Cantilever steel shaft is loaded by concentrated couples.
Given: l1=1,2l; l2=1,5l; l3=1,4l; M1=-1,8M; M2=-2,6M; M3=2,1M. Parameter of length l=30cm; cross section diameters: d=35mm; d0=23mm. The shaft is made of steel with yielding shear stress τY=240MPa; factor of safety n=1,5.
Find: the allowable value of load parameter (in Nm) MA = ?