I continued to dig a little deeper, and I think the root bending stress discrepancy (wrt. proof strength) has something to do with the root radius reducing stress concentration factor at the root. With simple FEA simulation of a cantilever beam (developped thread), it is possible to see the...
maatjie_mike:
I have the same interrogation about von Mises stresses being higher than proof strength at an axial force below proof load (See picture).
I am using the stress analysis provided here (https://www.youtube.com/watch?v=46lcuQYQ14g&t=129s) which is the same as Shigley's plus the...
