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[Hongyang Alex Cheng <question264174@xxxxxxxxxxxxxxxxxxxxx>]

Question #264174 on Yade changed:
https://answers.launchpad.net/yade/+question/264174

Hongyang Alex Cheng proposed the following answer:
Hi, Shenyang

Like Bruno said. you should take a look at the functors you use. The
contact springs are defined by the law2 and the Ip2 functors. The meaning
of Young's modulus and poisson ratio varies from different set of law2 and
lp2 functors in use (see linear contact and mindlin contact for instance).
If you use the linear contact law changing poisson ratio will only affect
the shear stiffness. Note that adjusting material constants doesn't have
effect on existing contacts.

Alex

On Fri, Mar 27, 2015 at 10:41 AM, Shenyang Cai <
question264174@xxxxxxxxxxxxxxxxxxxxx> wrote:

> Question #264174 on Yade changed:
> https://answers.launchpad.net/yade/+question/264174
>
> Shenyang Cai posted a new comment:
> Hi Bruno,
>
> I'm still confused.  When two spheres are in contact, I suppose there
> must be a normal stifness and a shear stiffness(though it may equal
> zero) between them, regardless of the IPhys and Law functors.
>
> My idea is to change some parameters in the material class to enlarge
> the shear stiffness between the spheres. And I thought "poisson" is a
> factor. If changing "poisson" does not lead to the change of shear
> stiffness,  then what paremeters should I focus on to achieve my goal?
>
>
> Thanks!
> Shenyang
>
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