Propagation and non-propagation of fatigue cracks in notched specimens of SiC particulate reinforced aluminum alloy
- Nagoya Univ. (Japan). Dept. of Mechanical Engineering
- Kawasaki Heavy Industries, Ltd., Akashi (Japan)
The propagation behavior of short fatigue cracks emanating from a sharp notch in an aluminum alloy (2024-T6) reinforced with 20 volume percent of SiC particles was investigated from a viewpoint of crack closure. The propagation rate, dc/dN, of short cracks was higher than that predicted using the dc/dN-{Delta}K relation for long cracks. The relation between dc/dN and the effective stress intensity range, {Delta}K{sub eff}, for short cracks at notches was identical to that obtained for long cracks. When compared at the same {Delta}K{sub eff}, dc/dN was lower in the reinforced material than in the unreinforced material. The relation between dc/dN and {Delta}K{sub eff}/E (E = Young`s modulus) was nearly identical for the reinforced and unreinforced materials.
- OSTI ID:
- 191359
- Report Number(s):
- CONF-950740--; ISBN 0-7918-1337-1
- Country of Publication:
- United States
- Language:
- English
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