Hi John,
I think you could use some variation on "open cylindrical shell
segment". A Google (Book) Search for this should locate page 137 with
an illustration in
_Hybrid and Incompatible Finite Element Methods_ by Theodore H. H.
Pian and Chang-Chun Wu.
Sorry that it is not one or two words as you wished, but you can
refer to it as "segment" in subsequent discussion.
In your definitions of sector and segment you may wish to substitute
"disk" for "circle".
A mechanical engineering handbook may have some of the future shapes you need.
Gordon Uber
San Diego
At 07:25 PM 10/14/2006, John Pickard wrote:
Good afternoon everyone,
This is a bit off-topic, but given the range of expertise available
on the Sundial List, I think I can get an answer ...
I need names for some geometric shapes for some research I am doing.
Two are not a problem:
Sector: a part of a circle bounded by the circumference and two
radii meeting at the centre of the circle.
Segment: a part of a circle bounded by the circumference and a chord.
But is there a simple one- or two-word name for a piece of a pipe?
Imagine a pipe cut lengthwise with two radial cuts to give a long
piece which in cross section is bounded by two arcs, joined by the
radii. Is there a formal name for this shape? It's only the
two-dimensional shape that interests me, i.e. the cross-section of
the bit cut lengthwise out of the imaginary pipe. I guess it could
be a "pipe sector" , but this doesn't sound very mathematical!
More generally, does anyone know of a web source with diagrams of
numerous geometric shapes and their names? I think I will have a few
more odd cross-sections come up in the next few months, and I will
need names for them.
Cheers, John
John Pickard
<mailto:[EMAIL PROTECTED]>[EMAIL PROTECTED]
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