AME 101 Fall 2007
Problem Set #4
Assigned: Friday, 10/26/2007
Due: Friday, 11/2/2007, 4:30 pm, in my mailbox (OHE 430J)
As always, no late homework is accepted for credit
(you may turn in late homework, however, if you just
want it graded.)
Problem #1 (15 points)
The pressure inside the cylinders of a diesel engine reaches a maximum pressure of 100 atm during
combustion. The diameter of the cylinder is about 4 inches. If a safety factor of 10 is required and
the cylinder wall material is 4340HR steel (yield stress 910 MPa = 910 x 10
6
Pa = 910 x 10
6
N/m
2
),
what wall thickness is required?
Problem #2 (25 points total)
A steel pipe is filled with steam at a pressure of 2000 lbf/in
2
. The pipe has a diameter of 1 inch and
a wall thickness of 1/16 inch.
(a)
What is the longitudinal stress and hoop stress in the pipe?
(b)
What is the moment of inertia of the pipe crosssection?
(c)
If the pipe is 10 feet long and held by pinned ends, and a 500 lbf weight is hung from middle of
the pipe (i.e., treat the pipe as a beam with a point load), what is the stress caused by just this
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 Fall '07
 Ronney
 Force, maximum normal stress, maximum shear stress, Mariana Trench, Late homework

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