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boundary integration in podtprocessing

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Alex Zinchenko

Alex Zinchenko

March 10, 2010 4:14pm UTC

boundary integration in podtprocessing

Dear all,

I have a simple question about comression simulation.

I have a cube in mechanical module.
I applied a prescribed displacement(in -y direction)as a boundary settings for upper boundary.
bottom boundary is fixed.

In Postprocessing/boundary integration I clicked on upper boundary and chose reaction force in y direction.

This reaction force has negative value!!!!!!!

How it can be that I press on cube and cube's reaction force is negative?

Thanks in advance,
Alex

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Ivar K

Ivar K
Moderator

March 14, 2010 5:24pm UTC in response to Alex Zinchenko

Re: boundary integration in podtprocessing

Hi

I would expect that the reaction force sign is defined with respect to the surface normal = direction pointing "outwards" of the volume.

Therefore I find the signs rather coherent that way, but I agree it's a convention issue

Do you agree ?

Good luck
Ivar

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Alex Zinchenko

Alex Zinchenko

March 15, 2010 10:18am UTC in response to Ivar K

Re: boundary integration in podtprocessing

Hi Ivar,

of course it is but the problem is that in my case it works only in x and z directions.
It should be that reaction force directed according axes but this rule works only in x and z directions...
in y direction(where my prescribed displacement applied) it works in opposite way...

Thank you in advance,
Alex

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