Two Years Ago When Social Distancing Was Mandated You Played Monkey Bars Along In Your Backyard One Day You Were Stu 1 (63.61 KiB) Viewed 23 times
Two years ago, when social distancing was mandated, you played monkey bars along in your backyard. One day, you were stuck in the middle, and you realized that your feet were still 0.5 m above the ground. To touch down on the ground safely you decided to utilize the creep behavior of the bar and wait. The bars are made of an alloy, of which the creep behavior is described by: Ěy = 1.0 10-6ÕH x (s-1) where ÕH is in the units of MPa. It is also provided that the length of each bar is 1.0 m, and it has a ring-shape cross section with the radius of 10 mm and thickness of 2 mm. Answer the following questions: R=10 mm 1 t=2 mm I h = 0.5 m (a) Assume your weight is 65 kg. How long would it take for your feet to touch the ground (in minutes)? (20 points)
(b) To shorten the waiting time in case you get stuck again, you decide to do some materials processing to change the grain sizes of the alloy. Should you increase or reduce the grain sizes? Justify your answer. (5 points)
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