Properties of Metals
DOE-HDBK-1017/1-93
YOUNG'S MODULUS
We can now see that Young's Modulus may be easily calculated, provided that the stress and
corresponding unit elongation or strain have been determined by a tensile test as described
previously. Strain (e) is a number representing a ratio of two lengths; therefore, we can
conclude that the Young's Modulus is measured in the same units as stress (s), that is, in pounds
per square inch. Table 1 gives average values of the Modulus E for several metals used in DOE
facilities construction. Yield strength and ultimate strength will be discussed in more detail in
the next chapter.
E (psi)
Yield Strength (psi)
Ultimate Strength (psi)
Aluminum
1.0 x 107
3.5 x 104 to 4.5 x 104
5.4 x 104 to 6.5 x 104
Stainless Steel
2.9 x 107
4.0 x 104 to 5.0 x 104
7.8 x 104 to 10 x 104
Carbon Steel
3.0 x 107
3.0 x 104 to 4.0 x 104
5.5 x 104 to 6.5 x 104
Example:
What is the elongation of 200 in. of aluminum wire with a 0.01 square in. area if it
supports a weight of 100 lb?
Solution:
d
=
(2-8)
P
AE
=
(100 lb) (200 in.)
(0.01 in.2) (1.0 x 107 lb/in.2)
d
= 0.2 in.
Rev. 0
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