Stress–strain relations for hydrogels under multiaxial deformation

摘要: Abstract Constitutive equations are derived for the elastic response of swollen elastomers and hydrogels under an arbitrary deformation with finite strains. An expression is developed free energy density a polymer network based on Flory concept flexible chains constrained junctions solvent-dependent reference configuration. The importance introduction configuration evolving swelling confirmed by analysis experimental data nanocomposite subjected to drying. Adjustable parameters in stress–strain relations found fitting observations elastomers, chemical gels (linked covalent bonds sliding cross-links), physical uniaxial stretching, equi-biaxial tension, pure shear. Good agreement demonstrated between results numerical simulation. A pronounced difference revealed effect solvent content moduli gels.