Dresden 2011 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 46: Mechanical Properties III
MM 46.9: Talk
Friday, March 18, 2011, 12:30–12:45, IFW D
A phase-field study of crack propagation — •Daniel Schneider1, Jan Höhn1, Michael Selzer1,2, Alexander Vondrous2, Marcus Jainta2, and Britta Nestler1,2 — 1Institute for Reliability of Components and Systems, Karlsruhe Institute of Technology — 2Institute of Materials and Processes, Karlsruhe University of Applied Science
An extension of the phase-field model is formulated incorporating a formulation for elastic and plastic effects on the evolution of microstructure. We show an approach to describe linear elasto-plastic and linear hardening material behavior based on the Prandtl-Reuss model in the context of the phase-field method. Adapted boundary conditions for the different field quantities allow a more accurate modeling of experimental processes. We validate the simulations by a comparison of stress profiles with analytically predicted stress fields of brittle fracture and with the energy criterion according to Griffith theory. Further we present simulations of micro crack propagation induced by external stresses in both, two phase systems as well as polycrystalline structures. The dynamics of the crack formation and the shape of the phase boundaries are analyzed for different processing conditions.