You are to design a tension member.... You are to design a tension member (square rod) with a cross section to carry a mass of 575 000 kg with a safety factor of 2 against yield and a safety factor of 3 against static fracture (overload). a) What is the design stree that you will use for the application? Why? b) What are the appropriate bar dimensions for use? ============================================================= FS = UTS / R [sigma] = F / Ao Ao = L * w ====================================================== FS = 1279MPa / 3 = 426.33333... MPa ~ 426 MPa that's the design stress considering static fracture FS = 862 / 2 = 431 MPa that's the design stress consider yield stress/strength So, I'm considering using a design stress that is the average of these two values, which would be: 429 MPa I'm just confused, because we haven't done anything like this in class. Now for part b) [sigma] = F / l*w F = 575 * 103(kg) * 9.81(m/s2) F = 5.641 MN (mega Newtons) 429 = 5.641 MN / Ao Ao = 13148.6014 MM (mega meters? I'm not sure about the units on this one) l = w = 6574 MM Please help and thank you; ie, does this look right to you?