Table 2.

Values for parameters used within the model, as well as justification for parameter values. The last four parameters in the table (shown in bold) were regressed to the combined uniaxial/biaxial data set.

Symbol	Description	Value	Justification
Ω	Network Orientation	Ωθθ = 0.6, Ωzz = 0.3	Extrapolated from structural histology [20]
Ωrr = 0.1
Af	Cross-sectional area	31,416 nm2	Elastin fiber radius 100 nm [24,25]
Φ	Fiber volume fraction	0.05	Based on Ref. [17]
ν	Poisson’s ratio	0.49	Nearly incompressible [15]
wu, lu, tu	Uniaxial undeformed dimensions	Width = 5.00 mm	Measured in experiment
		Length = 13.0 mm
Thickness: 1.5 mm
wb, lb, tu	Biaxial undeformed dimensions	Width = 6.00 mm	Measured in experiment
		Grip-to-Grip Length = 15.0 mm
Thickness: 1.5 mm
Ef	Fiber modulus of elasticity	2.51 MPa	Fit to data
λcrit	Lambda critical fiber failure	2.17	Fit to data
G	Matrix shear modulus	1.7 kPa	Fit to data
ß	Non-linearity fitting parameter	2.35	Fit to data