Cantilever steel shaft is loaded by concentrated couples.Cross sections at each segment of the shaft are circular.
Given: l1=1,8l; l2=1,4l; l3=1,9l; M1=-1,2M; M2=-1,4M; M3=1,5M. Parameter of length l=30cm; diameters of cross sections: d1=37mm; d2=22mm; d3=47mm. The shaft is made of steel with yielding shear stress τY=170MPa; factor of safety n=1,9.
Find: the allowable value of load parameter (in Nm) MA = ?

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