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

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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August 11, 2010 6:26am UTC in response to Ivar Kjelberg

Re: boundary integration in podtprocessing

Hi Ivar:

I am having a similar issue, I was wondering if you can help me. I am modeling the insertion of a probe into the a cube. The probe I am having in post processing is that using point evaluation on vertices or boundary integration on the probe boundaries, the reaction force is always zero (in the z-direction of insertion).

I am looking for the resistance force that the probe is experiencing during the insertion - this is the reaction force right?
Also, for those points on the surface of the cube that are not part of the geometry, I cannot do point evaluation of any parameters on those points, any idea why?

I am attaching a simple version of this simulation.

Thank you,

Joe

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