POISSON'S RATIO FOR METALS



Poisson's ratio is the negative ratio of lateral strain to longitudinal strain for given material subjected to uniform longitudinal stress within the elastic deformation range. Poisson's ratio values for many metals and alloys range between 0.25 to 0.35. Poisson's ratio is an important design parameter which is needed for strength of materials calculations of metals.

Room temperature Poisson's ratio values for some of the aluminum alloys, copper alloys, cast irons, various non-ferrous metals, steel alloys and titanium alloys are given in the following chart.

Poisson's Ratio Values for Metals
Aluminum Alloys
Material Poisson's Ratio
Aluminum Alloy 1100 0.33
Aluminum Alloy 2024 0.33
 Aluminum Alloy 6061 0.33
 Aluminum Alloy 7075 0.33
Aluminum Alloy 356.0 0.33
 Copper Alloys
Material Poisson's Ratio
Copper Alloy C11000 (electrolytic tough pitch) 0.33
Copper Alloy C17200 (beryllium - copper) 0.30
Copper Alloy C22000 (Commercial bronze, 90%) 0.31
Copper Alloy C26000 (cartridge brass) 0.35
Copper Alloy C36000 (free - cutting brass) 0.34
Copper Alloy C71500 (copper - nickel, 30%) 0.34
Copper Alloy C93200 (bearing bronze) 0.34
 Cast Iron
Material Poisson's ratio
Gray Irons
Grade G1800 0.26
Grade G3000 0.26
Grade G4000 0.26
Ductile Irons
Grade 60-40-18 0.29
Grade 80-55-06 0.31
Grade 120-90-02 0.28
Various Non-ferrous Metals
Material Poisson's Ratio
Nickel 200 0.31
Inconel 625 0.31
Monel 400 0.32
Chemical Lead 0.44
Tin (Commercially pure) 0.33
Zinc (Commercially pure) 0.25
 Steel Alloys
Material Poisson's Ratio
Plain Carbon and Low Alloy Steels
Steel Alloy A36 0.30
Steel Alloy 1020 0.30
Steel Alloy 1040 0.30
Steel Alloy 4140 0.30
Steel Alloy 4340 0.30
Stainless Steels
Stainless Alloy 304 0.30
Stainless Alloy 316 0.30
Stainless Alloy 405 0.30
Stainless Alloy 440A 0.30
Stainless Alloy 17-7PH 0.30
Titanium Alloys
Material Poisson's Ratio
Commercially Pure (ASTM Grade 1) 0.34
Titanium Alloy Ti - 5Al - 2.5Sn 0.34
Titanium Alloy Ti - 6Al - 4V 0.34

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