Elastic modulus

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Elastic modulus is a generic name for a set of parameters that describe the elastic properties of materials:

The name Elastic modulus is sometimes used to refer to Young's modulus. This is rather ambiguous and best avoided.

The table shown below first appeared, I think, in Gassmann[1]


  1. Gassmann, F (1951). Über die Elastizität poröser Medien. Viertel. Naturforsch. Ges. Zürich 96, 1–23. [ageo.co/gassmann-de Available online.]

Table of equations

Conversion formulas — edit
The elastic properties of homogeneous isotropic linear elastic materials are uniquely determined by any two moduli. Given any two, the others can thus be calculated. Key reference: Mavko, G, T Mukerji and J Dvorkin (2003), The Rock Physics Handbook, Cambridge University Press.

P-wave velocity
S-wave velocity
Velocity ratio
1st Lamé parameter
Shear modulus
Young's modulus
Bulk modulus
Poisson's ratio
P-wave modulus