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[Aaron Liu <question694492@xxxxxxxxxxxxxxxxxxxxx>]

Question #694492 on Yade changed:
https://answers.launchpad.net/yade/+question/694492

    Status: Answered => Open

Aaron Liu is still having a problem:
Hi Jan,

Thank you so much again for your complete answers.

>What does "soft" and "hard" exactly mean? Low and high stiffness? Low and high strength?
I mean the stiffness here. I see what you mean. We have many ways to represent and model the two-phase (particle and cement). 

If I would like to model the cement as the interaction between particles. And let stiffness under compression and tension are different. For example, two particles(E=1e10) are connected and their interaction tension stiffness is 1e4 Pa and compression stiffness is 1e8 pa.  
Since  1/(E1.D1)+1/(E2.D2) is used to define the normal stiffness as  (https://www.yade-dem.org/doc/yade.wrapper.html#yade.wrapper.Ip2_FrictMat_FrictMat_FrictPhys) described, and the normal stiffness no matter compression and tension is the same and has to be related to E of particles.  I am still wondering that is there any ways to define the stiffness of a pair of compression and tension differently and the stiffness is independent to E of particles. 

Best,
Aaron

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