Re: [Yade-users] [Question #697545]: How to create a cylinder model with hard and soft interlayer
Question #697545 on Yade changed: https://answers.launchpad.net/yade/+question/697545 Liu Changdong posted a new comment: Hi Jan： I'm sorry I didn't make my question clear. My question is as follows: 1. How to select particles representing soft rock (different thickness and dip angle). 2.About changing the material, can i use the following method: sofeMat=O.materials.append(JCFpmMat()) hardMat=O.materials.append(JCFpmMat()) pred=pack.inCylinder() sp=pack.randomDensePack(pred,...) sp.toSimulation() 'select the soft rock particles' for i in 'softrock': O.bodies[i].mat.cohesion=softMat.cohesion Thanks changdong Liu -- 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 #697545]: How to create a cylinder model with hard and soft interlayer
Question #697545 on Yade changed: https://answers.launchpad.net/yade/+question/697545 Status: Open => Answered Jan Stránský proposed the following answer: Hello, a general approach: - create "uniform" cylinder - select "different" (harder or softer) particles - change their material > But i do not know how to do that To get more detailed answer, please read [1] and provide more detailed information what is the actual problem - what you do not know (already creating the cylinder? selecting particles? changing material? ... ?), if you already tried something etc. Cheers Jan [1] https://www.yade-dem.org/wiki/Howtoask -- 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 #697548]: Simulating the time-dependent behavior of single grain
Question #697548 on Yade changed: https://answers.launchpad.net/yade/+question/697548 Status: Open => Needs information Jan Stránský requested more information: Hello, > I'm a new user in Yade welcome :-) please read [1] and provide more information about your problem and simulation: - what is "time-dependent behavior or creep analysis or aging"? "just" dynamics? Short-time viscosity? long-term aging of concrete? ... ? - what is "single grain"? single physical real grain? single Yade particle? - behavior between ... grains - single grains? grains? more information needed :-) > Is there a contact model to know the time-dependent behavior again, more information is needed. Generally speaking, any Yade contact model describes time-dependent behavior. Cheers Jan [1] https://www.yade-dem.org/wiki/Howtoask -- 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 #697550]: Coefficient of friction between two different materials
Question #697550 on Yade changed: https://answers.launchpad.net/yade/+question/697550 Status: Open => Answered Jan Stránský proposed the following answer: Hello, > I am new to DEM simulations welcome :-) > which values does yade take generally speaking, it may be different for different materials, different contact laws etc. General "philosophy": - Material (e.g. FrictMat) stores properties of material = material properties of particle - IPhys stores properties of interaction = material properties of interaction - Ip2 defines, how IPhys properties are computed from Material See [1] for more information. Note that "material properties of particle" and "material properties of interaction" may be (usually are not, but may be) very different things. E.g. for FrictMat and FrictPhys: - FrictMat has frictionAngle property - FrictPhys has tangensOfFrictionAngle property - Ip2_FrictMat_FrictMat_FrictPhys has frictAngle property For the case of FrictMat and Ip2_FrictMat_FrictMat_FrictPhys, by default Ip2_FrictMat_FrictMat_FrictPhys() # no arguments takes a minimum value of the two friction angles. However, you can define a MatchMaker [2] to fit your needs and e.g. take average or maximum value: Ip2_FrictMat_FrictMat_FrictPhys( frictAngle=MatchMaker(...) ) To get this information, you can: - read documentation [3] - build a simple scene (1 sphere, 1 wall, 1 predefined contact) and test yourself - ask a question here - read source code [4] Roughly ordered by preference, but it may differ. E.g. for beginners, it is ok to ask very basic things here before they learn how to use and search documentation. Advanced users / developers may prefer reading source code. Cheers Jan [1] https://yade-dem.org/doc/user.html#functors-choice [2] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.MatchMaker [3] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.Ip2_FrictMat_FrictMat_FrictPhys.frictAngle [4] https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/dem/FrictPhys.cpp#L39 -- 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
[Yade-users] [Question #697550]: Coefficient of friction between two different materials
New question #697550 on Yade: https://answers.launchpad.net/yade/+question/697550 Hi I am new to DEM simulations In FrictMat() we define friction angle for let says a sphere and some different material is assigned for the wall which values does yade take when calculating friction forces between wall and spheres -- 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
[Yade-users] [Question #697548]: Simulating the time-dependent behavior of single grain
New question #697548 on Yade: https://answers.launchpad.net/yade/+question/697548 Dear all users, I'm a new user in Yade. I would like to simulate the time-dependent behavior or creep analysis or aging of single grain in Yade. Is there a contact model to know the time-dependent behavior between contact grains for non-cohesive or cohesive materials? Thank you so much for your help. -- 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 #697526]: CHOLMOD warning: matrix not positive definite
Question #697526 on Yade changed: https://answers.launchpad.net/yade/+question/697526 Zhicheng Gao posted a new comment: Can anyone provide some help, thank you very much！ -- 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
[Yade-users] [Question #697545]: How to create a cylinder model with hard and soft interlayer
New question #697545 on Yade: https://answers.launchpad.net/yade/+question/697545 Hi everyone: I want to creat a model with hard and soft interlayer like paper [1] Fig 4 . But i do not know how to do that. Can someone help me solve this problem. Best changdong Liu [1] https://www.researchgate.net/publication/338102898_Numerical_simulation_of_uniaxial_compression_tests_on_layered_rock_specimens_using_the_discrete_element_method -- 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 #697313]: Facing problem in stabilizing the DEM simulation sample when using Hertz-mindlin contact model
Question #697313 on Yade changed: https://answers.launchpad.net/yade/+question/697313 Status: Expired => Open Sarath Chandra Reddy is still having a problem: Thank you Jan for the reply. >please be more specific [1]. Do you get errors? Does it take too much time? >The target cannot be reached? ... ? I am not getting any error but the unbalanced force and mean stress are not reaching equilibrium even after long time (say even after few days). >when I am using Hertz-mindlin contact model - with other model(s) it is ok or not? (like why you mention explicitly "using Hertz-Mindlin model"). I think this especially when I am using Hertz-Mindlin model as I only changed small things in original code of Dr.Bruno (mainly about the contact model). Please give your advice/suggestions on any measures to be taken to attain stability quickly. best wishes Sarath -- 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 #696480]: PFacet model - contact data mining
Question #696480 on Yade changed: https://answers.launchpad.net/yade/+question/696480 Status: Open => Expired Launchpad Janitor expired the question: This question was expired because it remained in the 'Open' state without activity for the last 15 days. -- 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
