The Ogden hyperelastic solid constitutive model.[^1]
**Parameters**
- The bulk modulus $`\kappa`$.
- The shear moduli $`\mu_n`$ for $`n=1\ldots N`$.
- The exponents $`\alpha_n`$ for $`n=1\ldots N`$.
**External variables**
- The deformation gradient $`\mathbf{F}`$.
**Internal variables**
- None.
**Notes**
- The shear modulus is given by $`\mu=\boldsymbol{\alpha}\cdot\boldsymbol{\mu}/2`$.
- The Ogden model reduces to the [Neo-Hookean model](super::NeoHookean) when $`N=1`$ and $`\alpha_1\to 2`$.