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Seminar | Energy and Global Security

Materials Tribology: Exploring Grinding, Sliding, and Scratching Using Particle Method Simulations

EGS Seminar

Abstract: I will briefly introduce the Austrian Center of Competence for Tribology (AC2T), where research is divided into four areas: lubricants & interface mechanisms, wear processes & protection, friction surface phenomena & tribodiagnostics, and computation & experimental simulation. This talk will focus on some of my own recent work on classical molecular dynamics (MD) simulations of dry sliding and abrasive processes, as well as work carried out in my group where scratching is simulated using mesoscopic particle methods. With the high-performance computing cluster available at AC2T (~700 computation cores) and access to the Vienna Scientific Clusters 3 and 4, it is possible to treat MD systems with tens of millions of atoms, which allows the consideration of polycrystalline systems featuring grain sizes of the order of 50 nm for several nanoseconds. Therefore, macroscopic material behavior under tribological loading can be, at least qualitatively, reproduced and studied. I will share some recent simulation results dealing with the interfacial microstructure evolution due to strain path changes in sliding contacts, where polycrystalline Cu and Fe contacts undergo a transient softening stage with grain coarsening when the sliding direction is reversed. I will also give a brief summary of the near-surface microstructure evolution map for CuNi alloys under sliding using large-scale molecular dynamics.

Bio: Stefan J. Eder received his graduate degree in technical physics. He is a project manager at AC2T Research GmbH, where he completed his Ph.D. studies on the atomistic simulation of mixed- and boundary-lubricated friction contacts.