Hello Folks,
I am working on the bolt strength problem. I am using M10, 10.9 grade bolts. In the first step pretension is applied and 2nd step actual(external) load is applied which should cause the shear. But when I am checking results- Max shear is nearly same in both steps (Pretension- 352 Mpa and Actual load- 358 Mpa). Considering the shear criteria which is 0.5 UTS (10.9 bolt 1000 Mpa), how should I validate the bolt design? Most of shear stress is due to pretension. Using linear superposition in Hyperview and eliminating pretension from the step, Max shear is 53 Mpa. I am using optistruct as solver.
The bolts are actually failing in the testing.
Can someone please help me in validating the bolt design?
