Estimation of delamination crack depth using passive thermography

Joseph N. Zalameda; Wade C. Jackson; Cheryl A. Rose

doi:10.1117/12.2520390

2 May 2019 Estimation of delamination crack depth using passive thermography

Joseph N. Zalameda, Wade C. Jackson, Cheryl A. Rose

Proceedings Volume 11004, Thermosense: Thermal Infrared Applications XLI; 110040E (2019) https://doi.org/10.1117/12.2520390
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

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.

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Citation Download Citation

Joseph N. Zalameda, Wade C. Jackson, and Cheryl A. Rose "Estimation of delamination crack depth using passive thermography", Proc. SPIE 11004, Thermosense: Thermal Infrared Applications XLI, 110040E (2 May 2019); https://doi.org/10.1117/12.2520390

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