Evaluating vibration assisted vacuum infusion processing of hexagonal boron nitride sheet modified carbon fabric/epoxy composites in terms of interlaminar shear strength and void content

Meier, Reinhold; Kahraman, İlhan; Seyhan, Abdullah Tuğrul; Zaremba, S.; Drechsler, Klaus

doi:10.1016/j.compscitech.2016.03.022

Cited by 30 publications

(34 citation statements)

References 14 publications

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“…This assures that the hybrid combination of both Gr and h‐BN leads to higher filler/matrix interfacial interaction that generates effective heat conductive pathways inside the epoxy matrix . However, there are some cracks and gaps presence, which are due to the organic‐inorganic nature of hybrid fillers and sample preparation errors . Further, silane functionalization of filler is required to increase the bonding with the epoxy matrix .…”

Section: Resultsmentioning

confidence: 93%

“…As evident from Figure , while increasing in the filler loading, TR of epoxy composite decreases, which causes an increase in the TC values. This is dependent on good interfacial interaction and continuous dispersion of hybrid fillers system inside the epoxy matrix . It can be seen that the TC of the hybrid (Gr/h‐BN/Ag) filler incorporated epoxy composite was six times greater than that of neat epoxy resin.…”

Section: Resultsmentioning

confidence: 99%

“…This may be due to the similar structure of h‐BN (ie, hexagonal shape) like Gr that enhances the interfacial bonding of Gr with matrix and metal surface and retard crack propagation while LSS testing . Further, higher dispersion of Gr particles without excess agglomeration and extra voids formation inside epoxy matrix takes place in spite of having higher viscosity at high filler concentration as shown in SEM graphs (Figure C) . But in the case of 20%Gr + 80%Ep adhesive due to lower viscosity at lower filler concentration, less voids or cracks are formed, which increase the bonding and/or interaction of Gr with metallic and aluminum surface.…”

Section: Resultsmentioning

confidence: 99%

“…Similar type of TC enhancement behavior is also observed by Mun et al, in which TC of expanded graphite ( k ~ 1500 W/mK) filled epoxy composite was further decreased by introduction of very low intrinsic TC silica ( k ~ 1.5 W/mK) filler inside composite although it has increased the adhesion strength. Meier et al also observed the same behavior …”

Section: Resultsmentioning

confidence: 99%

“…On the contrary, particles with more than one aspect ratio may affect the TC in a positive way. A high aspect ratio can favor the formation of conducting networks by lowering the percolation threshold and diminish the disadvantageous role of interfacial thermal resistance (TR) on the thermal transport . Similarly, in order to provide low bulk resistivity, high shear strength, and high reliability, silver‐based adhesive composites are used.…”

Section: Introductionmentioning

confidence: 99%

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Epoxy‐based composite adhesives: Effect of hybrid fillers on thermal conductivity, rheology, and lap shear strength

Kumar

Mishra

Sahoo

et al. 2019

Polymers for Advanced Techs

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Thermal management is an important parameter in an electronic packaging application. In this work, three different types of fillers such as natural graphite powder (Gr) of 50‐μm particle size, boron nitride powder (h‐BN) of 1‐μm size, and silver flakes (Ag) of 10‐μm particle size were used for thermal conductivity enhancement of neat epoxy resin. The thermal properties, rheology, and lap shear strength of the neat epoxy and its composite were investigated. The analysis showed that the loading of different wt% of Gr‐based fillers can effectively increase the thermal conductivity of the epoxy resin. It has also been observed that the thermal conductivity of the hybrid filler (Gr/h‐BN/Ag) reinforced epoxy adhesive composite increased six times greater than that of neat epoxy resin composite. Further, the viscosity of hybrid filler reinforced epoxy resin was found to be increased as compared with its virgin counterpart. The adhesive composite with optimized filler content was then subsequently subjected to determine single lap shear strength. The degree of filler dispersion and alignment in the matrix were determined by scanning electron microscopy (SEM) analysis.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Epoxy‐based composite adhesives: Effect of hybrid fillers on thermal conductivity, rheology, and lap shear strength

Kumar

Mishra

Sahoo

et al. 2019

Polymers for Advanced Techs

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Identification of voids and interlaminar shear strengths of polymer‐matrix composites by optical microscopy experiment and deep learning methodology

Luo

Zhang

Lei

et al. 2021

Polymers for Advanced Techs

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The internal void defects induced during the manufacturing process of polymer‐matrix composites can significantly degrade the mechanical properties of the composite, particularly the interlaminar shear strength (ILSS). In this study, we developed an innovative integrated methodology based on a deep learning semantic segmentation algorithm, named DeepLabV3+, and a theoretically driven equation to automatically identify voids in optical images and investigate the relationship between the microscopic voids and macroscopic ILSS parameters of the composite laminates. Results suggest that for the best fine‐tuned DeepLabV3+ framework, the corresponding mean pixel accuracy and intersection over union scores on the testing set were 99.84% and 90.82%, respectively, thereby indicating the potential of the generalized trained model. In addition, detailed experiments revealed that the proposed method can successfully obtain the ILSS values of laminates with different void contents. In addition, the ILSS values of the carbon/epoxy laminates decreased by approximately 27% with an increase in the void content from 0.07% to 3.14%.

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Ultrasonic mixing head for liquid composite molding: Process and material characteristics

et al. 2017

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Current thermosetting resin injection methods, especially those used for liquid composite molding processes, have in most cases remained incapable in terms of being environmentally friendly and cost‐effective at the same time. To help overcome these drawbacks, the use of a low‐pressure metering machine connected to a most recently developed ultrasonic mixing head is proposed in this study. The working principle of the system is based on benefitting from ultrasound induced acoustic cavitation effect to mix and heat the reactive thermosetting resins on line. The processing parameters of the proposed system investigated through the study include volume flow, resin temperature, counter pressure, amplitude and chamber volume. A commercially used static mixing head was used for the purpose of performance comparison. The experimental findings obtained were evaluated and discussed with emphasis being placed on the effectiveness of using an ultrasonic mixing head for liquid composite molding processes. It was found that mixing and heating the thermosetting resin systems in the ultrasonic mixing head is untroublesome and holds promise being replaced with a static mixing head in an affordable manner. POLYM. COMPOS., 39:3977–3985, 2018. © 2017 Society of Plastics Engineers

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Evaluating vibration assisted vacuum infusion processing of hexagonal boron nitride sheet modified carbon fabric/epoxy composites in terms of interlaminar shear strength and void content

Cited by 30 publications

References 14 publications

Epoxy‐based composite adhesives: Effect of hybrid fillers on thermal conductivity, rheology, and lap shear strength

Epoxy‐based composite adhesives: Effect of hybrid fillers on thermal conductivity, rheology, and lap shear strength

Identification of voids and interlaminar shear strengths of polymer‐matrix composites by optical microscopy experiment and deep learning methodology

Ultrasonic mixing head for liquid composite molding: Process and material characteristics

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