"you know less than people who know less than one percent of what there is to know
about Finite Element Analysis."
that's what i was told by my boss & mentor. the program i was using (Aries) only
had wedge-shaped elements for a pressure vessel analysis. (Aries was a solid
modeller to use for pre & post-processing for analysis. pre-processing means
you build a mesh; post-processing refers to the pretty multi-colored output.
in that case, Aries used ANSYS to do the analysis.)
as it turned out, in ANSYS, the analysis would have been done using planar elements,
which represent wedge-shaped elements. i used a "pie-shape", like a 15% wedge,
with boundary conditions applied to suit a vacuum pressure vessel. it was for one of
Applied Materials' plasma etch quartz pressure vessels in 1989.
anyway, when my boss saw me doing the analysis the wrong way, he got a little
upset. the next day he delivered the "you know less ..." speech.
as it turned out, there was no way to do a pressure vessel analysis using planar
elements.
i just sat there and thought, "you're paying me $X a day to listen to this. i can handle that".