3. This week, we are still working on designing the tension link that suspends the gondola, but in the perspective of fatigue analysis.
Figure 1: If you don't remember what is a gondola. The attached picture is an example of the gondola at a ski resort.
a. The empty carriage weighs 1,200 lb. Maximum capacity (people and gear) is 5000 lb. The link is cylindrical and machined from steel that has Sut of 182 [ksi] and Sy of 127 [ksi]. There are no significant stress concentrations. Since life is on the line, you decide on a safety factor of n = 2
b. What are the mean and alternating loads?
c. What is the endurance strength, Se, of the metal? (Hint: You don't know the diameter of the link yet. What to do, what to do?)
d. Sketch a Goodman diagram. It should include infinite life line and yield line.
e. For a safety factor of 2 against infinite life, what should the diameter of the link be?
