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Proceedings Paper

Estimation of delamination crack depth using passive thermography
Author(s): Joseph N. Zalameda; Wade C. Jackson; Cheryl A. Rose
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Paper Abstract

Passive thermography is used to monitor small increases in temperature resulting from delamination damage formation in a composite hat-stiffened panel during quasi-static loading. The heating is composed of two heat generation components. The first component is an instantaneous response due to a strain release during quasi-static loading. The second component is mechanical heating, at the interface of failure, due to fracture damage. This second component produces a transient rise in temperature that is a function of the damage depth and thermal diffusivity. The first component defines the thermal start time for the transient response. A one-dimensional thermal model is used to determine the damage depth. The results are compared to ultrasonic and X-ray CT data. The advantages and limitations of the thermal technique for damage depth detection are discussed.

Paper Details

Date Published: 2 May 2019
PDF: 8 pages
Proc. SPIE 11004, Thermosense: Thermal Infrared Applications XLI, 110040E (2 May 2019); doi: 10.1117/12.2520390
Show Author Affiliations
Joseph N. Zalameda, NASA Langley Research Ctr. (United States)
Wade C. Jackson, NASA Langley Research Ctr. (United States)
Cheryl A. Rose, NASA Langley Research Ctr. (United States)

Published in SPIE Proceedings Vol. 11004:
Thermosense: Thermal Infrared Applications XLI
Jaap de Vries; Beate Oswald-Tranta, Editor(s)

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