Recently I have purchased MCalibration and PolyUMOD Library and did certain calibration work. In those work I realise that for same data set, for a certain material model, I obtain different material parameters when calibrating it at different occasions. But each will perfectly with with R2=0.999.
For example, if we have engineering stress vs strain data for a polymer; and calibrate with Bergstorm Boyce model ; at a certain instance I will get parameters of that model with R2=0.999 etc. (perfect calibration)
However when I test the same model again at different time, I will be able to match with Bergstrom Boyce model, but with different parameters of the same model.
The question is how can a model will get perfect calibration with different parameter combination at different try out.
In this situation, May I know how to know in which try I get the correct parameters.
This question really bothering me.....
Your aid will help me a lot in using the software more efficiently.