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Laser shearographic inspection for debonds in sprayed on foam insulation (sofi)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Simmons, S. Adams, F. W. Hooker, J. |
| Copyright Year | 1997 |
| Description | Preliminary results of shearographic inspections of the test panels simulating the Space Shuttle's external tank (ET) spray on foam insulation (SOFI) are presented. Debonding of SOFI may introduce flight debris that may damage the orbiter's thermal protection system (TPS) exposing the orbiter (as well as the ET) to thermal loading. It is estimated that 90 percent of the TPS damage on the orbiter's 'belly' results from debonded SOFI during ascent. A series of test panels were fabricated, with programmed debonds of different geometries and sizes, to determine the sensitivity of shearography as a function of debond size, SOFI thickness,'and vacuum excitation. Results show that a Probability of Detection (POD) of 0.95 or better can be expected for debonds with a diameter equal to the SOFI thickness as less than 0.4-psi pressure reduction. More testing will be required to validate the laser shearography imaging process for certifying its use in nondestructive evaluation (NDE) of Space Shuttle space flight components. |
| File Size | 5802755 |
| Page Count | 142 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19970016362 |
| Archival Resource Key | ark:/13960/t5q867t2b |
| Language | English |
| Publisher Date | 1997-03-01 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Insulation Nondestructive Tests Shearography Inspection Pressure Reduction Imaging Techniques Sprayers Space Shuttle Orbiters Foams Thickness External Tanks Thermal Protection Debonding Materials Laser Applications 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 |
