Yeah, you just have to pick 3 faces of the cube meeting at the same corner and for each face fix the displacement in the axis perpendicular to the face. Then pick a face opposite to one of the symmetry faces and apply a prescribed displacement boundary condition (or surface traction load if the problem is force-controlled) acting in the direction perpendicular to it. This will let you avoid any overconstraint due to supports and is commonly used for single-element test models (you can find some in the Abaqus Verification Guide, for instance).
Displacement driven up to a maximum Stretch of 1.6.
I’m finally constraining 2 and 1 point for the x and Y directions. If not, the model is too rigid and isolated elements at the symmetry planes mess the convergence.
I have obtained very similar curves for the different time steps I’m, using.
My first attempt has been in Prepomax, but the animation has broken the model.
I don’t have too much memory at my home computer, and I guess that was the problem.
First question is how to measure or what does it even mean the nominal stress in an RVE that also it’s necking?
Depending on the element the stress is different and in terms of Stress I think it only has meaning if they are understand as mean values.
Same for strains. That’s why I’m plotting the overall External load against the imposed Stretch. Pure Ferritic, Pure Martensitic and Heterogeneous model.
The typical results obtained from RVEs are homogenized properties (for use in macro scale models) and averaged stress and strain fields. Abaqus has a plug-in to generate them. Then it’s also possible to compare them with results obtained with MFH approach or use it instead of RVEs for simpler cases.
