Re: [Yade-users] [Question #665246]: elastic-perfectly plastic material
Question #665246 on Yade changed: https://answers.launchpad.net/yade/+question/665246 Status: Answered => Solved azim confirmed that the question is solved: Thanks Luc Scholtès, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #665246]: elastic-perfectly plastic material
Question #665246 on Yade changed: https://answers.launchpad.net/yade/+question/665246 azim posted a new comment: Dear all, Dear Jérôme, Bruno, Jan, Luc, Thank a lot for your kind responses and your valuable time. I have been busy working on my code which made me delayed to come back here. Luc, thanks for your notes on calibration; I guess that is exactly what I need. Let me try what you proposed. I will ask any question may arise during my calibration in a new thread. Thanks Azim. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #665246]: elastic-perfectly plastic material
Question #665246 on Yade changed: https://answers.launchpad.net/yade/+question/665246 Luc Scholtès proposed the following answer: Hi, My guess: You want to know how to relate the yielding stress of your material (e.g. deviation from linearity of the stress strain curve for a uniaxial compression test) with the interparticle properties of your contact model (e.g. cohesion and friction angle). If that's what you are after, you need to perform simulations on a particle packing (e.g. a triaxial compression) to see how the interparticle parameters (e.g. friction angle) affect the stress strain response of your material and thus its macromechanical properties (e.g. yielding stress). The relation between interparticle parameters and macromechanical properties is not direct in DEM (unless you use regular packings of particles). That's usually how we calibrate DEM model: trial and error to find the combination of interparticle parameters which gives the desired macromechanical properties. Of course, this micro- macro relationship is also a function of the packing structure (porosity, particle size distribution, homogeneity, etc...). Have a look at this article to get some ideas about the calibration procedure: https://link.springer.com/article/10.1007%2Fs10035-016-0687-0 I might be off topic though since your question is not very clear... Luc -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #665246]: elastic-perfectly plastic material
Question #665246 on Yade changed: https://answers.launchpad.net/yade/+question/665246 Jan Stránský proposed the following answer: Hi Azim, do you mean Fs,max = Fn * tan(phi) # [1] ? cheers Jan [1] https://yade- dem.org/doc/yade.wrapper.html#yade.wrapper.Law2_ScGeom_FrictPhys_CundallStrack -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #665246]: elastic-perfectly plastic material
Question #665246 on Yade changed: https://answers.launchpad.net/yade/+question/665246 Status: Open => Answered Bruno Chareyre proposed the following answer: Still unclear for me I'm sorry. Would you give a mathematical expression of the quantity you are after? -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #665246]: elastic-perfectly plastic material
Question #665246 on Yade changed: https://answers.launchpad.net/yade/+question/665246 Status: Answered => Open azim is still having a problem: for some stresses domains contacts are elastic. when we do load/unload the behavior is linear and returnable. but after a specific stress when we do unloading some strains remain as residual strain, (plastic strain) and the path of unloading differ from the elastic one. i want to know the relation between friction angle and stresses with plastic domain??? -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #665246]: elastic-perfectly plastic material
Question #665246 on Yade changed: https://answers.launchpad.net/yade/+question/665246 Status: Open => Answered Bruno Chareyre proposed the following answer: >Q) How do i know the point that my material yields in plastic domain? What does that mean? -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #665246]: elastic-perfectly plastic material
Question #665246 on Yade changed: https://answers.launchpad.net/yade/+question/665246 Status: Answered => Open azim is still having a problem: thank you both bruno and jerome, you are right.i checked it. it's elastic-perfectly plastic. i have another question if you please help me: Q) How do i know the point that my material yields in plastic domain? (friction angle or stress pattern) -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #665246]: elastic-perfectly plastic material
Question #665246 on Yade changed: https://answers.launchpad.net/yade/+question/665246 Status: Open => Answered Jérôme Duriez proposed the following answer: Hi, There may be some confusion here. 1. FrictMat's doc [*] says "Elastic material with contact friction", and I think "with contact friction" is as much important as "Elastic material" for a proper understanding of this material. The contact description usually obtained with FrictMat, through e.g. Ip2_FrictMat_FrictMat_FrictPhys and Law2_ScGeom_FrictPhys_CundallStrack, actually *is* elastic perfectly plastic in the tangential direction. 2. Generally speaking, I think the discussion would be simpler if you disregard for now constitutive relations for (volume) materials, and stick to contact laws expressing contact forces in terms of relative displacements between contacting particles. In this framework, which contact behavior would you like to describe ? Jerome [*] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.FrictMat -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #665246]: elastic-perfectly plastic material
Question #665246 on Yade changed: https://answers.launchpad.net/yade/+question/665246 Bruno Chareyre proposed the following answer: Hi, [1] is exactly elastic-perfectly plastic. Maybe your question is about an elastic-perfectly plastic _bulk behavior_, but bulk behavior is not an input parameter of DEM (hence answer #1). As far as I know it is very difficult to obtain such a bulk behavior with DEM. Regards Bruno -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
