Table 2.

Provenzano et al. [18] reported their experimental MCL stress-relaxation data as fitted faithfully to the function $\sigma (t)={\sigma }_0{t}^{-n}$

${\epsilon }_0$	$\sigma ={\sigma }_0{t}^{-n}\hspace{0.17em}(\text{MPa})$	${\sigma }^a({\epsilon }_0)\hspace{0.17em}(\text{MPa})$	K 2	τ	β
0.82 %	$1.474t^{-0.141}$	2.395	$1.00\times {10}^{-2}$	0.032	0.141
1.74 %	$5.700t^{-0.053}$	6.841	$2.11\times {10}^{-2}$	0.032	0.053
2.38 %	$10.103t^{-0.025}$	11.011	$2.88\times {10}^{-2}$	0.032	0.025
3.74 %	$15.015t^{-0.012}$	15.648	$4.50\times {10}^{-2}$	0.032	0.012

Their data was represented by our RVE framework using the power-dist-user model in Table 1, to produce ${\sigma }^a({\epsilon }_0)$ and $\beta (K_2)$, assuming that $\tau (K_2)=0.032\hspace{0.17em}\mathrm{s}$ for all ${\epsilon }_0$. The function $\beta (K_2)$ employed in febio was piecewise linear over the range of K₂ values shown here, and held constant outside of that range.