Materials Science and Engineering Seminar - Professor Ramana M Pidaparti
Professor Ramana M Pidaparti (Fellow of ASME, Royal Aeronautical Society & AAAS) College of Engineering, University of Georgia, Athens, USA gave talk at the MSE Seminar Series, IIT Gandhinagar
Title: Corrosion-Fatigue in Metal Systems through Multiscale Discrete Models
Corrosion-fatigue in metal alloys (aluminum, steel, and titanium) generally involves the formation of pits, pit growth, nucleation of cracks from pits, and the eventual crack propagation to failure. Pitting corrosion-fatigue is recognized to be one of the major potential degradation mechanisms in many metals, when left unchecked, can lead to catastrophic failures. Corrosion pits are seen to significantly shorten the fatigue crack initiation; decrease the threshold stress intensity by 50% or more; and lower the fatigue strength by about 40%. Even though the corrosion and fatigue mechanisms have been studied well individually, the coupled effects of corrosion and fatigue have not been studied in detail. With corrosion-fatigue being generally recognized by the structural integrity community as a potential cause for failure in many structures and materials, and the need for predictive methodologies and models cannot be overstated. This, in turn, would also reduce repair and maintenance costs. Quantitative analysis through multiscale discrete models for corrosion through computational simulations and imaging data that correlates to pitting and cracking is being investigated. These analysis models will be presented and discussed at the conference.
We are grateful to Professor Ramana Pidaparti for visiting the campus and interacting with us. It was our sincere pleasure hosting him on the campus.