Machine Le 1. A group of college students are designing a utility trailer for their TR project, similar to the figure be

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Machine Le 1 A Group Of College Students Are Designing A Utility Trailer For Their Tr Project Similar To The Figure Be 1 (55.31 KiB) Viewed 111 times

Machine Le 1. A group of college students are designing a utility trailer for their TR project, similar to the figure below. They have determined that the fully loaded trailer + load will weigh 900 lbs, and that the empty trailer will weigh 200 lbs. Due to the requirement for a low deck height, the springs cannot deflect more than 0.75" at FULL LOAD, before the axle will contact with the frame. The students have found K-= 0.48 and they wish to use a Safety Factor of 1.25. There are *2 springs*, each taking half of the load! Looking at spring supplier catalogs, they have found a potential spring. Spring properties Width 1.77 Thickness=0.55" Length = 55" Number of Leaves=4 Spring Steel properties: S, = 246ksi Sy = 228ksi E-30 E6 S; = 100ksi Determine: a. The spring stiffness (actual vs desired), and in your opinion, are they close enough? b. Will the chosen spring fail in YIELD? c. Will the chosen spring fail in FATIGUE? (for infinite number of cycles, is Omax < Smax--)