Session Details
MS10-1: Mechanics of Dissipative Solids: Plasticity, Fracture and Damage (Ganzes Minisymposium anzeigen)
Thursday, 12. October 2017; 16:00 - 18:00 Uhr in Raum 7.11
Sitzungsleitung: Fadi Aldakheel
16:00
Modeling fatigue phenomena with a variational phase-field approach (Keynote)
Roberto Alessi (Sapienza University of Rome), Marreddy Ambati (Technical University of Braunschweig), Laura De Lorenzis (Technical University of Braunschweig), Stefano Vidoli (Sapienza University of Rome)
Kurzfassung:
Fatigue is a key phenomenon in mechanics and is responsible for most of structural failures. Nevertheless, the development of reliable mathematical fatigue models is still an open issue. In this work we present, step-by-step, a new variational phase-field model able to account for fatigue effects. As a strain history variable increases, on which the model relies on, the material fracture toughness is reduced, such to favour cracks where the highest strain variations have occurred.
Modeling fatigue phenomena with a variational phase-field approach (Keynote)
Roberto Alessi (Sapienza University of Rome), Marreddy Ambati (Technical University of Braunschweig), Laura De Lorenzis (Technical University of Braunschweig), Stefano Vidoli (Sapienza University of Rome)
Kurzfassung:
Fatigue is a key phenomenon in mechanics and is responsible for most of structural failures. Nevertheless, the development of reliable mathematical fatigue models is still an open issue. In this work we present, step-by-step, a new variational phase-field model able to account for fatigue effects. As a strain history variable increases, on which the model relies on, the material fracture toughness is reduced, such to favour cracks where the highest strain variations have occurred.
16:40
Phase field modelling of thermo-mechanically driven fracture processes in electronic control units
Fabian Welschinger (Robert Bosch GmbH)
Kurzfassung:
Phase field models for fracture allow shaping the reliability of engineering components in the early stage of the product development process. Epoxy-based molding compounds protect electronic control units from harsh environments. Once this protection fractures, the electronic system fails. Based on a fracture mechanical characterization of the mold material in the full temperature range, computations are performed demonstrating the predictive quality of the phase field model of fracture.
Phase field modelling of thermo-mechanically driven fracture processes in electronic control units
Fabian Welschinger (Robert Bosch GmbH)
Kurzfassung:
Phase field models for fracture allow shaping the reliability of engineering components in the early stage of the product development process. Epoxy-based molding compounds protect electronic control units from harsh environments. Once this protection fractures, the electronic system fails. Based on a fracture mechanical characterization of the mold material in the full temperature range, computations are performed demonstrating the predictive quality of the phase field model of fracture.
17:00
A phase field model for porous plastic solids at ductile fracture
Daniel Kienle (University of Stuttgart), Fadi Aldakheel (Leibniz Universität Hannover), Stephan Teichtmeister (University of Stuttgart), Christian Miehe (University of Stuttgart)
Kurzfassung:
This work outlines a variational framework for the phase field modeling of fracture in porous plastic solids. The phase field regularizes sharp crack surfaces by a specific gradient damage formulation. A model for porous plasticity with a growth law for the evolution of the void fraction is developed and linked to a failure criterion in terms of the elastic-plastic work density. It is shown that this approach is able to model basic phenomena of ductile failure such as cup-cone failure surfaces.
A phase field model for porous plastic solids at ductile fracture
Daniel Kienle (University of Stuttgart), Fadi Aldakheel (Leibniz Universität Hannover), Stephan Teichtmeister (University of Stuttgart), Christian Miehe (University of Stuttgart)
Kurzfassung:
This work outlines a variational framework for the phase field modeling of fracture in porous plastic solids. The phase field regularizes sharp crack surfaces by a specific gradient damage formulation. A model for porous plasticity with a growth law for the evolution of the void fraction is developed and linked to a failure criterion in terms of the elastic-plastic work density. It is shown that this approach is able to model basic phenomena of ductile failure such as cup-cone failure surfaces.