Cantilever steel shaft is loaded by concentrated couples.
Given: l1=1,4l; l2=1,9l; l3=1l; M1=0,3M; M2=0,9M; M3=0,3M. Parameter of length l=30cm; cross section diameters: d=43mm; d0=20mm. The shaft is made of steel with yielding shear stress τY=160MPa; factor of safety n=2,1.
Find: the allowable value of load parameter (in Nm) MA = ?