High Temperature Low Cycle Fatigue of a SiC/Ti Matrix Composite
Low cycle fatigue studies have been conducted on SiC continuous fiber reinforced Ti-6Al-4V in air at temperatures up to 500 °C. Through the use of beachmarks and fatigue striations, the progress of the crack front could be retraced using the scanning electron microscope. The results of these morphological studies indicate that during crack propagation, the crack bows out between the fibers analogous to dislocation bowing. At higher temperature there is an increased tendency for interlaminar cracking and the appearance of stepped crack surfaces. These observations have important consequences in the development of fracture mechanics models for MMC life prediction.
KeywordsCrack Front Linear Elastic Fracture Mechanic Life Prediction Fatigue Striation Fracture Mechanic Model
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