I tried to work on the example on this thread https://forum.freecadweb.org/viewtopic.php?t=20238
in which the pin support on the both ends was transformed to cylindrical coordinate system, and the radial displacement is suppressed.
After the analysis, the result of the deformation seems a little strange. The shape of the pin holes remains circles, but it is deformation in the radial direction (the holes become larger).
Did I do anything wrong ? Or this is just the numerical error that cause it looks like the holes are enlarging ?