Determining the dimension of subsurface defects by active infrared thermography – experimental research

Gryś, S.

doi:10.5194/jsss-7-153-2018

Cited by 13 publications

(6 citation statements)

References 21 publications

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“…Reviewing techniques for determining defect lateral size is beyond the scope of this research; see [ 34 , 35 ]. In this study, the true defect dimensions were used as the mean values in the NLF algorithm within the ±10% interval.…”

Section: Resultsmentioning

confidence: 99%

Characterizing Depth of Defects with Low Size/Depth Aspect Ratio and Low Thermal Reflection by Using Pulsed IR Thermography

et al. 2021

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This study is focused on the quantitative estimation of defect depth by applying pulsed thermal nondestructive testing. The majority of known defect characterization techniques are based on 1D heat conduction solutions, thus being inappropriate for evaluating defects with low aspect ratios. A novel method for estimating defect depth is proposed by taking into account the phenomenon of 3D heat diffusion, finite lateral size of defects and the thermal reflection coefficient at the boundary between a host material and defects. The method is based on the combination of a known analytical model and a non-linear fitting (NLF) procedure. The algorithm was verified both numerically and experimentally on 3D-printed polylactic acid plastic samples. The accuracy of depth prediction using the proposed method was compared with the reference characterization technique based on thermographic signal reconstruction to demonstrate the efficiency of the proposed NLF method.

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Section: Resultsmentioning

confidence: 99%

Characterizing Depth of Defects with Low Size/Depth Aspect Ratio and Low Thermal Reflection by Using Pulsed IR Thermography

et al. 2021

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“…Cement mortar is relatively durable and robust, but has low flexibility. Therefore, structural cracking can be caused by differential movement of the support or by poor manufacturing (careless bleeding and segregation process) or by extreme temperature and humidity conditions [36,37].…”

Section: Digital Optical Microscopymentioning

confidence: 99%

Integration of NDT to Assess Composite Contemporary Artworks Made on Photosensitized Cement

Stamatopoulou,

Karoglou,

Bakolas

2023

Heritage

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Non-destructive techniques (NDT) have enhanced their usefulness in the field of cultural heritage protection and have become valuable tools for the investigation of composing materials, as well as for the detection of alteration and degradation of various structures. In the current study, non-destructive techniques, based on digital photography processing and analysis (digital photography-Vis/UVF, portable digital optical microscopy, colorimetry, infrared thermography), are used for the examination of three composite contemporary artworks created on photosensitized cement. This approach was applied to a series of composite works (photosensitized cement surfaces) in order to understand the craftmanship of the artist, document the materials used and assess the overall condition of the artworks. The techniques and methods applied can be used as a benchmark for the study of similarly complex artworks and for conservation and restoration planning. This comparative study has shown that, although the three artworks under examination are composed of alike materials (cement mortar, plaster, photosensitive emulsion), they exhibit distinct condition states, which can be attributed to variations in the artist technique and application, as well as to their exposure to different environmental conditions.

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“…Moreover, thermography monitoring system could be fully optimized in a manufacturing system when integrated with a robotic system (Khodayar et al, 2018). Thermography has performed as one of NDE techniques in research to detect and evaluate failure material on carbon reinforcement fiber (CFRP) to detect foreign inclusions and delamination or impact defect (Ekanayake et al, 2018;Grys, 2018;Saeed et al, 2018) or defect on bio composite material such as basalt fiber woven composites, aramid (Diharjo et al, 2013;Kalyanavalli et al, 2018) and kenaf (Bendada et al, 2013) had been done. Furthermore, Ultrasound NDE toolshave also been used to evaluate lightning damage on composite fibers and CFRP composite (Hirano et al, 2010), on Carbon Nanotube (Logakis and Skordos, 2012), and flax reinforcement fiber (Mat Daud et al, 2018).…”

Section: Impact and Lightning Defects In Composite Structure Materialsmentioning

confidence: 99%

Damage Identification on Impact and Lightning Damage of Flax Composite Laminates (Linum usitatissimum) Using Long-Pulse Thermography of a Low-Resolution Infrared Camera

et al. 2021

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The demand for composite fiber material is significantly high due to its excellent mechanical properties and its use in various industries. Recently, with the increasing awareness of environmental issues, researchers are now focusing more on eco-friendly and green materials. A biocomposite offers a good balance of strength and stiffness ratio, bending and membrane mechanical properties, balanced thermal distortion stability, reduced weight and cost, improved fatigue resistance, reduced notch sensitivity, and, comparatively, better performance than synthetic composites. Yet, due to the complex anisotropy of the composite material, the inspection and detection of inner defects become a challenge. Long-pulse thermography is one of the non-destructive evaluations (NDEs) used to detect defects in composite materials. However, very limited research has been carried out on the usage of a low-resolution infrared camera to perform defect or damage inspection on flax composite laminates. In this paper, an experimental setup of a long pulse thermography system using low-resolution infrared camera was performed on flax bio-composite to identify impact and lightning damage. The result highlights that with control parameters, a low-resolution infrared camera has the capability to capture the lightning and impact defects of flax biocomposites using the long-pulse thermography system. An image processing method is then applied to the defect to improve the quality of defect detection and reduce background noise.

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Determining the dimension of subsurface defects by active infrared thermography – experimental research

Cited by 13 publications

References 21 publications

Characterizing Depth of Defects with Low Size/Depth Aspect Ratio and Low Thermal Reflection by Using Pulsed IR Thermography

Characterizing Depth of Defects with Low Size/Depth Aspect Ratio and Low Thermal Reflection by Using Pulsed IR Thermography

Integration of NDT to Assess Composite Contemporary Artworks Made on Photosensitized Cement

Damage Identification on Impact and Lightning Damage of Flax Composite Laminates (Linum usitatissimum) Using Long-Pulse Thermography of a Low-Resolution Infrared Camera

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