Cantilever steel shaft is loaded by concentrated couples.Cross sections at each segment of the shaft are circular.
Given: l1=1,7l; l2=1,9l; l3=1,4l; M1=-2M; M2=-1M; M3=1,4M. Parameter of length l=50cm; diameters of cross sections: d1=42mm; d2=21mm; d3=33mm. The shaft is made of steel with yielding shear stress τY=240MPa; factor of safety n=2.
Find: the allowable value of load parameter (in Nm) MA = ?

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