Abstract
Off-axis creep strengths of notched plain woven fabric CFRP laminates under constant load conditions at 100℃ were examined, and phenomenological modeling of creep rupture strength of notched specimens were attempted. First, static tension tests were performed on notched specimens with four different fiber orientations to examine the notch size dependence as well as the fiber orientation dependence of of axis tensile strength. Then, off-axis creep rupture tests on notched specimens were performed for the four fiber orientations under constant tensile loading conditions at more than three stress levels. Test results showed that transient creep behavior was dominant until final rupture, regardless of fiber orientation and of notch size. The log-log plots of creep stress against the time to rupture were almost linear over the tested range of time. On the basis of these creep rupture data, a phenomenological creep rupture model was developed. It was elucidated that the creep damage mechanics model succeeded in adequately predicting the observed off-axis creep rupture time of the notched specimens.
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