Stress-Tensor Expression in Two-Temperature Models for the Aging and Yielding of Glasses (INVITED)

Abstract eng:
This paper is concerned with modeling the influence of physical aging on the yield- and postyield-behavior of glassy materials. To that end, the concept of two distinct subsystems (kinetic and configurational) is combined with elasto-viscoplasticity. Using nonequilibrium thermodynamics, it is shown that the stress tensor is in general not simply related to the derivative of the thermodynamic potential with respect to deformation, but that there can be non-potential contributions (akin to hypoelasticity) that vanish as the system tends to thermal equilibrium.

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