Cantilever steel shaft is loaded by concentrated couples.
Given: l1=1,4l; l2=1,3l; l3=1,7l; M1=-1,9M; M2=1,9M; M3=1,2M. Parameter of length l=30cm; cross section diameters: d=42mm; d0=22mm. The shaft is made of steel with yielding shear stress τY=190MPa; factor of safety n=1,5.
Find: the allowable value of load parameter (in Nm) MA = ?