Table 1.
c1 (kPa) | C 2 | C 3 | C 4 | R2-FD | R2-XD |
---|---|---|---|---|---|
1.50 (0.10) | 28.69 (0.80) | 45.98 (0.69) | 0.00 (1.82) | 0.99 | 1.00 |
The strain energy function W was expressed in LS-Dyna as , where c1 – c4 are the material constants, Exy are the deformations (green strain components modified to only include the effects of volumetric work), and xy refers to the subscripts θ, z, and r corresponding to the circumferential, through-thickness, and radial directions, respectively. P is a Lagrange multiplier numerically enforcing the material nearincompressibility whereby J, the determinant of the deformation gradient tensor, is almost equal to 1. The values in parentheses report half the span of the 95% confidence interval. R2-FD and R2-XD represent Pearson’s product–moment correlation coefficients in fiber and cross-fiber directions, respectively.