Bulk Modulus - Metals and Alloys

Bulk modulus of some common metals and alloys

Bulk Modulus of Elasticity is the ratio of stress to change in volume of a material subjected to axial loading.

Material Bulk Modulus
(106 psi)
Aluminum, various alloys 9.9 - 10.2
Brass, 70-30 15.7
Brass, cast 16.8
Copper 17.9
Iron, cast 8.4 - 15.5
Iron, malleable 17.2
Magnesium alloy 4.8
Monel metal 22.5
Phosphor bronze 16.3
Stainless Steels 18-8 23.6
Steel, cast 20.2
Steel, cold rolled 23.1
Steel, various 22.6 - 24.0

Bulk Modulus is related to Modulus of Elasticity and Poisson's Ratio as

K = E / 3 (1 - 2 r)         (1)

where

K = Bulk Modulus

E = Modulus of Elasticity

r = Poisson's Ratio

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