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Accelerated near-threshold fatigue crack growth behavior of an aluminum powder metallurgy alloy
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Piascik, Robert S. Newman, John A. |
| 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 DK, an abrupt acceleration in room temperature FCG rate occurs at high stress ratio (R = Kmin/Kmax). The near threshold accelerated FCG rates are exacerbated by increased levels of Kmax (Kmax less than 0.4 KIC). 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 Kmax influenced accelerated crack growth is time and temperature dependent. |
| File Size | 653182 |
| Page Count | 11 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20020052412 |
| Archival Resource Key | ark:/13960/t5dc30888 |
| Language | English |
| Publisher Date | 2002-05-01 |
| Access Restriction | Open |
| Subject Keyword | Metals And Metallic Materials Metal Fatigue Temperature Dependence Crack Tips Creep Properties Aluminum Alloys Powder Metallurgy Powdered Aluminum Stress Ratio Crack Propagation Damage Fracture Strength Fractography Room Temperature Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
