Drozdov, Aleksey1; Christiansen, Jesper de Claville1
1 Department of Mechanical and Manufacturing Engineering, The Faculty of Engineering and Science, Aalborg University, VBN2 The Faculty of Engineering and Science, Aalborg University, VBN3 Materials Engineering and Science, The Faculty of Engineering and Science, Aalborg University, VBN
Constitutive equations are derived for the elastic response of hydrogels under an arbitrary deformationwith finite strains. An expression is proposed for the free energy density of a hydrogel based on the Floryconcept of a network of flexible chains with constrained junctions whose reference configuration differsfrom the initial configuration of a fully swollen gel. Adjustable parameters in the stress–strain relationsare found by fitting observations on poly(acrylamide) and gellan hydrogels under uniaxial tension andcompression. The effect of elongation ratio on osmotic Poisson’s ratio is examined numerically.
Mechanics Research Communications, 2013, Vol 50, p. 33-38