A solid square rod is cantilevered at one end. The rod is 0.8 m long and supports a completely reversing

transverse load at the other end of 50 kN. The material is AISI 1060 hot-rolled steel (s = 370 MPa,

Su = 680 MPa). Use a design factor of 2 and determine the dimensions of the square cross section for

the following cases. Neglect any stress concentration.

a. The rod must support this load for 100 cycles.

b. The rod must support this load for 104 cycles.

c. The rod must have infinite life.