报告题目：Interface Motion in Polycrystals Geometrical Constraints and Variational Modeling
报告嘉宾：Klaus Hackl 教授
邀请人：何宜谦 教授
报告时间：2025年5月16日 14:00
报告地点：综合实验一号楼602
报告人介绍：Prof. Hackl is the Professor of Institute of Mechanics of Materials at Ruhr University Bochum, Germany. He graduated from Universität Karlsruhe for Bachelor of physics, graduated from Universität Heidelberg for Master of mathematic and graduated from RWTH Aachen for Ph.D of mechanics. He worked at Technische Universität Graz, and has been the Chair Professor of Institute of Mechanics of materials at Ruhr University Bochum from 1999 to now, Professor Hackl’s research interests includes Micromechanics, Mechanics of materials, Variational methods, and Numerical methods. He won the Feodor-Lynen Fellowship of Alexander Von Humboldt Foundation. He has published more than 300 papers, 7 books and 12 chapters in edited books, the total citation is 4124. Prof. Hackl is the Associate Editor of International Journal for Computational Multiscale Engineering, and also the editors for Continuum Mechanics and Thermodynamics, Journal of Mechanical Behavior of Materials and Smart Materials Research.
报告摘要：Interface motion in polycrystals is one of the key processes determining the microstructure and the properties of material aggregates. It may be driven by different physical processes like phase-transformation or diffusion through the bulk or along interfaces or surfaces. These can in principle be described very well using thermodynamic extremal principles, for example that one of maximum dissipation. However, difficulties arise when it comes to formulating interface and transition conditions at junction lines and points of the aggregate. And considerable dispute on this topic can be found in the literature. An approach will be presented, that allows to derive these conditions via pure geometrical arguments while being completely consistent with the extremum principle employed. No ambiguity remains. We will apply the proposed framework to the modeling of thermal grooving.
REFERENCES
[1] Hackl, K., Fischer, F.D., and Svoboda, J., 2011, ”A study on the principle of maximum dissipation for coupled and non-coupled non-isothermal processes in materials”, Proceedings of the Royal Society A, 467, 1186.
[2] Fischer, F.D., Svoboda, J., and Hackl, K., 2012, ” Modelling the kinetics of a triple junction”, Acta Materialia, 60, 4704.
[3] Hackl, K., Fischer, F.D., Klevakina, K., Renner, J., and Svoboda, J., 2013, ”A variational approach to grooving and wetting”, Acta Materialia, 61, 1581.
[4] Hackl, K., Fischer, F.D., and Svoboda, J., 2017, ”A variational approach to the modelling of grooving in a three-dimensional setting”, Acta Materialia, 129, 331.
