A bar is subjected to a combination of a steady load of 60 kN and a load fluctuating between -10 kN and 90 kN

Q. A bar is subjected to a combination of a steady load of 60 kN and a load fluctuating between -10 kN and 90 kN.   The   corrected   endurance   limit   of   the   bar   is 150 MPa, the yield strength of the material is 480 MPa and the ultimate strength of the material is 600 MPa. The bar cross-section is square with side a. If the factor of safety is 2, the value of a (in mm), according to the modified Goodman’s criterion, is__________(correct to two decimal places).

Ans: 31.60 – 31.65