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Fracture mechanics analysis of lh2 feed line flow liners
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Dawicke, David S. Harris, Charles E. Raju, Ivatury S. James, Mark A. Brzowski, Matthew B. Elliott, Kenny B. |
| Copyright Year | 2006 |
| Description | Inspections of the Space Shuttle Main Engine revealed fatigue cracks growing from slots in the flow liner of the liquid hydrogen (LH2) feed lines. During flight, the flow liners experience complex loading induced by flow of LH2 and the resonance characteristics of the structure. The flow liners are made of Inconel 718 and had previously not been considered a fracture critical component. However, fatigue failure of a flow liner could have catastrophic effect on the Shuttle engines. A fracture mechanics study was performed to determine if a damage tolerance approach to life management was possible and to determine the sensitivity to the load spectra, material properties, and crack size. The load spectra were derived separately from ground tests and material properties were obtained from coupon tests. The stress-intensity factors for the fatigue cracks were determined from a shell-dynamics approach that simulated the dominant resonant frequencies. Life predictions were obtained using the NASGRO life prediction code. The results indicated that adequate life could not be demonstrated for initial crack lengths of the size that could be detected by traditional NDE techniques. |
| File Size | 548649 |
| Page Count | 15 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20060020274 |
| Archival Resource Key | ark:/13960/t29936h8f |
| Language | English |
| Publisher Date | 2006-01-01 |
| Access Restriction | Open |
| Subject Keyword | Spacecraft Propulsion And Power Nondestructive Tests Fracture Mechanics Tolerances Mechanics Space Shuttle Main Engine Linings Inspection Liquid Hydrogen Failure Loads Forces 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 |
