How to get the fluid pressure at the centroids is assigned? 1

[sabriuzuner]

I am studying analysis of soil consolidation to fluid pressure in tissue. I would like to get a similar plot with the figure follows (the fıgure adopted from literature [1]).
I mean that how can I obtain max. fluid pressure in any tissue of my model as a function time. I believe that output variable named "POR" represent fluid pressure. The issue that if I select "Unique Nodal" as follows picture, I can pick POR variable. But, when I select centroid as position, I can not see POR variable to click. But however, It writes in the literature that max fluid pressure was obtained from the centroids of elements which were approximately at 1/4 depth from the articular surface. (please see relevant figure in below)
How is that possible?

By the way, I'm an user of ABAQUS.


1) Kazemi, M., & Li, L. P. (2014). A viscoelastic poromechanical model of the knee joint in large compression. Medical engineering & physics, 36(8), 998-1006.

 

[FEA way]

According to the documentation, POR is a nodal variable and thus can be plotted for nodes only. Apparently authors of this paper used another output variable to plot pressure at centroids. Search history output request menu for possible options.

 

[Mustaine3]

For Pore Pressure analysis the variable POR is an integration point variable. See documentation. So it is possible with '*Node Output, Position=' to request the data written at centroid position.

 

[sabriuzuner]

Thanks all for reply.

Dear Mustaine3, Could you elaborate this method "*Node Output, Position=' to request the data written at centroid position." ? For example, How can I get label of centroid position I interested and relate the centroid position to the POR value? Just know that is I should do this in ".inp file" ?

Thanks!

 

[Mustaine3]

Write out the input file from A/CAE, add the keyword commands in the input file and submit the analysis (.inp) via a command line.
Or use the Keyword Editor within A/CAE to add the commands.

Depending on your situation, the keywords to add may look like this:

*Output, field
*Element Output, Position=Centroidal
POR

In Postprocessing you can then use the GUI you've showed above to create xy-data of specific elements with these data.
Or you can directly request history output for specific elements in the input file. But that would mean, that you know in advance the element sets or element label that you want to investigate.