On the temperatures developed in CFRP drilling using uncoated WC-Co tools Part II: Nanomechanical study of thermally aged CFRP composites

Merino-Pérez, Julián Luis; Hodzic, A.; Merson, Eleanor; Ayvar-Soberanis, Sabino

doi:10.1016/j.compstruct.2014.12.035

Cited by 21 publications

(9 citation statements)

References 22 publications

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“…Furthermore, CF E r mean value was reduced by 5.5 GPa, even though the matrix phase did not demonstrate any drop in modulus; changes in values did not exceed the standard deviation. Thus, the decrement in nanomechanical properties was related to interface/interphase damages due to the propagation of multiple ageing reactions that weakened the composite, namely, chain rapture of the fiber-matrix bond, oxidation, and UV-and thermo-lysis, due to ageing-induced heat fluctuation by weathering as reported in literature [24,42]. Otherwise, the mean value of CF phase would have been higher, if the crosslinked interphase network was not affected.…”

Section: Effect Of Modification and Weathering-mapping Of Nanomechanical Propertiesmentioning

confidence: 67%

Carbon Fiber Reinforced Composites: Study of Modification Effect on Weathering-Induced Ageing via Nanoindentation and Deep Learning

Konstantopoulos

Semitekolos

Koumoulos³

et al. 2021

Nanomaterials

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The exposure of carbon-fiber-reinforced polymers (CFRPs) to open-field conditions was investigated. Establishment of structure–property relations with nanoindentation enabled the observation of modification effects on carbon-fiber interfaces, and impact resistance. Mapping of nanomechanical properties was performed using expectation-maximization optimization of Gaussian fitting for each CFRPs microstructure (matrix, interface, carbon fiber), while Weibull analysis connected the weathering effect to the statistically representative behavior of the produced composites. Plasma modification demonstrated reduced defect density and improved nanomechanical properties after weathering. Artificial intelligence for anomaly detection provided insights on condition monitoring of CFRPs. Deep-learning neural networks with three hidden layers were used to model the resistance to plastic deformation based on nanoindentation parameters. This study provides new assessment insights in composite engineering and quality assurance, especially during exposure under service conditions.

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Section: Effect Of Modification and Weathering-mapping Of Nanomechanical Propertiesmentioning

confidence: 67%

Carbon Fiber Reinforced Composites: Study of Modification Effect on Weathering-Induced Ageing via Nanoindentation and Deep Learning

Konstantopoulos

Semitekolos

Koumoulos³

et al. 2021

Nanomaterials

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“…On the contrary, when the intumescent paint with thicknesses of 10.0, 13.5 and 16.5 mm is applied, the temperature is almost stagnant until 7, 13, 15 min, respectively. In general, it was reported that the decomposition of the epoxy resin in CFRP occurs around 350e360 C (620e630 K) [19,20]. Thus, the whole resin in the bare tank (open triangle and blue dotted line (in the web version)), without thermal protection, will almost completely degrade before 15 min.…”

Section: Intumescent Paint Model Validationmentioning

confidence: 99%

Modelling heat transfer in an intumescent paint and its effect on fire resistance of on-board hydrogen storage

Kim

Makarov

Kashkarov

et al. 2017

International Journal of Hydrogen Energy

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This paper describes a 1-D numerical model for the prediction of heat and mass transfer through an intumescent paint that is applied to an on-board high-pressure GH2 storage tank. The intumescent paint is treated as a composite system, consisting of three general components, decomposing in accordance with independent finite reaction rates. A moving mesh, that is employed for a better prediction of the expansion process of the intumescent paint, is based on the local changes of heat and mass. The numerical model is validated against experiments by Cagliostro et al. (1975). The overall model results are used to estimate effect of intumescent paint on fire resistance of carbon-fibre reinforced GH2 storage.

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“…Conclusiones similares fueron obtenidas por un estudio más reciente de Merino-Pérez et al [88], midiendo la temperatura con termopares y cámara infrarroja. En otro estudio de Merino-Pérez et al [89] se analiza la degradación térmica sufrida por la matriz de CFRP.…”

Section: Monitorización Del Procesounclassified

Combined analysis of wear mechanisms and delamination in CFRP drilling

Fernández-Pérez

Díaz-Álvarez

Miguélez

et al. 2021

Composite Structures

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Drilling operations have a huge impact of time and cost on aircraft structures manufacturing and assembly processes, owing to the big volume of mechanical joints used, the complexity of the machining operation and the quality standards required.In this industry, composite materials are used extensively, mainly, Carbon Fiber Reinforced Plastics (CFRPs), which stand out by their excellent specific mechanical properties and good fatigue and corrosion resistance. The material removal process is characterized by intermittent fracture of the fibers and oscillation of the cutting forces. Furthermore, the drill bits suffer a severe tool wear produced by the abrasiveness and hardness of the carbon fibers.A mi familia, por encima de todo, siempre. GRACIAS xiii Contenidos publicados y presentadosAquí se recoge una lista de artículos u otras contribuciones que han sido incluidas como parte de la tesis. Todo el material de estas fuentes incluido en el documento está señalado por medios tipográficos y una referencia explícita. Publicaciones indexadas • J. Fernández-Pérez et al. "Influence of cutting parameters on tool wear and hole quality in composite aerospace components drilling". In: Composite Structures 178 (2017), pp. 157-161.

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On the temperatures developed in CFRP drilling using uncoated WC-Co tools Part II: Nanomechanical study of thermally aged CFRP composites

Cited by 21 publications

References 22 publications

Carbon Fiber Reinforced Composites: Study of Modification Effect on Weathering-Induced Ageing via Nanoindentation and Deep Learning

Carbon Fiber Reinforced Composites: Study of Modification Effect on Weathering-Induced Ageing via Nanoindentation and Deep Learning

Modelling heat transfer in an intumescent paint and its effect on fire resistance of on-board hydrogen storage

Combined analysis of wear mechanisms and delamination in CFRP drilling

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