NDLI: Shearographic non-destructive evaluation of space shuttle thermal protection systems

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Shearographic non-destructive evaluation of space shuttle thermal protection systems

Content Provider	NASA Technical Reports Server (NTRS)
Author	Hooker, Jeffery A. Simmons, Stephen A. Davis, Christopher K. Tenbusch, Kenneth E.
Copyright Year	1995
Description	Preliminary results of shearographic inspections of the shuttle external tank (ET) spray-on foam insulation (SOFI) and solid rocket booster (SRB) Marshall sprayable ablative (MSA-2) epoxy-cork thermal protection systems (TPS) are presented. Debonding SOFI or MSA-2 damage the orbiter 'belly' tile and exposes the ET/SRB to thermal loading. Previous work with the ET/SRB showed promising results with shearography. The first area investigated was the jack pad close-out, one of many areas on the ET where foam is applied at KSC. Voids 0.375 inch were detected in 1.75 inch thick foam using a pressure reduction of less than 0.4 psi. Of primary interest are areas of the ET that directly face the orbiter tile TPS. It is estimated that 90% of tile TPS damage on the orbiter 'belly' results from debonding SOFI during ascent. Test panels modeling these areas were manufactured with programmed debonds to determine the sensitivity of shearography as a function of debond size, SOFI thickness and vacuum. Results show repeatable detection of debonds with a diameter approximately half the SOFI thickness at less than 0.4 psi pressure reduction. Preliminary results are also presented on inspections of MSA-2 and the remote manipulator system (RMS) honeycomb material.
File Size	625722
Page Count	10
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19970001776
Archival Resource Key	ark:/13960/t2h75bp69
Language	English
Publisher Date	1995-01-01
Access Restriction	Open
Subject Keyword	Sprayed Coatings Nondestructive Tests Shearography Space Shuttles Ablation Space Shuttle Boosters Foams External Tanks Thermal Protection Debonding Materials Remote Manipulator System Launching Pads Ground Support Equipment Honeycomb Structures Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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