Re: [Yade-users] [Question #403469]: How to set the damping coefficient of a crowd of powders

2016-10-25 Thread Yufan Zhao
Question #403469 on Yade changed: https://answers.launchpad.net/yade/+question/403469 Status: Answered => Open Yufan Zhao is still having a problem: Bruno, thank you very much. But I don't know your meaning that there is no physical damping clearly. "kinetic energy of particles needs to be

Re: [Yade-users] [Question #403470]: fatigue failure under cyclic loading using CPM

2016-10-25 Thread Weimin Song
Question #403470 on Yade changed: https://answers.launchpad.net/yade/+question/403470 Status: Answered => Solved Weimin Song confirmed that the question is solved: Thanks Jan Stránský, that solved my question. -- You received this question notification because your team yade-users is an

Re: [Yade-users] [Question #403470]: fatigue failure under cyclic loading using CPM

2016-10-25 Thread Jan Stránský
Question #403470 on Yade changed: https://answers.launchpad.net/yade/+question/403470 Jan Stránský proposed the following answer: In this case, just try some "normal" simulation, get the length of time step, how much real time does it take to compute it and extrapolate how much would 1 cycles

Re: [Yade-users] [Question #403470]: fatigue failure under cyclic loading using CPM

2016-10-25 Thread Weimin Song
Question #403470 on Yade changed: https://answers.launchpad.net/yade/+question/403470 Weimin Song posted a new comment: Thank you, Jan. The cycles may be above 1 times. -- You received this question notification because your team yade-users is an answer contact for Yade.

Re: [Yade-users] [Question #403339]: Interactions in a clump

2016-10-25 Thread Jérôme Duriez
Question #403339 on Yade changed: https://answers.launchpad.net/yade/+question/403339 Status: Open => Answered Jérôme Duriez proposed the following answer: In my opinion it makes little sense (no offense ;-) ) to speak of forces outside of interactions in DEM in general / Yade in

Re: [Yade-users] [Question #403470]: fatigue failure under cyclic loading using CPM

2016-10-25 Thread Jan Stránský
Question #403470 on Yade changed: https://answers.launchpad.net/yade/+question/403470 Status: Open => Answered Jan Stránský proposed the following answer: Hello, I have no experience with this kind of simulations and **in my opinion** DEM is not the best approach.. What number of cycles

Re: [Yade-users] [Question #403385]: Micro and Macro relation in CPM pararmeters

2016-10-25 Thread Jan Stránský
Question #403385 on Yade changed: https://answers.launchpad.net/yade/+question/403385 Jan Stránský proposed the following answer: Hi Mohsen, please really provide a MWE :-) it would be much easier to determine the source of problem.. First some explanation why the equivalence of micro and macro

Re: [Yade-users] [Question #403339]: Interactions in a clump

2016-10-25 Thread bruna
Question #403339 on Yade changed: https://answers.launchpad.net/yade/+question/403339 Status: Answered => Open bruna is still having a problem: Jerome, thank you for the clarifications. I still have a question in this subject. Does the same that happens with the interactions happen with

Re: [Yade-users] [Question #403385]: Micro and Macro relation in CPM pararmeters

2016-10-25 Thread Bruno Chareyre
Question #403385 on Yade changed: https://answers.launchpad.net/yade/+question/403385 Bruno Chareyre proposed the following answer: Actually no, the micro-macro relations can always be put in a way such that they do NOT depend on particle sizes. In Yade, at least, it is the case (and it is

[Yade-users] [Question #403470]: fatigue failure under cyclic loading using CPM

2016-10-25 Thread Weimin Song
New question #403470 on Yade: https://answers.launchpad.net/yade/+question/403470 Dear all, Does anyone do the research of the fatigue failure of concrete using CPM under cyclic loading, such as compression or tension load? Or is it available using CPM or other material types in

Re: [Yade-users] [Question #403469]: How to set the damping coefficient of a crowd of powders

2016-10-25 Thread Bruno Chareyre
Question #403469 on Yade changed: https://answers.launchpad.net/yade/+question/403469 Bruno Chareyre posted a new comment: I meant to make damping zero after the initial deposit is stable. If yo umake it zero from the beginning the gravitational deposition will take ages. -- You received this

Re: [Yade-users] [Question #403469]: How to set the damping coefficient of a crowd of powders

2016-10-25 Thread Bruno Chareyre
Question #403469 on Yade changed: https://answers.launchpad.net/yade/+question/403469 Status: Open => Answered Bruno Chareyre proposed the following answer: Hi, I would suggest to make Newton's damping 0 in such case, since it is not a physical damping. The question is if you need damping

[Yade-users] [Question #403469]: How to set the damping coefficient of a crowd of powders

2016-10-25 Thread Yufan Zhao
New question #403469 on Yade: https://answers.launchpad.net/yade/+question/403469 Hello everyone, I have a problem in setting the damping coefficient of powders. Could any one teach me how to determine this parameter. My simulation is setting a cloud of metal powders which are settled down on

Re: [Yade-users] [Question #403426]: how to compute the shear strain

2016-10-25 Thread Bruno Chareyre
Question #403426 on Yade changed: https://answers.launchpad.net/yade/+question/403426 Bruno Chareyre posted a new comment: I forgot a multiplication by △t in the above equations. Let "v" be the rotation increment equal to spin times △t and the equations are correct. -- You received this

Re: [Yade-users] [Question #403385]: Micro and Macro relation in CPM pararmeters

2016-10-25 Thread Bruno Chareyre
Question #403385 on Yade changed: https://answers.launchpad.net/yade/+question/403385 Bruno Chareyre proposed the following answer: Hi, Short answer: There is indeed no simple relationship between ks/kn and the material parameter called Poisson, but a dependency does exist (with both the solid

Re: [Yade-users] [Question #403426]: how to compute the shear strain

2016-10-25 Thread Bruno Chareyre
Question #403426 on Yade changed: https://answers.launchpad.net/yade/+question/403426 Status: Open => Answered Bruno Chareyre proposed the following answer: Hi, I understand the meaning my not be immediate but it is actually relatively simple. Let w be the spin vector of the grain pair.

Re: [Yade-users] [Question #403385]: Micro and Macro relation in CPM pararmeters

2016-10-25 Thread mohsen
Question #403385 on Yade changed: https://answers.launchpad.net/yade/+question/403385 mohsen posted a new comment: Jan There is another point that i forgot: why in CPM material the ratio of ks/kn is called Poisson ration? That is clear by increasing ks/kt (or inter particle nu), macro nu

Re: [Yade-users] [Question #403385]: Micro and Macro relation in CPM pararmeters

2016-10-25 Thread mohsen
Question #403385 on Yade changed: https://answers.launchpad.net/yade/+question/403385 mohsen posted a new comment: Hi Jan >could you please provide a MWE (how you evaluate "determined" and >"computed" E and nu ). E and nu are the parameters which CPM material needs. Hence the phrases 'inter