| 单词 | Poisson's ratio |
| 释义 | Poisson's ratio The ratio of the lateral strain to the longitudinal strain in a stretched rod. If the original diameter of the rod is d and the contraction of the diameter under stress is Δd , the lateral strain Δd/d = sd ; if the original length is l and the extension under stress Δl, the longitudinal strain is Δl/l = s1. Poisson's ratio is then sd/sl . For steels the value is between 0.28 and 0.30 and for aluminium alloys it is about 0.33. It was first introduced by Simeon Poisson (1781–1840) |
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