Acoustic emission monitoring of damage in metal-matrix composites subjected to thermomechanical fatigue

摘要: Abstract Acoustic emission (AE) was monitored during thermomechanical fatigue (TMF) tests conducted on a silicon carbide fiber, titanium alloy matrix composite, SCS-6/TIMETAL®21S. The were stress-controlled with stress ratio of 0·1, and temperature cycled from 150 to 650°C. In-phase out-of-phase TMF cycling characterized by distinct AE behavior. rate fiber fractures as indicated in-phase much higher than cycling, correlating metallography micromechanics analyses which indicate that the is under cycling. fracture proportional maximum remained nearly constant most test. greater early well near end. also cyclic damage occurred initial loading.