Thermomechanische Modelle für amorphe Polymere zur Beschreibung von Schubfließen und Spannungsrissbildung.

• Antragsteller: Dr.-Ing. Hüsnü Dal; Professor Dr.-Ing. Marc-André Keip, seit 10/2016
• Fachliche Zuordnung: Mechanik
• Förderung: Förderung von 2007 bis 2014
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 36678517

Industrial applications of amorphous polymers such as polycarbonates or polystyrenes cover the automotive industry, the medical technology and the production of high-tech electronic devices. In this context, the construction of predictive continuum-based models for the response of polymeric devices under non-isothermal loading conditions is of high importance for the technological design as well as the production of new materials. Goal of the research project is the development of a fully coupled thermo-viscoplastic material description for amorphous polymers that inherently embodies the rate- and temperature-dependent micro structure evolution. The models to be developed must account for micro-phenomena such as the competition of micro-shear yielding and crazing. The evolution of these micro-phenomena is associated with temperature, as well as molecular mechanisms involving disentanglement, scission, plastic orientation of the constituent macromolecules. The outgrowth on the overall macro-level determines the brittle to ductile transition of the material. The micromechanical effects are intended to be described by new thermo-mechanical hybrid micro-macro approaches for large-scale analyses, where the crazing is modeled by macroscopic structural tensors. The new thermo-mechanical model concepts are intended to describe brittle-ductile fracture by phase field type fracture theory. The overall result of the project will be new theoretical and algorithmic formulations for predictive large-scale analyses ofthermomechanical deformation and failure processes of amorphous polymers.

• DFG-Verfahren: Sachbeihilfen
• Ehemaliger Antragsteller: Professor Dr.-Ing. Christian Miehe, bis 9/2016 (†)