yade-users team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

Aditional remark : the TriaxialTest can generate the packing THEN 
perform compression/traction test. You don't need to save/reload the 
simulation.

Bruno


SHIU wenjie a écrit :
> Hi Vaclav,
>
> I did get some pre-generated numerical specimens for uniaxial test and 
> triaxial test. I can send you some files later!!! Or you can even make the 
> specimen by yourself! I can explain the way that i use to do the "specimen 
> generation".
>
> I take the Triaxialtest as an example base, i just add some changes in this 
> class.
> You can start from the radii expansion process to get a sphere assembly with 
> isotropic property. When the stability criteria is satisfied, saving the 
> position and the radius of all the spheres. And the specimen generation is 
> done!! Be care about the ratio between the stiffness of the spheres and the 
> target confinement.
>
>
> How many spheres should we use?? Well, you can take 10000 spheres if you get 
> a powerful PC. Indeed, i did some uniaxial simulations, and i did not get 
> the size effect (between 2400 to 8000 spheres)!!
>
> And the problem about the dilatance when runing the triaxial test, I am 
> still trying to find out a solution!! It could be caused by the constitutive 
> law or many other factors!!!
>
> Regards
>
> wenjie
>
> ----- Original Message ----- 
> From: "Václav Smilauer" <eudoxos@xxxxxxxx>
> To: <yade-users@xxxxxxxxxxxxxxxx>
> Sent: Wednesday, November 28, 2007 1:21 PM
> Subject: [Yade-users] reference sphere assembly
>
>
>   
>> I would like to calibrate material parameters to match macroscopic
>> properties using uniaxial traction and later triaxial compression tests.
>> Is there some widely used, pre-generated sphere assmebly that has
>> properties such as isotropy and "reasonable" radii variance that could
>> be used? (Something like that should be part of Yade, I think).
>>
>> If no, what procedures to you recommend to create such assembly? How
>> many sphere should I go for?
>>
>> I will work soon on triax test which will have "true" hydrostatic
>> confinement (by using delaunay to detect the solid edge and applying
>> forces at relevant spheres) - that will solve the problem of restricted
>> dilatance for triax (right, Wenjie?).
>>
>> Regards, Vaclav
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>>     
>
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>   


-- 
 
_______________
Chareyre Bruno
Maitre de conference

Institut National Polytechnique de Grenoble
Laboratoire 3S (Soils Solids Structures) - bureau E145
BP 53 - 38041, Grenoble cedex 9 - France
Tél : 33 4 56 52 86 21
Fax : 33 4 76 82 70 00
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