# frictionAngle vs μ(interparticle friction coefficient)

Asked by jamespaul on 2019-02-13

Hi,

I have the frictional coefficient of some granular material, and how can I convert this to frictionAngle?(Contact friction angle (in radians))

For example,μ=0·235

My formula is: frictionAngle=radians(arctan(0.235))

Am i right?

Thanks

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2019-02-13
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2019-02-13
 Chareyre (bruno-chareyre-9) said on 2019-02-13: #1

I think you can try your equation on your side. Best way to learn.
B

Le mer. 13 févr. 2019 10:47, jamespaul <email address hidden>
a écrit :

> Question #678523 on Yade changed:
> https://answers.launchpad.net/yade/+question/678523
>
> Description changed to:
> Hi,
>
> I have the frictional coefficient of some granular material, and how can
> I convert this to frictionAngle?(Contact friction angle (in radians))
>
> For example,μ=0·235
>
> My formula is: frictionAngle=radians(arctan(0.235))
>
> Am i right?
>
> Thanks
>
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 Luc Scholtès (luc) said on 2019-02-14: #2

I agree with Bruno. Self validation is crucial in our "world". Just print the calculated value and compare it to the expected one :)

Also, be careful not to mix up the internal friction angle of a material and the interparticle friction angle. You may be surprised...

 jamespaul (jamespauljames) said on 2019-02-15: #3

Thanks Luc,

I'm recreating other people's papers.The author used open-source code Lammps.He used four parameters:shear modulus,particle Poisson’s ratio, particle density, interparticle friction coefficient.This should be the simplest material.I lack knowledge of physics.The result of my simulation is somewhat different from that of the paper. So I suspect I have a problem converting the Angle of friction.

I will really appreciate your concern.

James

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