Geomechanics and FracturingIn-Situ Stress and Rock Mechanics

Shear Modulus from Young's Modulus and Poisson Ratio Formula

G = \frac{E}{2(1 + \nu)}

Shear Modulus from Young's Modulus and Poisson Ratio calculates shear modulus for in-situ stress and rock mechanics workflows in geomechanics and fracturing.

Calculate

How engineers use this formula

Use this formula when the listed inputs (E, nu) are known and the assumptions behind the cited in-situ stress and rock mechanics relationship match the engineering case being checked.

Assumptions

Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
The declared units match the field-unit constants used in the formula.
The cited formula applies to the selected petroleum engineering workflow.

Limitations

The calculation does not replace a full engineering model or operating procedure.
Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.

Common mistakes

Mixing unit systems without converting the inputs.
Using default example values as field recommendations.
Applying the formula outside the source assumptions.

Default example

Using the default inputs, G_shear equals 2,000,000 psi.

Epsi

5000000

nudimensionless

0.25

Inputs

E

psi

Young's Modulus

nu

dimensionless

Poisson Ratio

Outputs

G_shear

psi

Shear Modulus

Source and review

reviewed

Aslannezhad et al. 2021. Geomechanical model and wellbore stability analysis utilizing acoustic impedance and reflection coefficient in a carbonate reservoir. Journal of Petroleum Exploration and Production Technology.

Source