The gradient term in the energy functional of a phase field model for isotropic brittle fracture is enhanced accounting for an anisotropic material resistance. Results of crack path simulations for different samples are presented to show the accuracy of the proposed model.

09:10
Affine Full Network Model for Strain-Induced Crystallization in Rubbery Polymers
Aref Nateghi (University of Stuttgart), Hüsnü Dal (Middle East Technical University), Marc-André Keip (University of Stuttgart), Christian Miehe (University of Stuttgart)

Kurzfassung:
We propose a micro-mechanically motivated material model for strain-induced crystallization in rubbers. Our point of departure is constructing a micro-mechanical model for a single crystallizing polymer chain. A thermodynamically consistent evolution law describing the kinetics of crystallization in the chain level is then proposed. The chain model is incorporated into the affine full network model. Finally, the numerical performance of the model is compared to the experimental data.

09:30
On Degradation Functions and Solution Schemes for a Phase Field Model of Elastic-Plastic Fracture
Timo Noll (University of Kaiserslautern), Charlotte Kuhn (University of Kaiserslautern), Ralf Müller (University of Kaiserslautern)

Kurzfassung:
A phase field model for elastic-plastic fracture is presented, which is based on an energy functional composed of an elastic energy contribution, a plastic dissipation potential and an fracture energy. The coupling of the mechanical fields with the fracture field is modeled by a degradation function. Numerical simulations are presented, where the choice of the degradation function is investigated and a staggered solution scheme is compared to an also possible monolithic iteration scheme.

09:50
Phase Field Model for Interface Failure
Arne Claus Hansen-Dörr (Technische Universität Dresden), Paul Hennig (Technische Universität Dresden), Markus Kästner (Technische Universität Dresden)

Kurzfassung:
A phase field model for interface failure between two materials is proposed where the interface is incorporated by a local reduction of the critical fracture energy. Due to the use of a regularised crack model, interaction between the length scales of the crack and the material interface has to be analysed. A local approach is presented, that compensates the influence on the actual numeric fracture toughness at which the crack propagates along the interface.