Discussion
The Poisson's ratio, \(\nu\) of most aircraft grade metallic alloys has values in the range:
Answer: C
The range is \(0.2 \le \nu \le 0.4\).
The structural metals used in aircraft have Poisson's ratios close to 0.3: aluminium alloys about 0.33, titanium alloys about 0.31 to 0.34, and steels about 0.29 to 0.30. All of these fall in the band from 0.2 to 0.4.
Negative values occur only in special auxetic materials, values below 0.2 belong to materials such as some ceramics and concrete, and values near 0.5 describe nearly incompressible materials such as rubber, none of which describes aircraft-grade metals.
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