Quasistatic Nonlinear Viscoelasticity and Gradient Flows

J. M. Ball, Y. Şengül

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We consider the equation of motion for one-dimensional nonlinear viscoelasticity of strain-rate type under the assumption that the stored-energy function is λ-convex, which allows for solid phase transformations. We formulate this problem as a gradient flow, leading to existence and uniqueness of solutions. By approximating general initial data by those in which the deformation gradient takes only finitely many values, we show that under suitable hypotheses on the stored-energy function the deformation gradient is instantaneously bounded and bounded away from zero. Finally, we discuss the open problem of showing that every solution converges to an equilibrium state as time t→∞ and prove convergence to equilibrium under a nondegeneracy condition. We show that this condition is satisfied in particular for any real analytic cubic-like stress-strain function.
Original languageEnglish
Pages (from-to)405-442
Number of pages38
JournalJournal of Dynamics and Differential Equations
Volume27
Issue number3-4
DOIs
Publication statusPublished - Dec 2015

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