Table 2.

Material parameters of MY determined using Ogden strain energy density function, MY has a residual stretch ratio of 1.2. Hysteresis tests (HY) were performed on samples 1 to 6, ramp-hold tests (RH) were performed on samples 7 to 15. Mean, standard deviation and median are calculated for all tests. The hysteresis test, due to its short duration (0 to 6 s), gave only one Prony series term and this was characterized by a small relaxation time, while the ramp-hold test, due to its long duration (0 to 600 s), gave two Prony series terms.

Type	No.	μ (Pa)	α	γi	τi (s)	G (∞)	Residual Stress (Pa)
HY	1	10.2	16.8	0.63	0.23	0.37	25.9
	2	7.03	13.9	0.58	0.66	0.42	12.8
	3	14.9	24.6	0.35	0.64	0.65	10.7
	4	11.0	19.7	0.61	0.19	0.39	40.3
	5	11.9	19.8	0.49	0.20	0.51	44.0
6	11.3	10.4	0.24	0.21	0.76	14.4
RH	7	6.20	19.1	0.50, 0.35	0.27, 248	0.15	24.4
	8	8.43	16.7	0.59, 0.14	0.18, 118	0.27	14.8
	9	6.13	25.7	0.32, 0.35	0.40, 100	0.33	51.4
	10	6.62	15.9	0.49, 0.49	0.32, 219	0.02	15.1
	11	10.4	22.9	0.17, 0.39	0.55, 84.7	0.44	53.4
	12	8.24	7.51	0.34, 0.17	0.44, 162	0.49	8.50
	13	7.93	12.6	0.02, 0.01	0.43, 37.1	0.97	12.5
	14	8.38	13.2	0.01, 0.15	0.44, 600	0.84	14.1
15	6.37	27.0	0.28, 0.20	0.42, 47.8	0.52	64.9
Mean		9.0	17.7	0.37, 0.25	0.37, 177	0.48	27.2
S.D.		2.54	5.72	0.20, 0.15	0.16, 176	0.25	18.6
Median		8.38	16.8	0.35, 0.20	0.40, 118	0.44	15.1