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Re: About the moment calculation in cohesion-friction model



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.


At 2010-09-16 19:32:15,"Jerome Duriez" <duriez@xxxxxxxxxxxxxxx> wrote:

>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.
>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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