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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 pinnedpinned, 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 fixedfixed 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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 Fall '11
 Dr.Klingbeil

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