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On Jan 15, 2006, at 12:32 AM, ASC wrote:

The question on how to convert a given, multiaxial
state of stress to the equivalent uniaxial one is quite old.
I'll quibble with this a little bit--you're not converting anything using the von Mises equivalent stress. What you're doing is applying a failure criterion based on a theory of failure. There are a number of them, each based on the supposition that failure occurs when some quantity, maximum principal stress, maximum shear, the strain energy, what ever, reaches a limiting value. The von Mises criterion for failure is based on strain energy of distortion. All this stuff comes from sophomore strength of materials, which shows how the various criteria provide a combined value to be compared with the material yield strength obtained from a uniaxial test.

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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