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Time Integration and D1 material issues in PRF-3YP models set in earlier MCalibration release

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andcunsan
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Hi all

I am new user of MCalibration and  to polymer material modelling. Currently I would like to reproduce some results using already calibrated PRF models in the company. Such models were calibrated using an older MCalibration version 5.xx but company's version is  now 6.6. 

I am always facing the error below despite the  time integration increment size  I choose: "Error: dt < dtmin"

Current time step increment setup  is initial: 0.01s; Minimum: 1e-10s and Maximum :100s.  Time span is 10E5 s and it is related to a relaxation test. Solver is MCalibration.  Issue still persists if I use whether “Follow the same time increments as specified in the experimental data file” or “Specify the minimum number of time increments” options.

The only way I found to have some rough predicted data is to change "D1" parameter to zero. In release 5.xx  MCalibration asked for "kappa" among PRF-3YP parameters  but  I realize it  already converts kappa to  D1 when I open  the old version file in the new 6.6 release.  Since D1 is related to material bulk modulus I can't just change it blindly so as to  have a result.

This time integration increment issue is puzzling me taking into account that model used to work fine in earlier version. Does anybody have any piece of advice to share with?

Thanks

Anderson

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