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ME 382 Fall 2007
Midterm 2
Monday, November 19, 2007
This is a closed book exam; students are allowed to use an unmarked copy of the
ME382 data book.
Answer all questions.
Show all calculations (on this exam) for full credit.
There are a total of 10 pages to this exam.
Use a ruler / straight edge to read from graphs for full credit
Name:
Section:
Honor Pledge:
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Question 1
You are part of a design team charged with designing a thinwalled spherical
pressure vessel that will have a radius of 2.00 m. The pressure vessel will
have to survive 1000 cycles of being pressurized between 4.00 MPa and
0.00 MPa. The pump cannot maintain pressure once there is a leak in the wall
of the vessel.
Any crack in the pressure vessel may be assumed to originate from the
surface and to be semicircular with a radius of
a
. The modeI stress intensity
factor is given by
K
I
=
σ
π
a
, where the stress is the stress normal to the
crack.
The pressure vessel is to be made out a steel that has a fracture toughness
of 130 MPa
m
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 Winter '08
 Thouless
 Solubility, Precipitation, Fracture mechanics, Phase transition

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