Theory and Experiments on Multiphysics Coupling in Polymer Oxidation
Materials Science and Engineering Seminar
Mechanical Engineering – Engineering Mechanics
Michigan Technological University
Abstract: High temperature oxidation in polymers is a strongly coupled, highly nonlinear and complex process which limits the use of polymeric materials in several aerospace and defense application as it causes significant performance degradation. The coupled diffusion-reaction process that occurs during thermo-oxidation together with the macromolecular network behavior and finite viscoelasticity of a polymer require a time, temperature and oxidation dependent constitutive law to predict the mechanical response of the material. The objective of the present research is to develop an experimentally informed thermodynamically-consistent continuum level theory and implement in finite elements, to describe the coupled thermo-chemo-mechanical process that occurs predominantly at high temperature due to oxidation in polymers. In this talk, I will present the theory of a thermodynamically consistent multiphysics framework for polymer oxidation incorporating the coupling between the reaction kinetics and the general state of stress. The numerical performance of the model and comparison with several stress-coupled oxidation experiments will also be highlighted to validate the predictive capability.
Bio: Trisha Sain is an Assistant Professor in the Department of Mechanical Engineering-Engineering Mechanics at Michigan Technological University. Her research interests in the area of computational solid mechanics include, multiphysics modeling of polymers, materials under extreme envirornment, fracture and failure of materials, architectured materials design for improved functionalities, composite materials. Prior joining as a faculty, she was a post-doc at University of Michigan, Ann Arbor. She earned her PhD from Indian Institute of Science with a specialization in computational solid mechanics.
Monday, November 4, 2019 at 4:00 p.m. to 5:00 p.m.
Minerals and Materials Engineering Building (M&M), 610
1400 Townsend Drive, Houghton, MI 49931