E-Z question about Von Mises stress

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 September 8, 1999, 08:57 E-Z question about Von Mises stress #1 Andrew Epp Guest   Posts: n/a Hello peers. Could someone please give me a simple definition of Von Mises stress and how it relates to shear and tensile stress? Thanks in advance. RAE

 September 8, 1999, 14:27 Re: E-Z question about Von Mises stress #2 Ken Light Guest   Posts: n/a 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.

 September 10, 1999, 12:45 Re: E-Z question about Von Mises stress #3 tom Guest   Posts: n/a 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 ?

 September 17, 1999, 02:11 Re: Von Mises and/or Navier-Stokes #5 tom Guest   Posts: n/a I think, beside the knowledge of another numerical area, the most important thing is to realize, what is possible in comfort. If you take ideas (cad and fem in one package) you see, what the future brings also to cfd. If you once worked with such a really professional program (prof. means: oriented at the customer !!!) you really wonder about software like pcube and even gambit and all the scientific people, that are sitting at their expensive workstations programming and editing and exporting and importing different files. In gambit you could not even measure distances !!!!!

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