Poisson's Ratio

Ratio of strain in the lateral direction to strain in the axial direction, when a tensile stress is applied to a material.

Its value for many solids, is close to 1/3.

For elastomers it is just under 0.5.

Poisson′s ratio is given by the following equation, the minus sign accounts for the sign change between the lateral and longitudinal strains.


ν = poisson′s ratio
εlateral = lateral strain
εlongitudinal = longitudinal strain

Brittle materials have the lowest Poisson′s ratio and generally materials appear to become more flexible as the Poisson′s ratio increases.

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Aluminium 0.33 Clip
Aluminium 1199 0.33 Clip
Aluminium 3003 0.33 Clip
Aluminium 4000 series 0.34 Clip
Aluminium 6066 0.33 Clip
Bismuth 0.33 Clip
Brass 0.35 Clip
Bronze 0.34 Clip
Cast Iron 0.2 to 0.3 Clip
Copper 0.33 to 0.36 Clip
Fused Silica 0.17 Clip
Gold 0.44 Clip
Iron 0.27 to 0.29 Clip
Magnesium 0.35 Clip
Nickel 0.31 Clip
Platinum 0.38 Clip
Polycarbonate 0.37 Clip
Polymethyl Methacrylate Resin 0.4 Clip
Pyrex Glass 0.24 Clip
Silver 0.37 Clip
Sodium Chloride 0.252 Clip
Sodium I Fluoride 0.326 Clip
Stainless Steel 303 0.25 Clip
Stainless Steel 304 0.27 Clip
Steel 0.29 Clip
Steel EN1A 0.27 to 0.30 Clip
Titanium 0.33 Clip
Tungsten 0.2 to 0.34 Clip
Zinc Sulphide 0.29 Clip
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See also: Mechanical Properties, Shear Modulus.

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Subjects: Mechanical Engineering Physics