Table 2.

Correspondence between degradation period and stretch ratio ($\overline{x}\pm s,n=5$).

Degradation period t/T f	Average circumferential stress of intima ${\overline{\sigma }}_{\theta \theta }$/MPa	Average circumferential strain of intima ${\overline{\epsilon }}_{\theta \theta }$/%	Stretch ratio/%
0	0.363 ± 0.004	13.1 ± 0.213	15
0.3	0.304 ± 0.003	11.7 ± 0.141	10
0.6	0.247 ± 0.002	9.6 ± 0.075
0.9	0.137 ± 0.002	5.5 ± 0.061	5