Hi 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!