I've been working on a model that involves high levels of strain using Neo-Hookean material properties. I've been using plane183 elements since these seem to be about the only element type that can have Neo-Hookean material properties, at least for plane stress problems.
In several situations, I've been encountering element formulation errors. I've tried Googling strategies for overcoming these errors; however, I'm not gathering much good advice, aside from the vague recommendation to modify the mesh.
Does anyone have practical suggestions for overcoming element formulation errors in a nonlinear analysis? Even some greater insight into what could cause element formulation errors would be helpful. Thanks