Homework SourseQ the sketch shows a section of 1045 TGP shafting with a tra
Q: the sketch shows a section of 1045 TGP shafting with a transverse hole drilled through it. When installed in an oil rig, the shaft is loaded with alternating bending and a mean torsion.
Find the appropriate endurance limit for this part and the appropriate stress concentration factors K(f).
I. (60 pts) The sketch shows a section o through it. When i shows a section of 1045 TGP shafting with a transverse hole a g bending an torsion. hen installed in an oil rig, the shaft is loaded with alt Find the appr concentration factors K priate st nd the appropriate endurance limit for this part and the appropriate st Su 91 kps 1.25 (15)91 Se k.ky ke kkk 0.12.5\" hot Solution
For the given material, Sut = 91kpsi
If 80 < Sut < 200 kpsi, then Endurance limit, S\'e = 0.5 Sut
S\'e = 45.5 kpsi
For stress concentration factor, Kf = 1+q(Kt + 1)
where q - notch sensitivity factor
and Kt - geometric stress concentration factor
Kt1 = 2.7 for bending and Kt2 = 1.68 for torsion
Overall Kt = sqrt [(Kt1)2 + (Kt2)2] = 3.18
notch radius = 0.125*25.4/2 = 1.5875
q = 0.8 is obtained from the notch sensitivity curves
Hence, Kf = 1+q(Kt + 1) = 1 + 0.8(3.18+1) = 4.36
