yade-users team mailing list archive

[luc scholtes <lscholtes63@xxxxxxxxx>]

Hi,

Sorry, I don't really get the point... I will try to answer since I think
you get confused with Cpm which is different to CFpm:

Contrary to Cpm, CohesiveFrictionalPM needs to be used with ScGeom as
precised in the functor name(Law2_ScGeom_CFpmPhys_CohesiveFrictionalPM). In
this manner, you can therefore use CohesiveFrictionalPM with
ThreeDTriaxialEngine as long as you define boxes as boundaries (actually, I
am using it right now :-) ). Just use: Ig2_Sphere_Sphere_ScGeom and
Ig2_Box_Sphere_ScGeom in your simulation, it should work.

Hope it helps.

  Luc

2010/9/17 焦利青 <jiaoliqing@xxxxxxx>

> Hello,
>
> Thanks for your warm help. I have tried this model. However, the new
> problem is coming. You know, the CFphPhys just can be matched to
> Dem3DofGeom. There are no the Ig2_Box_Sphere_Dem3DofGeom. If I must choose
> the Ig2_Facet_Sphere_Dem3DofGeom instead of Ig2_Box_Sphere_Dem3DofGeom. then
> the ThreeDTriaxialEngine can not approve the Facet as the boundary. If I
> want to change Facet instead of the box in ThreeDTriaxialEngine, I cannot
> give the only one Facet id to impose the strain on it. You know, The
> rectangle should be composed of two facet.
> So, how can I deal with it? Thank you!
>
> Best
> Liqing
>
>
> At 2010-09-17 10:49:31，"luc scholtes" <lscholtes63@xxxxxxxxx> wrote:
>
> Try to have a look at CohesiveFrictionalPM with CFpmPhys and CFpmMat which
> allow cohesion, tensile strength and moment at contact.
>
> Cheers
>
>   Luc
>
> 2010/9/17 焦利青 <jiaoliqing@xxxxxxx>
>
>> Hello,
>>
>> Yes, you are all right. I mentioned the cohesion-friction model is
>> Law2_ScGeom_CohFrictPys_ElasticPlastic. I am sorry, I should point out
>> clearly. As your means, If I would like to consider the effect of moment,
>> this one is not suitable, isn't it? I know the code of moment algorithm has
>> been realized in the Cohesionless one. But, the effect of cohesion must be
>> considered in my model. In the conclusion, if both the moment and cohesion
>> should be considered, how can I do it? May I have your help? thank you.
>>
>> Sincerely
>> Liqing
>>
>>
>> At 2010-09-16 19:32:15，"Jerome Duriez" <duriez@xxxxxxxxxxxxxxx> wrote:
>>
>> >Hello,
>> >
>> >You can find this plastic threshold for the moment in
>> >Law2_ScGeom_NormalInelasticityPhys_NormalInelasticity (lines 193 to 202
>> >of the .cpp). For what concerns the "cohesion-friction model", I assume
>> >that you speak of Law2_ScGeom_CohFrictPhys_ElasticPlastic, which I know
>> >less. But a quick look to the .cpp gives me the same feeling than yours,
>> >that the moment is always elastic.
>> >
>> >Jerome
>> >
>> >Le 16/09/2010 12:40, 焦利青 a écrit :
>> >> Hello,
>> >>
>> >> I found the moment calculation in cohesion-friction model is different
>> >> from the traditional algorithm which is listed in the
>> >> paper(Jean-Patrick Plassiard etl, A spherical discrete element
>> >> model:calibration procedure and incremental response, 209; N. Belheine
>> >> etl, Numerial simulation of drained triaxial test using 3d discrete
>> >> element modeling; Rolling resistance at contacts in simulation of
>> >> shear band development by DEM). In the traditional algorithms, the
>> >> slider for rolling starts working if the moment exceeds a value of
>> >> "eta* Normal force". However, I cannot find the related code described
>> >> it. If no any condition to relax the moment. then the moment will act
>> >> all the time. I think it should be wrong. Maybe I haven't found the
>> >> right file. May I have your help? Thank you.
>> >>
>> >> Best
>> >> Liqing
>> >
>> >
>>
>>
>>
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