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different strain rates not recognized

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Posts: 1
 roym
Topic starter
(@roym)
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Joined: 6 months ago

Hello, 

I am trying to calibrate a BB-model by using uniaxial cyclic load-unload data (loaded-unloaded for 8 times) at two different strain rates. The strain rates are 0.0008 and 0.0016 1/s. When I import this data into MCalibration, and try to calibrate a BB-model, I get a warning that I should use different strain rates to calibrate the BB-model. When I import that same data and I use 0.01 and 0.1 1/s for the strain rates (just to see if that makes a difference) I do not get this warning. It seems that the initial strain rates (which differ a factor of 2) are too close together to calibrate a BB-model?

Furthermore, I get several warnings that I use monotonic experimental data and that I therefore cannot use Mullins parameters. However, the data I provide is not monotonic loading data, but it consists of load-unload cycles that have been repeated for a total of 8 times. 

I have uploaded a figure of one of the two datasets I use. The other dataset is similar but differs in strain rate only.

 

Anybody can help with this?

 

Thanks.

Roy

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