Naval Research Laboratory
The Story of Microstructure-Sensitive Corrosion Pit Growth and Mechanical Performance
Structural corrosion is a formidable problem both in terms of the financial cost to the naval and maritime industries as well as the effort required to perform accurate computational modeling. At the continuum level, comprehensive modeling of corrosion requires coupling of electrochemical relations and balance of mass involving multiple species; constitutive descriptions of reaction rates and species diffusion mechanisms in the electrolyte; and conditions governing the movement of metal-electrolyte interface. At the Naval Research Laboratory, we are using a gradual, stepwise modeling approach--from simpler to complex phenomena--to investigate the effect of microstructure on corrosion pit growth and its subsequent effect on mechanical performance. In this talk, we will describe this journey in terms of the technical challenges, modeling approach based on the various options available within the evolving module library of COMSOL, and specific results at various stages of development.
Dr. Siddiq Qidwai is a Mechanical Engineer at the Multifunctional Materials Branch of the US Naval Research Laboratory (NRL) in Washington, DC. Prior to joining NRL as an employee, he was a federal contractor at the same institution, working for Geo-Centers, Inc. and Science Applications International Corporation (SAIC) successively. Dr. Qidwai is an expert in the area of computational mechanics and materials science with strong focus in constitutive modeling and multiphysics phenomena.
Dr. Qidwai's current research topics are microstructure-sensitive corrosion modeling, biomechanical modeling of the human head under extreme conditions, and electrically-assisted deformation of metals. His recent and past contributions in the research arena include design of multifunctional structure-power material systems, microstructure-property correlations in metals, and computational modeling of smart materials, specifically piezoelectric materials and shape memory alloys (SMAs) for which he is widely acknowledged. He is an author or co-author of over 85 publications, including 23 archival journal papers and two book chapters, and holds one patent. Dr. Qidwai is the recipient of the 2009 SAIC Publications Award and 2003 Geo-Center's Technology Transfer Award. He is also cited as the coauthor of the paper selected for NRL's 2010 Alan Berman Research Publication Award. Dr. Qidwai is the serving Chair of the Washington DC Section of the American Society of Mechanical Engineers. He received his PhD (1999) and MS in Aerospace Engineering from Texas A&M University, and his BS in Mechanical Engineering from Middle East Technical University (Ankara, Turkey).