FOR 1650:  Dislocation Based Plasticity

• Subject Area: Materials Science and Engineering
• Term: from 2011 to 2021
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 189971049

The aim of our Research Unit is to develop physically-based simulation methods for the prediction of deformation processes in metallic materials on the micro- and sub-microscale. The modelling is based on well-defined averaging processes, which are able to preserve many important information from the scale of line-like crystal defects (discrete dislocations) and to transport them to the scale of a continuous field theory: our "Continuum Dislocation Dynamics" (CDD) theory. CDD is able to represent the flux, the orientation and change of orientation of curved dislocations by means of an extended dislocation density tensor.
The advantage of this approach if compared to discrete methods, as e.g. atomistic simulations or discrete dislocation dynamic simulations, is the computational efficiency (the number of degrees of freedom of a dislocation density based continuum model do not depend on the number of dislocations); the advantage if compared to classical continuum models is the large amount of additionally available physical information. Since many details of real dislocation microstructure are readily available in CDD, we can verify our model and identify statistical parameter by comparing to discrete dislocation dynamic simulations and experiments.
Our approach becomes possible through interdisciplinary cooperation of scientific research units from continuum mechanics, theoretical and experimental materials science, numerical maths as well as from statistical physics.

• DFG Programme: Research Units

Projects

• CDD as a Mesoscopic Field Theory: Dynamic Closure and Multiphysics Extension (Applicant Sandfeld, Stefan )
• Central project (Applicant Gumbsch, Peter )
• Constitutive laws for continuum dislocation dynamics (Applicant Hochrainer, Thomas )
• Continuum Dislocation Dynamics (Applicant Gumbsch, Peter )
• Deterministic and Stochastic Continuum Models of Dislocation Patterning (Applicant Zaiser, Michael )
• Discrete Dislocation Dynamics (Applicant Weygand, Daniel )
• Dislocation based Gradient Plasticity Theory (Applicant Böhlke, Thomas )
• Efficient Numerical Solution Methods for Dislocation based Plasticity (Applicant Wieners, Christian )
• Experimental characterization of micro plasticity and dislocation microstructure (Applicant Gruber, Patric Alfons )

• Spokesperson: Professor Dr. Peter Gumbsch
• Deputy: Professor Dr.-Ing. Thomas Böhlke