Damage tolerance of few-layer graphene modified CFRP: From thin-to thick-ply laminates

Körbelin, Johann; Kötter, Benedikt; Voormann, Hauke; Brandenburg, Lukas; Selz, Stefan; Fiedler, Bodo

doi:10.1016/j.compscitech.2021.108765

Cited by 13 publications

(4 citation statements)

References 70 publications

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“…It can be observed that the surface of filler-added composites exhibited a more irregular and rougher surface with increasing the GnPs content. The presence of the GnPs helped to play a role in reducing the stress concentration at the crack initiation site, allowing for higher amount of energy to be absorbed via plastic deformation [31]. On the other hand, agglomeration of the GnPs prevented the penetration of the resin and sufficient wetting of the fiber, as evidenced by the severe fiber-matrix debonding and fiber splitting, as shown in Figure 4d.…”

Section: Sem Observationsmentioning

confidence: 99%

Improvements in Mechanical and Shape-Memory Properties of Bio-Based Composite: Effects of Adding Carbon Fiber and Graphene Nanoparticles

Luengrojanakul,

Mora,

Bunyanuwat

et al. 2023

Polymers

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Shape-memory carbon fiber (CF) polymer composites reinforced with graphene nanoplatelets (GnPs) as a filler based on a bio-based V-fa/ECO copolymer were prepared at different graphene GnPs and CF mass fractions using the hand lay-up and hot-pressing methods. The obtained composite specimens were subjected to flexural, dynamic mechanical, and shape-memory analyses. The obtained results revealed that the flexural strength and modulus were improved by the addition of the GnPs and CF due to the improvement in the interfacial adhesion and fiber reinforcement with up to 3 wt.% GnPs and 60 wt.% CF. Additionally, appreciable improvements in the shape-memory performance were achieved with the addition of the GnPs, where values of up to 93% and 96% were recorded for the shape fixity and recovery, respectively. The shape-memory performance was affected by the fiber mass fraction, with the composites retaining the shape-memory effect albeit with a significant drop in performance at higher fiber mass fractions. Lastly, the specimens at 40 wt.% CF and 3 wt.% GnPs were determined to be the optimum compositions for the best performance of the bio-based SMP composite.

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Section: Sem Observationsmentioning

confidence: 99%

Improvements in Mechanical and Shape-Memory Properties of Bio-Based Composite: Effects of Adding Carbon Fiber and Graphene Nanoparticles

Luengrojanakul,

Mora,

Bunyanuwat

et al. 2023

Polymers

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“…The sizing solutions developed within this work were water dispersions with solids (HP2-06 solids and CNTs and/or FLGs). Based on previous results and the literature review [23][24][25], a nanomaterial content of 0.05, 0.1, and 0.25% wt with total solid contents (HP2-06 solids + CNTs/FLGs) of 1, 2.5, and 5% wt were examined. To produce steady aqueous solutions with HP2-06 and CNTs/FLGs, the addition of surfactants along with a sonication process had to take place.…”

Section: Solid Content Concentrationmentioning

confidence: 99%

Nanomaterial-Enhanced Sizings: Design and Optimisation of a Pilot-Scale Fibre Sizing Line

Semitekolos,

Papadopoulos,

Anagnou

et al. 2024

Fibers

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This study focuses on the development of a pilot-scale sizing line, including its initial design and installation, operational phases, and optimization of key process parameters. The primary objective is the identification of critical parameters for achieving a uniform sizing onto the fibres and the determination of optimal conditions for maximum production efficiency. This investigation focused on adjusting the furnace desizing temperature for the removal of commercial sizing, adjusting the drying temperature, as well as optimizing the corresponding residence time of carbon fibres passing through the furnaces. The highest production rate, reaching 1 m sized carbon fibres per minute, was achieved by employing a desizing temperature of 550 °C, a drying temperature of 250 °C, and a residence time of 1 min. Furthermore, a range of sizing solutions was investigated and formulated, exploring carbon-based nanomaterial types with different surface functionalizations and concentrations, to evaluate their impact on the surface morphology and mechanical properties of carbon fibres. In-depth analyses, including scanning electron microscopy and contact angle goniometry, revealed the achievement of a uniform coating on the carbon fibre surface, leading to an enhanced affinity between fibres and the polymeric epoxy matrix. The incorporation of nanomaterials, specifically N2-plasma-functionalized carbon nanotubes and few-layer graphene, demonstrated notable improvements in the interfacial shear properties (90% increase), verified by mechanical and push-out tests.

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“…All the linear fits were implemented in Figure 10, after the derivation of the equations. The compressive strength of a composite is linearly dependent on the shear modulus of the matrix material, which is linearly dependent on the testing temperature; therefore, a linear function was used as a possible fit [41]. For a more general approach the equations were formulated using Kelvin instead of Celsius.…”

Section: Numerical Descriptionmentioning

confidence: 99%

Effect of Fiber Misalignment and Environmental Temperature on the Compressive Behavior of Fiber Composites

Drummer,

Tafesh,

Fiedler

2023

Polymers

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This experimental study investigated how defects, in particular fiber misalignment, affect the mechanical behavior of glass fiber composites (GFRP) under compressive loading. GFRP cross-plies with three different types of fiber misalignment, namely a fold, a wave, and an in-plane undulation, were fabricated using the resin transfer molding process. The compressive tests were performed at four different temperatures, in order to investigate the role of a change in the matrix properties on the strength of the composite. The experiments showed that the defects, especially at lower temperatures, had a significant impact on the mechanical properties of the composite, exceeding the proportion of the defects inside the composite. With increasing temperature, the damage mechanism changed from fiber-dominated to matrix-dominated and, in doing so, decreased the significance of fiber misalignment for the mechanical behavior.

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Damage tolerance of few-layer graphene modified CFRP: From thin-to thick-ply laminates

Cited by 13 publications

References 70 publications

Improvements in Mechanical and Shape-Memory Properties of Bio-Based Composite: Effects of Adding Carbon Fiber and Graphene Nanoparticles

Improvements in Mechanical and Shape-Memory Properties of Bio-Based Composite: Effects of Adding Carbon Fiber and Graphene Nanoparticles

Nanomaterial-Enhanced Sizings: Design and Optimisation of a Pilot-Scale Fibre Sizing Line

Effect of Fiber Misalignment and Environmental Temperature on the Compressive Behavior of Fiber Composites

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