Fig. 13.

Relationship between the incremental Poisson's ratio and the orientation index for models with c = 4 mg/ml subjected to uniaxial (reproduced from Fig. 6) and biaxial loading. In the uniaxial case, $P_2$ is computed in 3D. In the biaxial case, both ${\nu }_i$ and $P_2$ are computed as averages over the x₁ − x₃ and x₂ − x₃ faces of the model. Biaxial stretch is applied in the x₁ and x₂ directions.