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[mohsen <question295810@xxxxxxxxxxxxxxxxxxxxx>]

New question #295810 on Yade:
https://answers.launchpad.net/yade/+question/295810

In the name of god
Hello every one

On 2016-04-10 i asked a question (No 290372) about stiffness computation in CPM model and finally this question results in definition of a new method in "Ip2_CpmMat_CpmMat_CpmPhys". This new method (E(=uninitalized)) enable the user to define contact stiffness in 4 algorithm. 
 Now there is two points:
1- What about friction angle?! Suppose that the friction angle of two different materials (phi1 and phi2) has been obtained experimentally and there is a great difference between the obtained value and what  Ip2_CpmMat_CpmMat_CpmPhys computes i.e. using average of the two friction angle ((phi1+phi2)/2).  How can we use real  friction angle instead of average one?

2- Why the user is forced to choose one of the 4 algorithms? Is it possible to inter the interaction young modulus manually (As i think it is so in PFC)? Or a better approach is to develop 'algo' method of class  'MatchMaker' [1] in such a way that two coefficient is defined (e.g.  C1 and C2). Then interaction young modulus and friction angle can obtained :

E=(C1* E1+C2*E2)/(C1+C2)
friction angle= (C1* phi1+C2*phi2)/(C1+C2)


Thanks

[1]: https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.MatchMaker

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