TABLE 1.

The material parameters of the soft tissue matrix and collagen fibers used in the FE modeling

Test A	Permeability	k	2.50	10–3 mm4 N–1 s–1
Linearly elastic, isotropic, homogeneous	Young's modulus	E	0.55	MPa
	Poisson's ratio	ν	0.1	–
Test B	Permeability	k(ξ)	Fig. 4a	10–3 mm4 N–1 s–1
Linearly elastic, isotropic, inhomogeneous	Young's modulus	E(ξ)	Fig. 4b	MPa
	Poisson's ratio	ν	0.1	–
Test C	Undeformed permeability	k0(ξ)	Fig.4a	10–3 mm4 N–1 s–1
Hyperelastic, finite deformation, with collagen fibers, homogeneous matrix	Permeability parameter	M 0	1.3	–
	Matrix material parameter	A 0	C 0	MPa
	Matrix material parameter	B 0	C 0	MPa
	Matrix material parameter	κ	20 C0	MPa
	Matrix material parameter	C 0	0.1	MPa
	Fiber material parameter	C 1i	0.1	MPa
	Fiber material parameter	λ	0.15	MPa
	Fiber material parameter	C 1a	5.0	MPa
	Matrix-to-solid fraction	${\tilde{\varphi }}_{0R}$	$1-{\tilde{\varphi }}_{1R}$	–
	Fiber-to-solid fraction	${\tilde{\varphi }}_{1R}$	Fig. 2b	–
Test D	Undeformed permeability	k0(ξ)	Fig.4a	10–3 mm4 N–1 s–1
Hyperelastic, finite deformation, with collagen fibers, inhomogeneous matrix	Permeability parameter	M 0	1.3	–
	Matrix material parameter	A 0	C0inh(ξ)	MPa
	Matrix material parameter	B 0	C0inh(ξ)	MPa
	Matrix material parameter	κ	20 C0inh(ξ)	MPa
	Matrix material parameter	C0inh(ξ)	Fig.4c	MPa
	Matrix material parameter	a C0	1.75	–
	Matrix material parameter	b C0	5.0	–
	Fiber material parameter	C 1i	0.1	MPa
	Fiber material parameter	λ	0.15	MPa
	Fiber material parameter	C 1a	5.0	MPa
	Ref. matrix-to-solid fraction	${\tilde{\varphi }}_{0R}$	$1-{\tilde{\varphi }}_{1R}$	–
	Ref. fiber-to-solid fraction	${\tilde{\varphi }}_{1R}$	Fig. 2b	–
All Tests	Referential solid fraction	ϕ s R	0.2	–
	Referential fluid fraction	ϕ f R	0.8	–