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Thermographic nondestructive evaluation: data inversion procedures. Part II: 2-D analysis and experimental results

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1080/09349849109409505
AuthorSearch for: 1; Search for: 1; Search for: 1
Affiliation
  1. National Research Council of Canada
FormatText, Article
Subjectthermal resistance; nondestructive evaluation; lateral size; defect depth; artificial defect
Abstract
In Part I of this paper, a one-dimensional procedure was described for nondestructive thermographic evaluation. In Part II, a two-dimensional approach is presented to retrieve the subsurface defect depth, lateral size, and thermal resistance from the time-variable surface temperature distribution as recorded by a thermographic camera. The algorithm performance is tested on experimental data obtained under transient lateral-scanning surface heating conditions on a variety of artificial defects including bottom-open cavities of different geometries as well as Teflon™ implants in CFRP plates. In general, the defect depth and lateral size are inferred with satisfactory accuracy. The thermal resistance inferred through our inversion routine in the artificial delamination case was always higher than the incremental resistance due to the implants, suggesting the presence of resistive interfaces between the inclusions and the host material. Assuming a constant relative contrast error, the precision on the defect thermal resistance decreases as the defect resistance and depth/lateral size ratio increase.
Publication date
PublisherTaylor and Francis
In
  • Research in Nondestructive Evaluation 3, no. 2: 101–124.
LanguageEnglish
Peer reviewedYes
NRC numberCNRC 33757
NRC-IMI92AP-12100-1319-G
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Record identifier5af4d861-d8a3-4bf7-9590-c5ca2987399b
Record created2020-05-26
Record modified2020-05-26
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