| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 781528 | International Journal of Fatigue | 2009 | 9 Pages |
Abstract
Fatigue crack growth (FCG) research conducted in the near-threshold regime has identified a room-temperature creep crack growth damage mechanism for a fine-grain powder-metallurgy aluminum alloy (8009). At very low ΔK, an abrupt acceleration in room-temperature FCG rate occurs at high stress ratio and is exacerbated by increased levels of Kmax (Kmax ⩾ 0.4KIc). Detailed crack-surface analysis correlates accelerated FCG with the formation of crack-tip process zone micro-void damage. Experimental results show that the near-threshold and Kmax influenced accelerated crack growth is time and temperature dependent.
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Authors
John A. Newman, Stephen W. Smith, Robert S. Piascik,