Hi All,

I am new to the forum and new to ABAQUS CAE so please excuse my ignorance.

I am trying to model the self-heating effect of a viscoelastic polymer using the hyperelastic (NeoHookean) and viscoelastic (Prony coefficients with WLF) options in ABAQUS. I built a very simple 3D model of the polymer slab sandwiched between steel plates. I shear the polymer by applying a cyclic shear displacement (equivalent to 20% shear strain) on one of the steel plates while holding the other. I have a lot of difficulty making the model converge as it tends to stop at the very first step and gives me the error Too many iterations required and I get warnings saying I have excessive distortion in many of my elements. I can get the first few steps to converge when I apply a shear traction instead, but as soon as the deformations becomes large enough, I get the same warning and the analysis fails. I feel that the aspect ratio of my elements are generally good, but since the damping material is expected to go beyond 200% or maybe 300%, it worries me since the model cant even reach 20%. I have made my mesh finer but that didnt solve my problem except taking substantially longer to solve (since I need to have a 3D model for getting the heat flow analysis as well). I am not sure if the problem is in my definition of the Neo-Hookean properties or in the Prony series since I have determined these parameters outside of Abaqus as we only have pure shear tests at different frequencies and temperatures.

It would be great if someone can give me some suggestions. Any help is greatly appreciated! I can send the inp file via email if requested.

Jack