Low-velocity impact studies on Kevlar/Epoxy composites reinforced with carboxyl functionalized Graphene

Sukanya, Nitin Mathusoothanaperumal; Suresh, S.

doi:10.1016/j.matpr.2022.06.393

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…The FL composites hold the highest strength (227.18 and 118.75 MPa) compared to FP (162.59 and 76.11 MPa), followed by FH (136.37 and 124.74 MPa), for three-layered and five-layered composites, respectively [ 42 ]. The high short beam strength of FL can be attributed to the smaller branches in the long polymer chains of polypropylene, which make for strong interaction with the hemicellulose bonding of flax structure via ß1,4 linkage [ 43 ]. These results are supported by the fiber adhesion strength, as shown in Table 5 .…”

Section: Resultsmentioning

confidence: 99%

Development of Lightweight Cricket Pads Using Knitted Flexible Thermoplastic Composites with Improved Impact Protection

et al. 2022

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Cricket is one of the most popular global sports, and cricket pads are important personal protective gear used for shock absorption and peak deceleration of the impact forces of the cricket ball for both batsmen and wicket keepers. The materials selection of the padding should be considered according to requirements. In the present study, flexible composites were manufactured using knitted unidirectional thermoplastic composite prepregs. Prepregs were fabricated using thermoplastic yarns, e.g., High Density Polyethylene (HDPE), Polypropylene (PP), and Low Melting Polyester (LMPE). Para-aramid (Kevlar) and Flax yarns were used as inlay. The structures were stacked in three and five layers, and hot compression was used to convert thermoplastic yarn into matrix. A total of twelve samples were prepared, and their mechanical properties were evaluated. Tensile and flexural properties, short beam strength, and impact properties were optimized using the multi-criteria decision-making (MCDM) technique for order performance by similarity to ideal solution (TOPSIS). This approach was used to select the best material for use in cricket pads. The candidate samples were ranked using statistical techniques. The optimum sample was found to be FP5, i.e., Flax with polypropylene using five layers, which exhibited the maximum impact strength. The results showed that the mechanical properties were improved in general by increasing the number of layers. The significance and percentage contribution of each factor was obtained by ANOVA (α = 0.10) and pie chart, which showed Factors A and C (inlay yarn and number of layers) to be the main contributors. The optimal samples showed superior impact-related performance compared to a market sample cricket pad.

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Section: Resultsmentioning

confidence: 99%

Development of Lightweight Cricket Pads Using Knitted Flexible Thermoplastic Composites with Improved Impact Protection

et al. 2022

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Direct Comparison of Low Velocity Impact Performance of Nanoclay, Boric Acid and Interlayer Hybrid Composites

Örçen,

Ünal,

Pekbey

2024

Polymers for Advanced Techs

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In this study, the low velocity impact effect of glass fiber‐reinforced laminated composites reinforced with nanoclay and boric acid was investigated. Nanoclay, boric acid, and interlayer hybrid composites were produced at 0 (pure), 0.5, 1, and 1.5 wt% with respect to epoxy resin. Laminated composites were obtained by the hand lay‐up method. Impact tests were applied to the specimens by releasing the weight. Tests were carried out with impact energies of 30, 40, 50, and 60 J to evaluate the behavior of composites under loading result in rebounding. Nano reinforcement generally increases the maximum reaction force while decreasing the impact duration, maximum displacement, and absorbed energy. As a result of all the tests performed, the reaction force increased up to 53% compared to the pure specimen, while the absorbed energy, impact duration, and maximum displacement values decreased up to 21%, 36%, and 12%, respectively. The results of the hybrid specimens in the interlayer sequence provided more changes compared to the mono‐reinforced specimens (i.e., nanoclay or boric acid). The hybrid specimen with a reinforcement ratio of 1.5 wt% impact face boric acid exhibited the greatest enhancement in impact resistance among all the tested specimens. The reaction force, which is an indicator of resistance, increased by 44%, 35%, 51% and 34% from energy level 30 to 60 J, respectively. Furthermore, the specimen exhibited the lowest values for absorbed energy, maximum displacement and impact duration.

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Agglomeration phenomenon in graphene/polymer nanocomposites: Reasons, roles, and remedies

Zeinedini,

Shokrieh

2024

Applied Physics Reviews

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The addition of low-loading content of nanofillers may improve the material properties of polymer-based nanocomposites. This improvement directly corresponds to the density of well-dispersed nanofillers in the matrix. However, for higher nanofiller loadings, the nanocomposites' material properties not only may not be improved but also may be degraded due to agglomeration. This complex phenomenon, where nanofillers tend to form agglomerates with the enhancement of volume fraction, poses significant challenges in materials science and nanotechnology. It has been proven that agglomerations hinder the performance of the nanocomposites and thwart the unique properties of nanofillers in most aspects. Graphene, one of the most used nanofillers, plays a remarkable role in nanotechnology. Therefore, the key focus of the current review is to provide insight into the impact of agglomeration on the various material properties such as tensile, flexural, fracture, fatigue, thermal, electrical, and barrier characteristics of the polymer nanocomposites reinforced by graphene-based structures. A comprehensive review of the factors leading to the agglomeration of graphene in the nanocomposites was presented. It was concluded that agglomeration could be a barrier to developing polymer-based nanocomposites, and the challenges of controlling the nanofiller agglomerations were discussed in depth, highlighting the issue's complexity.

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Low-velocity impact studies on Kevlar/Epoxy composites reinforced with carboxyl functionalized Graphene

Cited by 4 publications

References 12 publications

Development of Lightweight Cricket Pads Using Knitted Flexible Thermoplastic Composites with Improved Impact Protection

Development of Lightweight Cricket Pads Using Knitted Flexible Thermoplastic Composites with Improved Impact Protection

Direct Comparison of Low Velocity Impact Performance of Nanoclay, Boric Acid and Interlayer Hybrid Composites

Agglomeration phenomenon in graphene/polymer nanocomposites: Reasons, roles, and remedies

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