Validation of Laser Shearography Testing for Fixed Foam Insulation Bonds
Electronic Laser Shearography is a relatively new Nondestructive Evaluation (NDE) technique that is used with excitation methods to measure differential displacements and subsequent strains at the surface of a material. Laser shearography was evaluated as an NDE technique for the inspection of adhesive bonds on fixed foam insulation for Atlas-Centaur cryogenic fuel tanks. A test program was conducted which evaluated the capability of electronic laser shearography to detect disbonds under field conditions on a full scale development test article. The test program validated laser shearography as a viable technique for the inspection of adhesive bonds in the test article configuration.
KeywordsTest Article Acoustic Excitation Excitation Method Foam Insulation Moire Interferometry
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- 1.Bakke, V.R., Gruszczynski, M.J., Design Evaluation Test for Fixed Foam Insulation System, General Dynamics Space Systems Divsion, Report No. GDSS–853–0–88–315.Google Scholar
- 2.Burleigh, D., Engel, J., NDT Of an Adhesively Bonded Fixed Foam Insulation for Atlas/Centaur Cryogenic Fuel Tanks, NASA Houston NDE Conference, May 1989.Google Scholar
- 3.Das-Gupta, D.K., Electronic Speckle Shearing in the Detection of Delamination in Composite Materials, SPIE, Vol. 805 Optical Components and Systems, 1987,pp. 144–151.Google Scholar
- 4.Hung, Y.Y., Shearography: A New Optical Method-for Strain Measurement and Non-Destructive Testing, Optical Engineering, May/June 1982, pp. 391–395.Google Scholar
- 5.Newman, J.W., Production and Field Inspection of Advanced Materials with Holographic and Speckle Interferometry, SPIE, Vol 814, Photomechanics and Speckle Metrology, 1987, pp 421–427.Google Scholar