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On Nov 14, 2008, at 12:46 PM, Acharya, Suresh wrote:

Question arises which stress you want to use a indicator? Principal stresses, Von Mises stress, or stresses based on several other hypothesis?

Not to beat this topic to death, but that question was answered in sophomore strength of materials--the chapter on failure theories. von Mises or maximum shear for ductile materials, maximum principle stress for materials like cast iron or for crack propagation. Every criterion depending on plastic flow has to be related to yield stress.

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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