Q: the sketch shows a section of 1045 TGP shafting with a transverse hole drille

Question

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

Explanation / Answer

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

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