Isotropic Softening Material

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Constitutive Law

This MPM Material is an isotropic, elastic material, but once it fails, it develops anisotropic damage. The constitutive law for this material is

[math]\displaystyle{ \sigma = ( I - D)C \varepsilon }[/math]

The elastic regime for this material is identical to a Mooney except that it only allows a Neohookean elastic regime (with G = G₁ and G₂ = 0).,

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