Location of crack closure and the fatigue threshold condition in 7150 aluminum alloy
Conference
·
· TMS (The Metallurgical Society) Paper Selection; (USA)
OSTI ID:5367138
- Univ. of California, Berkeley (USA)
A study has been performed on under-, peak- and overaged structures in a I/M 7150 aluminum alloy to investigate the distribution of crack closure along the length of fatigue cracks at the threshold {Delta}K{sub TH} condition. By micro-machining of material in the wake of the crack tip, it is shown that previously arrested cracks can commence to propagate at {Delta}K{sub TH}. Further, by monitoring the closure during the micro-machining process, it can be shown that over 50% of the closure is within 1 mm of the crack tip. Such phenomena are discussed in terms of the various micro-mechanisms of closure which predominate in the three microstructural conditions.
- OSTI ID:
- 5367138
- Report Number(s):
- CONF-840909--
- Conference Information:
- Journal Name: TMS (The Metallurgical Society) Paper Selection; (USA) Journal Volume: 56
- Country of Publication:
- United States
- Language:
- English
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