Poisson's Ratio 4
Poisson's Ratio 4 : One of the elastic constants of a material. Defined as the ratio of the lateral contraction per unit breadth to the longitudinal extension per unit length when a piece of material is stretched. If a metal bar is 1000 mm long, and 10 mm thick, is stretched -and the stretch is 7. 5 mm; then the longitudinal extension per unit length is 7. 5/1000 = . 0075 per mm. The lateral contraction is . 025 mm, so the lateral contraction per unit breadth is . 025/10 per mm. Poisson's ratio is: (lateral contraction / orig. diam). / (longitudinal extension / orig. length) = (0. 025 / 10) X (1 / 0. 0075) = 0. 33
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