Poisson ratio


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Poisson ratio

[pwä′sōn‚rā·shō]
(mechanics)
The ratio of the transverse contracting strain to the elongation strain when a rod is stretched by forces which are applied at its ends and which are parallel to the rod's axis.
References in periodicals archive ?
And its shear parameter would be negative when material Poisson ratio is greater than 0.
t] in the modified model are obtained and expressed by the macro material parameters (the tangent Young's modulus Et and the tangent Poisson ratio [v.
Ledbetter, Poisson ratio of porous and micro-cracked solids, J.
The Young modulus E for the PP has been chosen to 1400 MPa between 20[degrees]C and 40[degrees]C, the Poisson Ratio v to 0.
The nonlinear Poisson ratio for EPDM materials using the Ogden strain energy function was also plotted.
Second, the reference to a time-dependent Poisson ratio (elastic or viscous) does not reveal physical mechanisms for the nonmonotonic changes in the specific volume, since Poisson's ratio of a viscoelastic medium is not a material parameter, but a geometrical characterization of deformation.
The Poisson ratios determined from tension tests using optical displacement measurement are presented in Table 1.
The Poisson Ratios are taken from the Wood Handbook (FPL 1999) for solid wood.
The Young's moduli of nanocomposites have been found to be sensitive to both the volume fraction and the reinforcement diameters, and Poisson ratios are influenced by the volume fraction only.
However, most of the techniques are not assessing the Poisson ratios (PR) effect, or simply assume that PR's of the layers are equal.