> If I use principal stresses they generally seem to come out lower
> than the
> von Mises so I'm conservative anyway.
The hooker is to judge whether the stress you're looking at tensile
or compressive. Glass does a much better job of handling compression
unless you're looking at buckling. But if you're talking about flat
panels compression and tension are equal, unless you're addressing a
flaw on the tension side.
Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw@skypoint.com | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania
1864)
http://www.skypoint.com/members/chrisw/
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