We're attempting to perform a analysis using a non-linear hyperelestic material (similar to santoprene) using Creo 3.0 M070. We have the engineering stress strain data for import, but I've received conflicting reports on which stress-strain data should be used. A previous thread mentioned it needed to be the true stress-strain, but when the data is imported, it labels the axis as engineering stress-strain (see attached). This is a bit of a rudimentary question, but I haven't found a definitive answer. Any guidance that could be provided would be greatly appreciated.
We've tried running the analysis using both, but have failed to converge. The error messages are a bit vague, so it's taking us a little bit of time to diagnose the problem. We've reduced the load greatly, and re-run the analysis using a material without the imported data, and is resolves fine. We believe the issue is with the material or with something else we're missing.