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[Othman Sh <question685523@xxxxxxxxxxxxxxxxxxxxx>]

New question #685523 on Yade:
https://answers.launchpad.net/yade/+question/685523

Hello,

Regarding the CPM material model, would you please clarify the following:

1- From Yade documentation under the section: class yade.wrapper.Law2_ScGeom_CpmPhys_Cp :
epsSoft(=-3e-3, approximates confinement -20MPa precisely, -100MPa a little over, -200 and
-400 are OK (secant))
Strain at which softening in compression starts (non-negative to deactivate)

what is the difference between epsSoft and epsCrackOnset (in Yade its described as: limit elastic strain)? is epsCrackOnset is the elastic strain limit in tension only, while epsSoft is the elastic strain limit in compression?

2- relKnSoft is defined in Yade documentation  as "Relative rigidity of the softening branch in compression (0=perfect elastic-plastic, <0 softening, >0 hardening"

Is relKnSoft a factor to reduce the elastic modulus of the bond in compression?

3- In the CpmMat, is the parameter "young" corresponds to the elastic modulus in both tension and compression?

4- Suppose I compressed two spheres into eachother, based on the CPM model, the stress-strain relationship is linear elastic at the begining, then what will happend to the curve? is there a strain limit after which the bond will be damaged?

Thank you,
Othman

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