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On Nov 14, 2008, at 7:29 PM, Acharya, Suresh wrote:

Back to the stress vs. force discussion, the strength of materials (?) book by Byars, Snyder and Plants in the failure theory section or similar chapter (which I read about a decade ago), discusses why forces are better than stresses to define factor of safety or failure in real world structures. Some of the reasons being the effort to correlate the triaxial stress state
in a structural element to the material strengths that are measured in
uniaxial tests; other modes of failure (such as instability/shape) being
more critical; brittle or ductile classification of materials being
subjective and that often depending on temperature and other environmental
conditions, etc.
I think I'll stick to my guns.

Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw(--nospam--at)   | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania 1864)

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