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Accelerated threshold fatigue crack growth effect-powder metallurgy aluminum alloy
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Newman, J. A. Piascik, R. S. |
| Copyright Year | 2002 |
| Description | 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 (PM) aluminum alloy (8009). At very low (Delta) K, an abrupt acceleration in room temperature FCG rate occurs at high stress ratio (R = K(sub min)/K(sub max)). The near threshold accelerated FCG rates are exacerbated by increased levels of K(sub max) (K(sub max) = 0.4 K(sub IC)). Detailed fractographic analysis correlates accelerated FCG with the formation of crack-tip process zone micro-void damage. Experimental results show that the near threshold and K(sub max) influenced accelerated crack growth is time and temperature dependent. |
| File Size | 470245 |
| Page Count | 8 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20030014978 |
| Archival Resource Key | ark:/13960/t7hq8wp5s |
| Language | English |
| Publisher Date | 2002-01-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Metal Fatigue Crack Tips Creep Properties Aluminum Alloys Powder Metallurgy Fractography Stress Ratio Crack Propagation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
