Abstract
The addition of Kaowool fibers substantially increases the fatigue strength of 339 aluminum at 300 °C. However, the fatigue life of these composites is limited by the presence of Kaowool “shot” particles, which act as crack initiation sites. An elastic analysis of the stress concentrations associated with this type of defect shows that a crucial parameter is the distance of the particle from the free surface. As the distance from the surface decreases, the stress concentration factor increases substantially and attains maximum value when a small portion of the particle has been removed by machining. The relationship between the distance from the surface and the stress concentration factor is in excellent agreement with the particle geometries observed at fatigue crack initiation sites.
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Baxter, W.J., Alostaz, A. & Jasiuk, I. The effect of shot particles on the fatigue of Kaowool fiber-reinforced 339 aluminum. Metall Mater Trans A 30, 195–201 (1999). https://doi.org/10.1007/s11661-999-0207-5
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DOI: https://doi.org/10.1007/s11661-999-0207-5