Von Mises Stress

ONEPOINT · Sep 23, 2005

Hi All,

I am quite new in the FEA. I would like to know what is the Von Mises stress and how is it used to predict failure?
What kind of failure is this, and what failure theory is being used?
What are the advantages/disadvantages and limitations of this theory?

Best regards,

ONEPOINT

EricZhao · Sep 23, 2005

If u goto efunda.com and search "von mises", u can find detailed answer to ur questions.

feadude · Sep 23, 2005

Von Mises failure theory is widely accepted for ductile material such as steel it works off of yield not ultimate tensile strength.

good57morning@netzero.com

GBor · Sep 23, 2005

It is also a combined stress theory taking into account the principle stresses and shear. Don't recall the formula off the top of my head, but efunda should give it to you as should the course notes from MIT's open course information.

Garland

johnhors · Sep 23, 2005

Sorry GBor, but "principle" stress does not exist !

feadude · Sep 23, 2005

Shearing stresses on the planes on which principal stresses SIGMAmax and SIGMAmin occur are always zero, regardless of the values of SIGMAx, SIGMAy and TIxy.

good57morning@netzero.com

GBor · Sep 23, 2005

johnhors,

I KNEW someone would get me on that. One of those "DON'T SEND THIS" as I pressed the button kinda' things! Perhaps you would prefer "principal" stress?

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