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 Andrew Epp September 8, 1999 08:57

E-Z question about Von Mises stress

Hello peers.

Could someone please give me a simple definition of Von Mises stress and how it relates to shear and tensile stress?

RAE

 Ken Light September 8, 1999 14:27

Re: E-Z question about Von Mises stress

From a structural mechanics point of view, the von Mises stress is a criteria used in predicting the onset of yield in ductile materials. It derives from the distortional energy density criterion which states that yielding begins when the distortional strain energy density at a point equals the distortional strain energy density at yield in uniaxial tension (or compression). The distortional strain energy is the energy associated with a change in the shape of a body. The calculated von Mises stress is a combination of principal and yield stresses. For a more detailed discussion try an advanced structures book like "Advanced Mechanics of Materials" by Boresi, Schmidt, Sidebottom.

I am not sure if this is what you were looking for, and depending on your background, it may not be an E-Z answer.

 tom September 10, 1999 12:45

Re: E-Z question about Von Mises stress

Hy,

that is an interresting subject. Did someone calculate the principal stresses and directions from cfd-results ? are the principal directions also rectangular or not ?

 John C. Chien September 11, 1999 00:34

Von Mises and/or Navier-Stokes