Seminar: Peridynamic Modeling of Corrosion Damage and Fracture
Material damage induced by corrosion can trigger sudden failure of structures by introducing pits that act as stress concentration points from which cracks initiate and propagate catastrophically. Many materials are also susceptible to Stress Corrosion Cracking (SCC) in which changes introduced in the material by corrosion processes dramatically reduce its fracture toughness. This talk will present our efforts on predicting the evolution of corrosion damage, pitting corrosion, and SCC, to better understand failure of materials in corrosive environments. The new models we introduced are of peridynamic type (nonlocal models) that allow for a consistent treatment of damage and cracks in a variety of forms in which they are present in corrosion processes. I will cover a recent model we introduced that is capable of simulating the passivation, salt-film formation, and the autonomous formation of lacy covers in pitting corrosion. The computational results under potentiostatic conditions are in excellent agreement with experiments in both time-scale and length-scale. The model is also used to investigate the effect stresses have on corrosion rates, and SCC. I will give a brief account on why peridynamic modeling of fracture, damage, fragmentation is useful.
About the Speaker
Prof. Bobaru obtained his Ph.D. in Theoretical and Applied Mechanics from Cornell University in 2001. He holds B.S. (1995) and M.S. (1997) degrees in Mathematics and Mechanics of Solids from University of Bucharest. He joined University of Nebraska-Lincoln as Assistant Professor in 2001, where he has been Full Professor of Mechanical and Materials Engineering since 2013. Prof. Bobaru has had Visiting Scholar appointments at Sandia National Laboratories (2002-2005, 2009), at Cambridge University (2008), at California Institute of Technology (2011), at University of Padova (2015), and at University of Texas at Austin (2015). He has published extensively on peridynamic modeling of dynamic fracture and failure and he introduced peridynamic models for heat flow in bodies with evolving discontinuities and corrosion damage. Other publications include shape and material optimization, and dynamics of granular materials. He is the main editor of the recently published “Handbook of Peridynamic Modeling”.
Hosted by Professor Soheil Soghrati