A note about hardening-free viscoelastic models in Maxwellian-type rheologies at large strains

Maxwellian-type rheological models of inelastic effects creep type at large strains are revisited in relation to strain gradient theories. In particular, we observe that a dependence the stored energy density on gradients may lead spurious hardening effects, preventing model from accommodating slips. The main result this paper is an alternative type, where higher-order contribution provided by elastic and plastic rate, thus onset under combination Kelvin–Voigt damping Maxwellian results Jeffreys-type model. existence weak solutions proved way Faedo–Galerkin approximation.