Abstract
Creep rupture behavior of a unidirectional T800H/Epoxy composite under constant load conditions at different temperatures is examined. Tensile creep rupture tests are performed at different stress levels on plain coupon specimens with various fiber orientations θ=0, 10, 30, 45, 90°. Transient creep behavior is dominant for all the fiber orientations, and ultimate creep rupture takes place along reinforcing fibers regardless of fiber orientation and test temperature. A creep damage mechanics model is then developed for describing anisotropic creep rupture behavior at different temperatures. The proposed model can adequately describe the directional and temperature-dependent off-axis creep rupture behavior of the unidirectional composite. Another creep rupture model that is formulated using the Larson and Miller parameter also succeeds in predicting the off-axis creep rupture behavior.
