Cantilever steel rod is loaded by axial concentrated forces. Cross sections at each segment of the rod are square.
Given: l1=1,7l; l2=1,8l; l3=1,1l; F1=1,3P; F2=2,6P; F3=3,8P. Parameter of length l=20cm, sizes of square cross sections: a1 =19мм, a2=13мм, a3=24мм. The rod is made of steel with yielding stress σY=230MPa; factor of safety n=2,3.
Find: allowable value of load parameter (in kN) PA = ?