Cantilever rod is loaded by axial concentrated forces. Cross sections at each segment of the rod are square.
Given: l1=1,7l; l2=1,4l; l3=1,2l; F1=1,9P; F2=2,2P; F3=3,5P. Parameter of length l=50cm, parameter of loading Р= 21кN.Sizes of square cross sections: a1 =19мм, a2=13мм, a3=25мм.
Find: maximal absolute value of normal stress σ (in MPa).