Von Mises
Von Mises
(OP)
Hi All,
I am preparing a excel sheet, where I have the results for an analysis. I have the stresses for Axial, Bend-Y, Bend-Z, Combined, Shear-Y and Shear-Z. What formula do I need to come up with for the von-Mises stress? Thanks in advance.
HD
I am preparing a excel sheet, where I have the results for an analysis. I have the stresses for Axial, Bend-Y, Bend-Z, Combined, Shear-Y and Shear-Z. What formula do I need to come up with for the von-Mises stress? Thanks in advance.
HD






RE: Von Mises
http://lmgtfy.com/?q=von-mises+stresses
RE: Von Mises
Typically (Mx*/øMrx)+(My*/øMry)+(N*/øNr)<=1 or (Mx*/øMrx)^2+(My*/øMry)^2+(N*/øNr)^2<=1 is used. Both are generally considered to be conservative.
RE: Von Mises
2) knowing that you need principal stresses, how can you determine them from your data ?
consider that peak shear stresses don't coincide with peak bending stresses.
Quando Omni Flunkus Moritati
RE: Von Mises
It is very rare to have an element that needs to be checked in shear and bending, but not unheard of. It occurs in large transfer beams and other similarly significant point loads as well as all "high efficiency" materials like CFS.
Here's a summary I wrote for the interns:
RE: Von Mises
RE: Von Mises
RE: Von Mises
Quando Omni Flunkus Moritati
RE: Von Mises
I have been looking at moment connections in HSS lately and I have been finding that moment and shear stresses are not so clearly separated. Due to slenderness/thin-wall/non-compact type issues, HSS members behave more like elements in a space frame where the stresses in a section are more difficult to localize, especially at connections. In that case I think that Von Mises might be useful to simplify the analysis.
RE: Von Mises