Effects of defects in series production of hybrid CFRP lightweight components – detection and evaluation of quality critical characteristics

Berger, Dietrich; Brabandt, Daniel; Bakir, Can; Hornung, Tim; Lanza, Gisela; Summa, Jannik; Schwarz, Michael; Herrmann, Hans–Georg; Pohl, M.; Stommel, Markus

doi:10.1016/j.measurement.2016.10.003

Cited by 23 publications

(12 citation statements)

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“…Camera housing serves as a heat exchanger and reaches a temperature about 40 °C which can be seen as a reflection on a cold sample. The sample is a 2.5-dimensional CFRP because it consists of a metal-polymer insert that is placed in between CFRP layers during Resin Transfer Moulding Process [7]. Several examples for experimental results of non-destructive testing situations are given in this paper.…”

Section: Methodsmentioning

confidence: 99%

Combining the spectral information of Dual-Band images to enhance contrast and reveal details

Quirin¹,

Herrmann²

2018

Proceedings of the 2018 International Conference on Quantitative InfraRed Thermography

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A method to calculate an emissivity image out of two thermographic images taken at different wavelengths has been developed. Main part is a thermal pixel to pixel calibration to make measurements physically comparable. The new image shows enhanced contrast in several nondestructive testing situations and reveals details that could not be accessed in the input images. Examples for passive and active thermography are presented using an infrared dual-band camera working simultaneously in the MWIR and LWIR band. Reflection characteristics of CFRP and its components apparent in thermography have been compared with reflectance spectroscopy measurements.

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Section: Methodsmentioning

confidence: 99%

Combining the spectral information of Dual-Band images to enhance contrast and reveal details

Quirin¹,

Herrmann²

2018

Proceedings of the 2018 International Conference on Quantitative InfraRed Thermography

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“…Low earth orbit (LEO) geostationary satellites can experience temperatures as low as

in the eclipse region (Earth’s shadow), and up to 150

in the sunlight region (i.e., temperature range approaching 300

), so that repeated thermal shocks can still worsen the conditions faced by composite laminates permanently exposed to low-energy impact events by micrometeoroids [ 4 , 5 , 6 ]. Therefore, non-destructive testing and evaluation (NDT&E) techniques are essential to ensure structural safety, reliability, and operational life [ 7 , 8 , 9 , 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

A Deep Learning Method for the Impact Damage Segmentation of Curve-Shaped CFRP Specimens Inspected by Infrared Thermography

Wei

Fernandes

Herrmann

et al. 2021

Sensors

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Advanced materials such as continuous carbon fiber-reinforced thermoplastic (CFRP) laminates are commonly used in many industries, mainly because of their strength, stiffness to weight ratio, toughness, weldability, and repairability. Structural components working in harsh environments such as satellites are permanently exposed to some sort of damage during their lifetimes. To detect and characterize these damages, non-destructive testing and evaluation techniques are essential tools, especially for composite materials. In this study, artificial intelligence was applied in combination with infrared thermography to detected and segment impact damage on curved laminates that were previously submitted to a severe thermal stress cycles and subsequent ballistic impacts. Segmentation was performed on both mid-wave and long-wave infrared sequences obtained simultaneously during pulsed thermography experiments by means of a deep neural network. A deep neural network was trained for each wavelength. Both networks generated satisfactory results. The model trained with mid-wave images achieved an F1-score of 92.74% and the model trained with long-wave images achieved an F1-score of 87.39%.

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“…Carbon fiber-reinforced polymers (CFRPs) are lightweight continuous carbon fiber composite materials that show high strength [1,2,3]. In addition to their excellent mechanical performance [4,5], they offer the potential to replace heavy metals because of their high corrosion resistance [6].…”

Section: Introductionmentioning

confidence: 99%

Improving the Vertical Thermal Conductivity of Carbon Fiber-Reinforced Epoxy Composites by Forming Layer-by-Layer Contact of Inorganic Crystals

et al. 2019

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A carbon fiber-reinforced polymer (CFRP) is a light and rigid composite applicable in various fields, such as in aviation and automobile industry. However, due to its low thermal conductivity, it does not dissipate heat sufficiently and thus accumulates heat stress. Here, we reported a facile and effective strategy to improve the through-thickness thermal conductivity of CFRP composites by using a layer-by-layer coating of inorganic crystals. They could provide efficient heat transfer pathways through layer-by-layer contact within the resulting composite material. The high thermally conductive CFRP composites were prepared by employing three types of inorganic crystal fillers composed of aluminum, magnesium, and copper on prepreg through the layer-by-layer coating process. The vertical thermal conductivity of pure CFRP was increased by up to 87% on using magnesium filler at a very low content of 0.01 wt %. It was also confirmed that the higher the thermal conductivity enhancement was, the better were the mechanical properties. Thus, we could demonstrate that the layer-by-layer inclusion of inorganic crystals can lead to improved through-thickness thermal conductivity and mechanical properties of composites, which might find applications in varied industrial fields.

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Effects of defects in series production of hybrid CFRP lightweight components – detection and evaluation of quality critical characteristics

Cited by 23 publications

References 0 publications

Combining the spectral information of Dual-Band images to enhance contrast and reveal details

Combining the spectral information of Dual-Band images to enhance contrast and reveal details

A Deep Learning Method for the Impact Damage Segmentation of Curve-Shaped CFRP Specimens Inspected by Infrared Thermography

Improving the Vertical Thermal Conductivity of Carbon Fiber-Reinforced Epoxy Composites by Forming Layer-by-Layer Contact of Inorganic Crystals

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