The ratio of the proportional decrease in a lateral measurement to the proportional increase in length in a sample of material that is elastically stretched.
- It will observed that the natural period is a function of the aspect ratio r and the Poisson's ratio, n.
- Most strain models assume ideal incompressible materials with a Poisson's ratio of 0.5.
- The parameters investigated are the ratio of shear modulus, ratio of shear wave velocity, the thickness of the top layer, material damping ratio and Poisson's ratio.
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