7.12 Thermal Nondestructive Evaluation of Composite Materials and Structures

Shepard, Steven M.

doi:10.1016/b978-0-12-803581-8.10038-4

Cited by 3 publications

(2 citation statements)

References 39 publications

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“…Pulsed Thermography (PT) is a widely used technique for the Non-Destructive Testing and Evaluation (NDT&E) of advanced materials and structures [1][2][3][4][5]. Compared with other NDT&E technologies, this thermographic configuration presents remarkable benefits such as its rapid and simple implementation, its suitability for large-scale inspections and complex surface monitoring, as well as its contactless application requiring no physical contact to the material being inspected.…”

Section: Introductionmentioning

confidence: 99%

Depth Retrieval Procedures in Pulsed Thermography: Remarks in Time and Frequency Domain Analyses

Theodorakeas

Koui

2018

Applied Sciences

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Featured Application: The present study intends to show the potentiality of pulsed thermographic imaging to quantitatively characterise hidden defects in Carbon Fibre Reinforced Polymers. By comparing the performance of different depth retrieval procedures, it was possible to evaluate the produced depth estimation accuracy and to define the impact of different experimental and analysis parameters in quantitative analysis. Abstract:In the present study, a Carbon Fibre Reinforced Polymer (CFRP) sample of trapezoid shape, consisting of internal artificial delaminations of various sizes and depth locations, is investigated by means of optical pulsed thermography for the retrieval of quantitative depth information. The main objectives of this work are to evaluate the produced depth estimation accuracy from two contrast-based depth inversion procedures as well as to correlate the acquired results with characteristics such as the location and size of the detected features and with analysis parameters such as the selection of the sound area. Quantitative analysis is performed in both the temporal and frequency domains, utilising, respectively, the informative parameters of thermal contrast peak slope time and blind frequency. The two depth retrieval procedures are applied for the depth estimation of features ranging in size from 3 mm to 15 mm and in depth from 0.2 mm to 1 mm. The results of the present study showed that the two different analyses provided efficient depth estimations, with frequency domain analysis presenting a greater accuracy. Nevertheless, predicting errors were observed in both cases and the factors responsible for these errors are defined and discussed.

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Section: Introductionmentioning

confidence: 99%

Depth Retrieval Procedures in Pulsed Thermography: Remarks in Time and Frequency Domain Analyses

Theodorakeas

Koui

2018

Applied Sciences

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“…Most often, a fitted equation is a low-order polynomial or sum of exponential functions. [18] The method has been shown to have a significant effect on noise reduction and allows for the detection of deeper defects in materials. However, with a longer acquisition time, lateral diffusion may affect the quality of the fitting.…”

Section: Thermal Signal Reconstruction -Signal Processing Proceduresmentioning

confidence: 99%

Laser spot thermography and Pulse thermography – comparison of performance for non-destructive testing of composite structures

2023

IJM

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Laser spot thermography (LST) is a sub-domain method in active thermography that uses a laser as the heat source. The method allows for precise control of the beam shape, pulse duration, and delivered energy. Therefore, this technique can be applied, especially for delicate structures where testing conditions must be maintained precisely. The following work includes the introduction of a laser spot thermography technology demonstrator that was designed and constructed at AGH UST. The paper presents laser thermography laboratory experiments along with the developed procedure for automatic defect identification. The measurements were used to establish an automatic procedure and algorithm for automatic defect identification based on regression methods.

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Electrical/thermal conductivities of low-temperature sintered/Ag-decorated epoxy microspheres

Maroulas,

Dragatogiannis,

Kyritsis

et al. 2024

Materials Chemistry and Physics

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7.12 Thermal Nondestructive Evaluation of Composite Materials and Structures

Cited by 3 publications

References 39 publications

Depth Retrieval Procedures in Pulsed Thermography: Remarks in Time and Frequency Domain Analyses

Depth Retrieval Procedures in Pulsed Thermography: Remarks in Time and Frequency Domain Analyses

Laser spot thermography and Pulse thermography – comparison of performance for non-destructive testing of composite structures

Electrical/thermal conductivities of low-temperature sintered/Ag-decorated epoxy microspheres

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