Seminar: Aerospace Materials Research Using Peridynamics

by Hilal Koç | Aug 22, 2022
This talk will have two parts: (1) Multi-scale deformation and failure analysis of carbon nanotube-based composites and (2) response of aerospace structures to high-velocity droplet impact. Both topics utilize the emerging computational mechanics approach peridynamics.

Aerospace Materials Research Using Peridynamics

By: Ibrahim Guven, Associate Professor, Mechanical and Nuclear Engineering, Virginia Commonwealth University, Richmond, Virginia, USA

Date and Time: 06 September 2022-13:30
Place: Mavi Salon (Faculty of Mechanical Engineering-Gumussuyu)

Abstract: This talk will have two parts: (1) Multi-scale deformation and failure analysis of carbon nanotube-based composites and (2) response of aerospace structures to high-velocity droplet impact. Both topics utilize the emerging computational mechanics approach peridynamics. 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. The multi-scale analysis portion concerns the work being performed towards making structural composite material for the planned crewed mission to Mars. This work is funded by NASA under the Space Technologies Research Institute program. The high-velocity droplet impact problem explores the interaction between water droplets and aircraft surfaces at conditions Mach 3 and above. The droplet shape at the time of impact is provided by computational fluid dynamics simulations. High strain rate response of metallic and ceramic aerospace materials is explored. This work is funded by the US Office of Naval Research.

Bio: 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.

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İTÜ Faculty of Mechanical Engineering

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İTÜ Faculty of Mechanical Engineering takes pride in having close to 100 years of Mechanical Engineering tradition, and has currently 33 Professors, 12 Associate Professors, 24 Assistant Professors and 15 Lecturers as Faculty members. At present, we have over 2000 undergraduate students, all of which were selected among the top ~0.5% of the ~2.3 million students taking the nationwide university entrance exam annually.

Founded in 1933, the Faculty of Mechanical Engineering received its current name in 1944. With the university reform in 1933, the Institute of Electricity and Machines of the Istanbul University was replaced by the Electro-Mechanic Department; and by doing so our Mechanical Engineering education, which still continues, began 87 years ago. 11 years later in 1944, the name of the institution was changed to Istanbul Technical University and under it a separate school/college of Mechanical Engineering was founded with the current name: “Faculty of Mechanical Engineering“.

İTÜ Faculty of Mechanical Engineering performs research and education in the design, development and production planning of all types of mechanical and energy transformation systems. Our 75 Faculty members are performing research and development in a wide range of areas related to both immediate needs of the industry and also cutting edge science for future technologies and applications. Our research areas include, but not limited to, Automotive Industry, Petrochemical Industry, Robotics, Textile Industry, Defense Industry, Reverse Engineering, Clean Energy, Renewable Energy, Underground Gasification, MEMS, Nanotechnology, Pharmaceutics, and Biomolecular Engineering.

With its gorgeous Ottoman era building providing extensive lab space, massive laboratory and research investment performed in the past 87 years, and the recent addition of the 1500 m2 big Dr. Keskin Keser student lab building, the Faculty of Mechanical Engineering has one of the most extensive educational and research laboratories in Turkey and provides its students with top quality Mechanical Engineering education in a gorgeous historical building located at a prime location in the very heart of Istanbul.