Title: Coupling species migration and phase transformation in strained solids
Abstract. Multicomponent materials such as polymer gels and interstitial solid solutions have in common the nature of their constituents: they are composed of a host solid of fixed composition and guest species that can move through the interstitial space of the host constituent. Such a material has a definite shape inherited from the host component and variable composition since the number of guest species can change. Hence, modeling the behavior of this type of solid body requires a proper treatment of mechanical and chemical phenomena brought about by changes in shape and composition, a task that can become still more complicated in the presence of phase transformations.
In this talk, I first discuss the continuum-mechanical derivation of coupled theories of deformation, species migration, and phase transformation in materials that belong to the class described above. And then provide applications involving phase transformation induced by species migration in polymer gels and metal-hydrogen systems. Finally, if time permits, I will comment on how the general ideas introduced can be extended to account for fracture and other interesting phenomena.
Bio. Fernando Pereira Duda is a full professor at the Federal University of Rio de Janeiro, Rio de Janeiro, Brazil. He got his Ph.D. in Mechanical Engineering from the Federal University of Rio de Janeiro in 1996 under the direction of Luiz Carlos Martins on continuum mechanics. After his Ph.D., F.P. Duda got a post-doc position at the National Laboratory of Scientific Computation, Rio de Janeiro, to work on the mechanics and geometry of the swimming of microorganisms. He joined the Mechanical Engineering Program at the Federal University of Rio de Janeiro in 1996 and currently holds the department head position. His research interest lies in continuum physics, with emphasis on applications in multiscale and multiphysics phenomena.