Font Size: 

Static tensile and tension-tension fatigue tests were conducted on 2.5D woven composites at room and elevated temperatures. Macro-Fracture morphology and SEM micrographs were examined to understand the corresponding failure mechanism. The results show that the stress-strain curves and the fractured morphology are significantly different in the room and elevated temperature environments. Furthermore, the static tensile properties decrease sharply with increasing the temperature due to the weakness of fiber/matrix interfacial adhesion. The fatigue life and damage progression at elevated temperature are also substantially different compared with those at room temperature. Meanwhile, a damage mechanism, called rotation deformation mechanism, was proposed to explain the elevated fatigue behavior.