10:14
Given data:-
Bending moment \( M=4,000,000 \mathrm{~N} \cdot \mathrm{~mm} \)
Torque
\[
T=8,000,000 \mathrm{~N} \cdot \mathrm{~mm}
\]
\( \pm 20 \% \quad \) Fluctuation
yield strength \( b_{y}=660 \mathrm{MPa}=S_{y} \)
endurance limit \( S_{e}=300 \mathrm{MPa} \)
Strees concentration foctor for
bending \& torsion \( =1.4 \)
diameter \( d=80 \mathrm{~mm} \)
max. bending Moment
\[
M_{\max }=1.2 \times M=4800000 \mathrm{~N} \cdot \mathrm{~mm}
\]
win. bending moment
Mmin \( =0.8 \times \mathrm{M}=3200000 \mathrm{~N} \cdot \mathrm{~mm} \)