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Wasn't sure where to post this, hope it's ok in here!

I've gotten myself very confused as to how to find the minimum yield strength for an element. I have used Mohrs circle to find sigma1 and sigma2, then plugged that into the von mises equation to find sigma-von = 636.8MPa. The textbook gives me the answer of minimum yield strength of 660.4MPa, but how do I get to that? I've checked and double checked my sigma1 and 2 answers (610.2 and -50.2)and I think they are correct. Not sure where to go from here and neither lecture slides nor textbook are helping much!

Thanks!

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# Mohrs Circle, Von Mises and Minimum Yield Strength Help!

**Physics Forums | Science Articles, Homework Help, Discussion**