Advanced elasticity/Mooney-Rivlin material
where: and are constants.
The stress tensor depends upon Finger tensor by the following equation:
Uniaxial extension 
For the case of uniaxial elongation, true stress can be calculated as:
and w:engineering stress can be calculated as:
The Mooney-Rivlin solid model usually fits experimental data better than w:Neo-Hookean solid does, but requires an additional empirical constant.
Elastic response of rubber-like materials are often modelled based on the Mooney-Rivlin model.
- C. W. Macosko Rheology: principles, measurement and applications, VCH Publishers, 1994, ISBN 1-56081-579-5
Notes and References 
- The characteristic polynomial of the linear operator corresponding to the second rank three-dimensional Finger tensor is usually written