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Structural tests on a tile/strain isolation pad thermal protection systemThe aluminum skin of the space shuttle is covered by a thermal protection system (TPS) consisting of a low density ceramic tile bonded to a matted-felt material called strain insulation pad (SIP). The structural characteristics of the TPS were studied experimentally under selected extreme load conditions. Three basic types of loads were imposed: tension, eccentrically applied tension, and combined in-plane force and transverse pressure. For some tests, transverse pressure was applied rapidly to simulate a transient shock wave passing over the tile. The failure mode for all specimens involved separation of the tile from the SIP at the silicone rubber bond interface. An eccentrically applied tension load caused the tile to separate from the SIP at loads lower than experienced at failure for pure tension loading. Moderate in-plane as well as shock loading did not cause a measurable reduction in the TPS ultimate failure strength. A strong coupling, however, was exhibited between in-plane and transverse loads and displacements.
Document ID
19800011819
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Williams, J. G. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
March 1, 1980
Subject Category
Space Transportation
Report/Patent Number
NASA-TM-80226
Accession Number
80N20302
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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