Mechanical response of HEMA gel under cyclic deformation: Viscoplasticity and swelling-induced recovery. (1st January 2015)

• Record Type: Journal Article
• Authors: Drozdov, A.D.; Sanporean, C.-G.; de C. Christiansen, J.
• Is Part Of: International journal of solids and structures. Volume 52(2015)
• Page Start: 220
• Page End: 234
• Publication Date: 2015-01-01
• Subjects: Hydrogel -- Finite viscoplasticity -- Self-recovery -- Constitutive modeling; Mechanics, Applied -- Periodicals; Structural analysis (Engineering) -- Periodicals; Elastic solids -- Periodicals; Mécanique appliquée -- Périodiques; Constructions, Théorie des -- Périodiques; Solides élastiques -- Périodiques; Elastic solids; Mechanics, Applied; Structural analysis (Engineering); Periodicals; 624.18
• DOI: 10.1016/j.ijsolstr.2014.10.009
• Languages: English
• ISSNs: 0020-7683

Abstract

Abstract: Observations are reported on poly(2-hydroxyethyl methacrylate) (HEMA) gels with various degrees of swelling in uniaxial tensile tests, relaxation tests, cyclic tests with a strain-controlled program, and multiple-step tests where cyclic deformation is alternated with periods of re-swelling. Constitutive equations are derived for solvent transport and the viscoplastic response of a hydrogel under an arbitrary deformation with finite strains. Adjustable parameters in the stress-strain relations are found by fitting the experimental data. Special attention is focused on the self-recovery phenomenon: a decay in plastic deformation under swelling of a preloaded sample.