Table 1.

Experimental setups and quantified mechanics-related parameters for each of the seven biaxial tension protocols, showing loading ratio ($F_X:F_Y$), strain rate (%/s), portion of cycle, low-tensile modulus ($E_{\mathit{LT}}$), high-tensile modulus ($E_{\mathit{HT}}$) and index of extensibility (${\lambda }^{\ast }$).

Protocol	Loading ratio	Strain rate (%/s)		Portion of cycle	$E_{\mathit{LT}}$ (kPa)		$E_{\mathit{HT}}$ (kPa)		${\lambda }^{\ast }$ (-)
	($F_X:F_Y$)	X-Dir	Y-Dir		X-Dir	Y-Dir	X-Dir	Y-Dir	X-Dir	Y-Dir
1	1:1	0.98	2.90	Loading	35.7	22.5	3158.2	1481.7	1.20	1.58
				Unloading	26.4	18.6	4260.1	2052.3	1.20	1.60
2	0.75:1	0.77	2.83	Loading	36.2	23.8	3808.2	1795.4	1.17	1.61
				Unloading	26.8	20.4	5064.7	2545.4	1.17	1.64
3	0.5:1	0.58	2.95	Loading	41.5	25.5	3876.6	1853.9	1.13	1.64
				Unloading	19.1	17.1	5267.0	2622.3	1.13	1.67
4	0.25:1	0.17	2.89	Loading	63.4	22.0	8168.5	2313.4	1.04	1.69
				Unloading	32.4	16.8	10453.4	3236.9	1.04	1.71
5	1:0.75	1.20	3.07	Loading	37.1	26.8	2939.2	1321.3	1.21	1.55
				Unloading	25.0	21.2	3905.7	1763.9	1.22	1.58
6	1:0.5	1.73	3.32	Loading	40.5	28.7	2233.1	905.1	1.25	1.47
				Unloading	25.7	23.0	2802.0	1151.7	1.26	1.49
7	1:0.25	2.38	2.60	Loading	47.4	35.2	1802.9	506.0	1.29	1.30
				Unloading	37.2	35.7	2311.9	637.6	1.31	1.32