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Problem 1.34
The
strengthtoweight ratio
of a structural
material is defined as its loadcarrying capacity divided by
its weight. For materials in tension, we may use a character
istic tensile stress (as obtained from a stressstrain curve)
as a measure of strength. For instance, either the yield
stress or the ultimate stress could be used, depending upon
the particular application. Thus, the strengthtoweight ratio
R
S/W
for a material in tension is defined as
R
S/W
5
}
s
g
}
in which
s
is the characteristic stress and
g
is the weight
density. Note that the ratio has units of length.
Using the ultimate stress
s
U
as the strength parameter,
calculate the strengthtoweight ratio (in units of meters)
for each of the following materials: aluminum alloy
6061T6, Douglas fir (in bending), nylon, structural steel
ASTMA572, and a titanium alloy. (Obtain the material
properties from Tables H1 and H3 of Appendix H. When
a range of values is given in a table, use the average value.)
12
CHAPTER 1
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This note was uploaded on 09/20/2009 for the course COE 3001 taught by Professor Armanios during the Spring '08 term at Georgia Institute of Technology.
 Spring '08
 Armanios

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