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Creep rupture behavior of a unidirectional carbon/epoxy T800H/Epoxy Laminate under constant off-axis loading conditions at different temperatures of 60, 100 and 130°C is examined. Tensile creep rupture tests are performed on plain coupon specimens with different fiber orientations θ=0, 10, 30, 45 and 90°. Creep rupture of specimens takes place predominantly along reinforcing fibers is a brittle manner, regardless of the fiber orientation. The log-log plots of the creep rupture data can approximately be described using straight lines with negative slopes over the range of rupture time up to 10h, regardless of the fiber orientation. Then, two kinds of simple phenomenological models are developed for predicting the time-to-failure of unidirectional composites. Validities of those models are evaluated by comparing with experimental results. It is demonstrated that the proposed models succeed in adequately predicting the creep rupture lives of the unidirectional composite at different temperatures.

Off-Axis Tensile Creep Rupture Behavior of a Unidirectional CFRP Laminate at High Temperatures