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Fatique crack growth behavior of a single crystal alloy as observed through an in situ fatigue loading stage
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Telesman, Jack Kantzos, Peter |
| Copyright Year | 1988 |
| Description | An in situ fatigue loading stage inside a scanning electron microscope (SEM) was used to determine the fatigue crack growth behavior of a PWA 1480 single-crystal nickel-based superalloy. The loading stage permits real-time viewing of the fatigue damage processes at high magnification. The PWA 1480 single-crystal, single-edge notch specimens were tested with the load axis parallel to the (100) orientation. Two distinct fatigue failure mechanisms were identified. The crack growth rate differed substantially when the failure occurred on a single slip system in comparison to multislip system failure. Two processes by which crack branching is produced were identified and are discussed. Also discussed are the observed crack closure mechanisms. |
| File Size | 16938372 |
| Page Count | 18 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19880013602 |
| Archival Resource Key | ark:/13960/t3227sz14 |
| Language | English |
| Publisher Date | 1988-01-01 |
| Access Restriction | Open |
| Subject Keyword | Metallic Materials Crystal Lattices Failure Modes Electron Microscopes Notch Tests Crack Closure Real Time Operation Crack Propagation Single Crystals Heat Resistant Alloys Fatigue Materials Nickel Damage Magnification Loads Forces Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
