When a shaft of diameter D is subjected to a twisting moment T and a bending moment M, then the maximum normal stress is given by
1
\(\frac{{16}}{{\pi {D^3}}}\left[ { \sqrt {{M^2} + {T^2}} } \right]\)
2
\(\frac{{16}}{{\pi {D^3}}}\left[ { \sqrt {{M^2} - {T^2}} } \right]\)
3
\(\frac{{16}}{{\pi {D^3}}}\left[ {M + \sqrt {{M^2} + {T^2}} } \right]\)
4
\(\frac{{16}}{{\pi {D^3}}}\left[ {M - \sqrt {{M^2} + {T^2}} } \right]\)