Abstract
The stress rupture and tensile strength of unidirectional CFRP (T700SC⁄Epoxy) have been investigated experimentally. The stress rupture data revealed that (1) the difference of the maximum rupture time and the minimum rupture time in the same test load condition is more than 40, 000 hours, (2) the relationship of the test load condition and rupture time is unclear, and (3) origin of failure as stress corrosion does not exist on the surface of carbon fiber after the test. These results imply that CFRP is less susceptible to stress rupture. The tensile strength data revealed that the tensile strength in CFRP can be obtained on the basis use of the weakest link model. The method of calculation of the expectation burst pressure of the CFRP composite vessel in consideration of the length dependency of CFRP has been proposed.
