Cantilever steel shaft is loaded by concentrated couples.Cross sections at each segment of the shaft are circular.
Given: l1=1,7l; l2=1,5l; l3=1,7l; M1=-1,1M; M2=-0,6M; M3=1,4M. Parameter of length l=40cm; diameters of cross sections: d1=36mm; d2=21mm; d3=45mm. The shaft is made of steel with yielding shear stress τY=250MPa; factor of safety n=1,4.
Find: the allowable value of load parameter (in Nm) MA = ?