September 26, 2018 at 5:41 amashish35Subscriber
I couldn't find any option to view signed Von Mises stress result in Mechanical. Is it possible to view this result?
September 26, 2018 at 7:42 amRohith PatchigollaAnsys Employee
Signed von Mises stress can be calculated using user-defined results.
Hydrostatic stress is simply the average of the three normal stresses [(sx+sy+sz)/3 ], so dividing the hydrostatic stress by the absolute value of itself will give -1 for compression and +1 for tension [(sx+sy+sz)/abs(sx+sy+sz)].
This stress sign can be directly multiplied by the unsigned von Mises stress to produce the signed von Mises stress.
Signed Von Mises = seqv*(sx+sy+sz)/abs(sx+sy+sz)
But the method breaks down when the hydrostatic stress is zero. So, we add a small number to the equation as shown below.
Please use the below expression in a user defined result to get the Signed Von Mises stress.
Hope this helps.
September 26, 2018 at 12:09 pmashish35Subscriber
Thank you so much. This is spot on.
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