define poisson's ratio
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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.
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Poisson's ratio is a material constant that relates stress in one direction to elastic strain in another.
*Stress describes an external force applied to a material
*Strain measures the change in shape as a result of that force.
μ = - εt / εl
where
μ = Poisson's ratio
εt = transverse strain (m/m, ft/ft)
εl = longitudinal or axial strain (m/m, ft/ft)
*Stress describes an external force applied to a material
*Strain measures the change in shape as a result of that force.
μ = - εt / εl
where
μ = Poisson's ratio
εt = transverse strain (m/m, ft/ft)
εl = longitudinal or axial strain (m/m, ft/ft)
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