Role of microcracks in high cycle fatigue damage of an Al-SiC composite
- GE Corporate Research and Development, Schenectady, NY (United States). Physical Metallurgy Lab.
- Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering
Advanced Al-SiC composites are considered potential candidates for replacing monolithic metals in high cycle fatigue (HCF) applications such as aircraft wing skins and automotive engine connecting rods. To assess their aptitude in such instances, this study examines the role of microcracks in the HCF damage and critical crack formation process of a X2080 Al-15 vol.% SiC{sub p} composite. Microcracks are important in fatigue since their growth (or lack of growth) greatly determines fatigue strength. In the low cycle fatigue (LCF) of this Al-SiC composite, the microcrack regime can dominate for over 60% of the fatigue life. In HCF, while this is still often the case and microcracks can initiate within the first 10% of the life, most arrest immediately and microcrack development can exceed 70% of the life. These and other characteristics of microcrack growth in HCF such as the growth rates, coalescence, critical crack formation, and instability will be discussed in comparison to similar examinations made under LCF conditions. These results will emphasize the significance of microcracks when designing for fatigue strength and reliability inspectability in HCF.
- OSTI ID:
- 293107
- Report Number(s):
- CONF-970980-; ISBN 0-87339-382-1; TRN: IM9902%%122
- Resource Relation:
- Conference: Materials Week `97, Indianapolis, IN (United States), 14-18 Sep 1997; Other Information: PBD: 1997; Related Information: Is Part Of High cycle fatigue of structural materials. Proceedings; Soboyejo, W.O. [ed.] [Ohio State Univ., Columbus, OH (United States). Dept. of Materials Science and Engineering]; Srivatsan, T.S. [ed.] [Univ. of Akron, OH (United States). Dept. of Mechanical Engineering]; PB: 618 p.
- Country of Publication:
- United States
- Language:
- English
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