Exam#2 - Exam#2 ME 414 Mechanical Design I Spring 2011...

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Exam #2 ME 414 Mechanical Design I Spring, 2011 Instructions: This exam consists of three problems worth a total of 60 points. The only materials permitted are the textbook (Shigley, et al.), a calculator and ONE SIDE of an 8.5"x11" HANDWRITTEN crib sheet, which MUST be turned in with the exam. 1. The piston rod shown in the figure below is made of AISI 1020 cold drawn steel and has a diameter of d =1.0". a) Suppose that the 3" diameter piston operates at a maximum pressure of 1200 psi. Assuming that the ends of the rod can be modeled as pinned-pinned, determine the maximum allowable length of the rod for a factor of safety of n =2 against buckling. In this case, does the rod behave as an Euler or Johnson column? (10 points) b) Repeat part a) if the maximum operating pressure is doubled. (5 points) c) Supposed that the ends of the rod were modeled as fixed-fixed in parts a) and b). Would this have changed the behavior of the rod as either an Euler or Johnson column? Clearly explain why or why not. (5 points) Total Points : 20

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Exam#2 - Exam#2 ME 414 Mechanical Design I Spring 2011...

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