Cantilever steel shaft is loaded by concentrated couples.Cross sections at each segment of the shaft are circular.
Given: l1=1,2l; l2=1,3l; M1=1,7M; M2=-4M. Parameter of length l=30cm; diameters of cross sections: d1=26mm; d2=33mm. The shaft is made of steel with yielding shear stress τY=190MPa; factor of safety n=1,9.
Find: the allowable value of load parameter (in Nm) MA = ?