Fatigue loading of bolted joints (24 pts.) consider a bolted joint with a stiffness ratio, c = 0.3. the 0.25" diameter bolt is made from sae grade 5 steel and has unf cut threads. previous calculations showed that fi, sep = 3,000 lb and fi, static_yield = 4,000 lb. sut = 1. bolt properties needed calculate fatigue factors of safety are: from table: from table: s/k; (rolled threads) = from table: k; (rolled threads) = from table: k; (cut threads) = from table: at = from table: __ (calculated from se/k; (rolled) above) se = calculate 2. assume that an external load of 500 lb is repeatedly applied then removed (p cycles between 0 and 500 lb). for overload of p only, if we wish to have a factor of safety of 1.5 against fatigue proof loading, calculate the preload that should be applied. use kr for cut threads. 3. for the overload described above, calculate the preload needed for a factor of safety of 1.5 against fatigue fracture. use kr for cut threads. 4. based on fatigue, the maximum / minimum (circle one) preload should be ib. 5. based on the static preloads described above and your fatigue calculations, the allowable range of preloads is: ib < f; < 6. the joint design will / will not (circle one) work as designed (meaning all factors of safety can be met).