Nowadays in industries, especially in aerospace industries life prediction method is based on fracture mechanics. In the fracture mechanics model, it is expected that an initial crack which grows from voids exists in the specimen. CT specimens are made of Al6061-graphite particulate composites with 9 % of graphite reinforcement. For the same composition, three different orientations are considered with B = 10 mm, W = 40 mm to estimate the fatigue crack growth rate, and to study the fatigue life cycle through the stress-life cycle. The threshold value for Al6061-9% graphite at an R = 0.1 is found to be between 3.5 to 3.75 MPa√m. From the trend of the stress-life cycle curve, it is clear that the fatigue life of the composite achieves the level of 105 when the stress amplitude is lower than 250 MPa.
Keywords: Al6061-graphite composites, FCGR, S-N curve, CT specimens