NDLI: Thermal excitation system for shearography (tess)

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Thermal excitation system for shearography (tess)

Content Provider	NASA Technical Reports Server (NTRS)
Author	Bullock, Michael W. Lansing, Matthew D.
Copyright Year	1996
Description	One of the most convenient and effective methods of stressing a part or structure for shearographic evaluation is thermal excitation. This technique involves heating the part, often convectively with a heat gun, and then monitoring with a shearography device the deformation during cooling. For a composite specimen, unbonds, delaminations, inclusions, or matrix cracking will deform during cooling differently than other more structurally sound regions and thus will appear as anomalies in the deformation field. However, one of the difficulties that cause this inspection to be dependent on the operator experience is the conventional heating process. Fanning the part with a heat gun by hand introduces a wide range of variability from person to person and from one inspection to the next. The goal of this research effort was to conduct research in the methods of thermal excitation for shearography inspection. A computerized heating system was developed for inspection of 0.61 m (24 in.) square panels. The Thermal Excitation System for Shearography (TESS) provides radiant heating with continuous digital measurement of the surface temperature profile to ensure repeatability. The TESS device functions as an accessory to any electronic shearography device.
File Size	1248502
Page Count	43
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19960054336
Archival Resource Key	ark:/13960/t10p60h6v
Language	English
Publisher Date	1996-07-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Temperature Measurement Nondestructive Tests Electronic Equipment Shearography Temperature Effects Digital Electronics Excitation Temperature Profiles Radiant Heating Stress Measurement 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

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