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ME-EM Graduate Seminar Speaker Series
Ibrahim Guven, PhD
Virginia Commonwealth University
The main concern with continuum mechanics-based frameworks with respect to impact damage is their handling of discontinuities. The constitutive relationships are expressed in terms of partial differential equations, which are undefined at discontinuities such as fractures. In 2000, Silling presented peridynamics (PD), a reformulation of the elastic theory to account for those discontinuities and long-range forces. He reorganized the constitutive equations into integral equations, which are defined everywhere, including at discontinuities. Peridynamics has been shown to accurately predict fracture and crack propagation, including crack branching, where FEM often fails. PD also handles contact intrinsically via short-range repulsive forces, which keep nodes no closer than a certain distance. Because these short-range forces ignore the nodes’ initial configuration, large deformation is not an issue with respect to contact forces.
Water droplet impact is one of the most concerning problems under the hypersonic weather encounter umbrella. This topic explores the interaction between water droplets and aircraft surfaces at conditions Mach 3 and above. The droplet shape at the time of impact is predicted by computational fluid dynamics simulations. A peridynamic water model is used for the droplet and high strain rate responses of metallic materials are explored.
Ibrahim Guven is an Associate Professor of Mechanical and Nuclear Engineering at Virginia Commonwealth University. Previously, he was a tenure-track Assistant Professor of Materials Science and Engineering at The University of Arizona. He spent two summers at US Air Force Research Laboratory as a summer faculty fellow. He also served as a visiting scientist at the Institute of Physics at The University of Rennes 1 multiple times. Prof. Guven is the General Chair of the 2023 IEEE EPS Electronic Components and Technology Conference. His research is funded by NASA, Air Force, Office of Naval Research, Boeing, and Raytheon.
Invited by: Greg Odegard
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