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Crack initiation and growth in rigid polymeric closed-cell foam cryogenic applications
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Wells, Doug Steeve, Brian Sayyah, Tarek |
| Copyright Year | 2006 |
| Description | Cryogenic vessels, such as the Space Shuttle External Tank, are often insulated with closed-cell foam because of its low thermal conductivity. The coefficient of thermal expansion mismatch between the foam and metallic substrate places the foam under a biaxial tension gradient through the foam thickness. The total foam thickness affects the slope of the stress gradient and is considered a significant contributor to the initiation of subsurface cracks. Rigid polymeric foams are brittle in nature and any subsurface cracks tend to propagate a finite distance toward the surface. This presentation investigates the relationship between foam thickness and crack initiation and subsequent crack growth, using linear elastic fracture mechanics, in a rigid polymeric closed-cell foam through analysis and comparison with experimental results. |
| File Size | 7592208 |
| Page Count | 21 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20060047452 |
| Archival Resource Key | ark:/13960/t37131p4k |
| Language | English |
| Publisher Date | 2006-01-01 |
| Access Restriction | Open |
| Subject Keyword | Spacecraft Design, Testing And Performance Foams Slopes Thermal Expansion External Tanks Fracture Mechanics Stress Distribution Space Shuttles Cryogenics Low Conductivity Substrates Crack Initiation 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 |
