
From:  Konstantinos Poulios 
Subject:  Re: [Getfemusers] How to calculate pressure/stress tensor from displacement in linear elasticity problems 
Date:  Thu, 26 Jan 2017 09:07:23 +0100 
Dear Yves,Thanks a lot for your reply. I am not sure what you mean there. I have gone through the example and they calculate Von Mises Stress but there is already a function for that. Could you please tell me which physical quantity or _expression_ is being interpolated in that example so that I can use it as a basis for my pressure calculation. It would be really helpful if you would elaborate a bit on the usage and the example for calculating any _expression_ as I am quite new to fem and getfem. Thanks a lot.Yours sincerely
SamyakOn Wed, Jan 25, 2017 at 6:44 PM, Yves Renard <address@hidden> wrote:
Dear Samyak,
There is no specific function for that, but you can use the interpolation facilities of the model object. You can see an example of use for instance in the demo_thermo_elasticity_electrical_coupling example which has a python, Matlab, Scilab and C++ version. You can interpolate any _expression_. Be aware that the stress being discontinuous across the element edges/faces, the value will be averaged.
Regards,
Yves
Le 25/01/2017 à 06:08, samyak jain a écrit :
Dear getfemusers,
I have started using getfem recently to work on few contact problems between elastic bodies.
I am able to solve few simple cases and I am able to compute displacement (u) and VonMises/Tresca values on my mesh nodes.
The problem I am facing is that I have to calculate pressure at the mesh points and for that I believe I need the stress tensor values at these discrete mesh points. Could someone please guide me or tell me how to get the value of these variables. I went through the documentation and checked everywhere but I couldn't find a way to calculate stress tensor/pressure.
Thanks a lot.
Samyak
_______________________________________________ Getfemusers mailing list address@hidden https://mail.gna.org/listinfo/ getfemusers
 Yves Renard (address@hidden) tel : (33) 04.72.43.87.08 Pole de Mathematiques, INSALyon fax : (33) 04.72.43.85.29 20, rue Albert Einstein 69621 Villeurbanne Cedex, FRANCE http://math.univlyon1.fr/~renard 
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