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[Jan Stránský <question313437@xxxxxxxxxxxxxxxxxxxxx>]

Question #313437 on Yade changed:
https://answers.launchpad.net/yade/+question/313437

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,
have a look at [1]
3x3 matrix is a matrix representation of stress tensor
((mxx,mxy,mxz),(myx,myy,myz),(mzx,mzy,mzz)), which is possibly not symmetric
1x6 vector is Voigt notation (vxx,vyy,vzz,vyz,vzx,vxy), shear components
being average of tensor shear componetns, e.g. vxy=.5*(mxy+myx)
cheers
Jan

[1] https://en.wikipedia.org/wiki/Voigt_notation


2016-08-01 4:07 GMT+02:00 liukeqi <question313437@xxxxxxxxxxxxxxxxxxxxx>:

> Question #313437 on Yade changed:
> https://answers.launchpad.net/yade/+question/313437
>
> Description changed to:
>     I am not clear about the O.cell, for example, the relationship between
> the stress tensor matrix(3*3) obtaining from yade._utils.getStress and the
> stress vector(1*6) obtaining from Peri3dController(p3d.stress in the
> example), is there some simple references about it? And the stress tensor
> is not symmetric matrix, the xy do not equal to yx?
>     Can you give me some suggestions? Thank you.
>
> Keqi
>
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