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On-orbit teflon(trademark) fep degradation
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hansen, Patricia A. Dever, Joyce A. Townsend, Jacqueline |
| Copyright Year | 1999 |
| Description | During the Hubble Space Telescope (HST) Second Servicing Mission (SM2), degradation of unsupported Teflon(trademark) FEP (fluorinated ethylene propylene), used as the outer layer of the multi-layer insulation (MLI) blankets, was evident as large cracks on the telescope light shield. A sample of the degraded outer layer was retrieved during the mission and returned to Earth for ground testing and evaluation. The results of the Teflon(trademark) FEP sample evaluation and additional testing of pristine Teflon FEP led the investigative team to theorize that the HST damage was caused by thermal cycling with deep-layer damage from electron and proton radiation which allowed the propagation of cracks along stress concentrations, and that the damage increased with the combined total dose of electrons, protons, UV and x-rays along with thermal cycling. This paper discusses the testing and evaluation of the Teflon(trademark) FEP. |
| File Size | 1086749 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19990040483 |
| Archival Resource Key | ark:/13960/t4pk5b386 |
| Language | English |
| Publisher Date | 1999-02-01 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Protons Scanning Electron Microscopy Environmental Tests Electron Radiation Cracks Ultraviolet Radiation X Rays Oxygen Atoms Hubble Space Telescope Radiation Shielding Optical Microscopes Multilayer Insulation Thermal Degradation Teflon Trademark Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
