# Units of Parameters

Hi, I am bit confused about the units of following parameters when simulating in graphical interface (generate and simulate). Can some body tell me in which unit these parameters should be input?

Particle radius (radiusMean), Box dimensions (lower and upper corner), stresses (sigmaIso and sigmalateral).

Also if a triaxial shear test is needed under strain controlled manner, how the loading is input to the simulation?

thank you.

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Bruno Chareyre
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 Revision history for this message Bruno Chareyre (bruno-chareyre) said on 2011-09-08: #1

A computer code has no unit. It is up to you to decide what is the unit
of numbers you input.
Of course, you have to be consistent: if the radius of particles is in
meters, then the size of the box should be in meters as well.
If you prefer inch and you define forces in tons, then the stress should
be in tons per squared inch. And so on.

For strain controlled test, I will try and commit example scripts
shortly. Ring me if you don't see them coming in the next days.

Bruno

 Revision history for this message Gayanindika (wanasinghegi) said on 2011-09-09: #2

Thanks Mr.Bruno,

Say the linear dimensions are in meters and if I need to apply a pressure of 100kPa, is the sigmaIso is 100,000 ?
Or, do I need to calculate the load in Newton?
I think it is pressure (not load).

Thank you

 Revision history for this message Bruno Chareyre (bruno-chareyre) said on 2011-09-09: #3

> Say the linear dimensions are in meters and if I need to apply a pressure of 100kPa, is the sigmaIso is 100,000 ?
I don't know really. What is the unit of your mass density?

 Revision history for this message Gayanindika (wanasinghegi) said on 2011-09-09: #4

mass density in kg/m^2

 Revision history for this message Gayanindika (wanasinghegi) said on 2011-09-09: #5

Sorry for the mistake. It should be kg/m^3.

 Revision history for this message Bruno Chareyre (bruno-chareyre) said on 2011-09-09: #6

You meant kg/m^3 I guess.
So yes, stress and stifness should be in Pa (assuming you define time in
seconds...).

 Revision history for this message Gayanindika (wanasinghegi) said on 2011-09-10: #7

Thanks Mr. Bruno. Hope you will upload about the triaxial shear test

 Revision history for this message Gayanindika (wanasinghegi) said on 2011-09-10: #8

Thanks Chareyre, that solved my question.

 Revision history for this message Bruno Chareyre (bruno-chareyre) said on 2011-09-14: #9

I just commited some tutorial exercises for the triaxial tests.
You can download them simply by typing "bzr update", or if you use the
packaged version of yade you can browse them online here:
I hope it helps.

 Revision history for this message Akhila Manne (manneakhila-civil) said on 2013-04-17: #10

Hi, i am not sure why the above link says the resource is not found..Could you plz let me know.

 Revision history for this message Christian Jakob (jakob-ifgt) said on 2013-04-17: #11

There were some changes since 2011 ...

triax-tutorial can be found here:

regards,

christian

 Revision history for this message Akhila Manne (manneakhila-civil) said on 2013-04-17: #12

Jakob
Thank u.
I am novice to yade and I would like to know how to apply dynamic stress
(goal) along a specific axis in PeriTriaxController Engine.

On Wed, Apr 17, 2013 at 12:01 PM, Christian Jakob <

> Question #170564 on Yade changed:
>
> Christian Jakob posted a new comment:
> There were some changes since 2011 ...
>
> triax-tutorial can be found here:
>
>
> regards,
>
> christian
>
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