NDT characterisation of carbon-fibre and glass-fibre composites using non-invasive imaging techniques

Avdelidis, Nicolas P.; Ibarra‐Castanedo, Clemente; Theodorakeas, Panagiotis; Bendada, A.; Saarimäki, Eetta; Kauppinen, Timo; Koui, Maria

doi:10.21611/qirt.2010.008

Cited by 4 publications

(4 citation statements)

References 6 publications

(6 reference statements)

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“…This is a result of the advances in thermographic imaging technology that have orientated the analysis to the independent spatial and/or temporal treatment of each pixel of the thermal images' sequence, along with the development and use of advanced signal processing techniques [8,9]. Signal processing techniques have been developed for the interpretation of infrared thermographic data, targeting the defect detectability enhancement and noise reduction on the final imaging output, while the importance of these processing tools is also devoted to the preparation of data for the continuation to the phase of quantitative characterisation [10,11].…”

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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“…The temperature distribution was measured with the infrared camera while the specimen was heated by a halogen lamp 15 .…”

Section: Measurement Of Artefact Planementioning

confidence: 99%

A Study on the Nondestructive Evaluation of Carbon/Carbon Brake Disks Using Infrared Thermography

Shin

Pyo

Lee

et al. 2014

Polymers and Polymer Composites

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Carbon/carbon brake disks that use carbon fibers impregnated in a carbon matrix are widely utilized in aircrafts and automobiles owing to their high strength, high heat conductivity, low density, and excellent overall mechanical properties. Carbon/carbon brake disks are high cost products and require multi-process manufacturing. The safety and material efficiency of defective products reduces significantly and nondestructive testing is required to monitor the quality, homogeneity, and integrity of the material. In general, radiographic evaluations pose safety problems owing to the use of radiation in such evaluations and ultrasonic flaw detection is difficult to use because of its dependence on the surface of the specimen. This study uses an infrared thermography camera technique, which is not influenced by the sample surface, to monitor the heterogeneity of materials during the manufacturing process and to thus prove the reliability of the method.

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“…In other cases, usually flat bottom holes and step wedges are used. Further reference test specimen for fibre reinforced composites and aerospace components (honeycomb structure) specimen are described in [16] and [17], respectively. Here, more complex structures including flat bottom holes, impact damages, delaminations, cells filled with water etc.…”

Section: Reference Test Specimenmentioning

confidence: 99%

Development of reference test specimens for the standardisation of active thermography with flash excitation

Maierhofer¹,

Reischel²,

Steinfurth³

et al. 2012

Proceedings of the 2012 International Conference on Quantitative InfraRed Thermography

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In this paper, results of a project concerning the development of a testing standard for active thermography with flash excitation are presented. In addition to the standardisation of the appropriate selection of equipment and procedures for testing and data analysis, the standard will describe suitable reference test specimens. These test specimens can be used for the qualification of the equipment as well as for the validation of the method including data processing concerning different areas of application.

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NDT characterisation of carbon-fibre and glass-fibre composites using non-invasive imaging techniques

Cited by 4 publications

References 6 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

A Study on the Nondestructive Evaluation of Carbon/Carbon Brake Disks Using Infrared Thermography

Development of reference test specimens for the standardisation of active thermography with flash excitation

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