Cantilever steel rod is loaded by axial concentrated forces. Cross sections at each segment of the rod are square.
Given: l1=1,3l; l2=1,9l; l3=1,9l; F1=3,5P; F2=2,4P; F3=1,5P. Parameter of length l=20cm, sizes of square cross sections: a1 =25мм, a2=14мм, a3=20мм. The rod is made of steel with yielding stress σY=340MPa; factor of safety n=1,5.
Find: allowable value of load parameter (in kN) PA = ?