Formulas: basic principles

MIL-HDBK-5J, Metallic Materials and Elements for Aerospace Vehicle Structures

Last Updated 29 Oct 2026

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Formula 1

1.4.6.1 Modulus of Rigidity (G)—This property is the initial slope of the shear stress-strain curve. It is also referred to as the modulus of elasticity in shear. The relation between this property and the modulus of elasticity in tension is expressed for homogeneous isotropic materials by the following equation:

\mathrm{G}=\frac{\mathrm{E}}{2(1+\mu)} \quad[1.4 .6 .1]

Found in

BASIC PRINCIPLES