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[Aleksander Grabowski <question689592@xxxxxxxxxxxxxxxxxxxxx>]

Question #689592 on Yade changed:
https://answers.launchpad.net/yade/+question/689592

Aleksander Grabowski posted a new comment:
Hi Leonard,

like you said, it is difficult to create one set of parameters that will
provide proper results for different conditions.

In my work, I used TriaxialCompressionEngine to perform some triaxial tests. As far as I'm concerned, when I wanted to properly prepare samples for two different confining pressures e.g. 100 kPa and 400 kPa, I had to use different friction angles between the particles (higher one for higher pressure), so the initial porosity was equal for both pressures (higher pressure will better squeeze
the specimen). I used the same approach to reach different initial porosities. 

As far as I know, you can try to change your parameters a little, e.g.:
- increasing micro friction angle will increase only the peak value of the stress-strain curve and the residual value will stay on the same level,
- increasing young modulus will increase the global stiffness of the response.
- changing moments law etaRoll parameter can change the placement of the peak value on the stress-strain curve.

Cheers, 
Aleksander

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