Thermographic determination of delamination depth in composites

Winfree, William P.; Zalameda, Joseph N.

doi:10.1117/12.485866

Cited by 26 publications

(21 citation statements)

References 4 publications

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“…The rest have lesser degrees of agreement, ranging from 0.55 to 0.72. These results are consistent with those from the conventional thermography technique applied to the same sample [7], but with greater errors, especially for the deeper delaminations.…”

Section: Resultssupporting

confidence: 81%

“…Since the configuration of interest is a composite with a delamination, the first and second layers are assumed to have the same thermal conductivity (K) and diffusivity (). For the surface with the incident heating, the Laplace transform of the temperature response is given by [7] …”

Section: Determination Of Delamination De Pth From the Theoretical Thmentioning

confidence: 99%

“…Of particular interest is the detection of delaminations that can appreciably reduce the compressive strength of a composite. Recently Winfree et al have successfully developed a physical model of two-layered systems for accurate reduction of the temporal thermal response of a composite with fabricated delaminations to the depths of the delaminations [7].…”

Section: Introductionmentioning

confidence: 99%

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Fiber Optic Thermographic Detection of Flaws in Composites

Wu¹,

Winfree²,

Thompson³

et al. 2010

AIP Conference Proceedings

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ABSTRACT. Optical fibers with multiple Bragg gratings bonded to surfaces of structures were used for thermographic detection of subsurface defects in structures. The investigated structures included a 10-ply composite specimen with subsurface delaminations of various sizes and depths. Both during and following the application of a thermal heat flux to the surface, the individual Bragg grating sensors measured the temporal and spatial temperature variations. The obtained data were analyzed with thermal modeling to reveal particular characteristics of the interested areas. These results were found to be consistent with the simulation results.

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Section: Resultssupporting

confidence: 81%

Section: Determination Of Delamination De Pth From the Theoretical Thmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fiber Optic Thermographic Detection of Flaws in Composites

Wu¹,

Winfree²,

Thompson³

et al. 2010

AIP Conference Proceedings

Self Cite

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show abstract

“…7, as has been used to create a set of eigenvectors to represent thermographic data [13,16] in a composite material.…”

Section: Quadrature Methods In One Dimensionmentioning

confidence: 99%

“…For flash thermography, it has been used extensively for simulating the thermal response of multilayer systems with and without contact resistances at the interfaces [11,12,13,14,15,16]. It has also been shown to be applicable for three dimensional configurations, in particular for delaminations in composites [17,18,19] by representing the temperature as a cosine series and solving for the coefficients.…”

Section: Introductionmentioning

confidence: 99%