Notch Behavior and Fatigue Life Predictions of Discontinuously Reinforced MMCs

[摘要] In this study, three notch geometries were assessed with different stress concentration factors. The severity of a notch increased with the stress concentration, hence the fatigue lives dramatically reduced due to increasing stress concentration factor. Fatigue life predictions for the notch geometries have been performed by using a critical strain life approach. It is shown that the model provides a reasonable fatigue life estimation for various notch geometries, volume fraction, and reinforcement particle size of the Al metal matrix composites. Typical crack initiation sites related with the particle clusters, large particles, and intermetallic particles. Although, crack propagation in the reinforced alloy occurred predominantly in the matrix material, SiC particles (SiCp) played a significant role in influencing the crack path.

[学科分类] 金属与冶金

[关键词] Keywords: MMCs;Fatigue;life prediction;notch behavior