Cantilever steel shaft is loaded by concentrated couples.Cross sections at each segment of the shaft are circular.
Given: l1=1,1l; l2=1,7l; M1=1,9M; M2=-3,9M. Parameter of length l=20cm; diameters of cross sections: d1=24mm; d2=34mm. The shaft is made of steel with yielding shear stress τY=210MPa; factor of safety n=2.
Find: the allowable value of load parameter (in Nm) MA = ?