conspire 0.7.7

The Rust interface to conspire.
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The Isihara hyperelastic solid constitutive model.[^1]

**Parameters**
- The bulk modulus $`\kappa`$.
- The shear modulus $`\mu`$.
- The extra modulus $`\mu_m`$.
- The quadratic modulus $`\mu_q`$.

**External variables**
- The deformation gradient $`\mathbf{F}`$.

**Internal variables**
- None.

**Notes**
- The Isihara model reduces to the [Mooney-Rivlin model](super::MooneyRivlin) when $`\mu_q\to 0`$.

[^1]: A. Isihara, N. Hashitsume, and M. Tatibana, [J. Chem. Phys. **19**, 1508 (1951)](https://doi.org/10.1063/1.1748111).