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220.127.116.11 Simo Damage Criterion
Simo [70, 71] proposed a damage criterion related to the strain energy density, This damage measure is valid for isotropic or anisotropic materials, since the strain energy density must satisfy the frame-invariance of Eq.1↓ by construction. Its resulting damage surface normal is where we have used the result of Eq.(18.104.22.168-2). The normal reduces to the null tensor in the limit when and tend to zero.