A tie bar is made of a material having a tensile strength of 231 MPa and has to carry a load of 255 kN. What id the diameter of the bar if a factor of safety of 7 is applied?

Question

ANS = 99.2 mm

Cannot figure out how to get the answer. Need help please. Thank you

Answer 1

i just did it and found the solution:
factor of safety= ultimate stress/allowable stress so allowable stress=ultimate stress/7--->231/7=33mpa.
D square=(255E3 * 4)/(33E6 * 3.14)= 0.00984.
d=0.0992m = 99.2mm
:)