Interfacial Studies of Natural Fiber-Reinforced Particulate Thermoplastic Composites and Their Mechanical Properties

Verma, Deepak; Goh, Kheng Lim; Vimal, Vrince

doi:10.1080/15440478.2020.1808147

Cited by 22 publications

(22 citation statements)

References 92 publications

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“…[21][22][23][24] However, once the model is confirmed to be representative of the experiment (e.g., in terms of number of breaks at saturation), it can be used to study many aspects of the problem (i.e., stress distributions, fibre break statistics etc.). The value (for the critical fracture energy of the interface) arrived at by enforcing agreement of number of breaks at saturation was 2.9 J/m 2 (Table 3) which is within the experimental range of values determined in Varna et al 51…”

Section: Interface Behavioursupporting

confidence: 85%

Finite element modelling of the single fibre composite fragmentation test with comparison to experiments

Cao

Yang

Harrison

et al. 2022

Journal of Composite Materials

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This paper develops a finite element (FE) model of the single fibre fragmentation test designed for direct comparison with experimental results on an E-glass/epoxy system by McCarthy et al. (2015). Interface behaviour is modelled via a cohesive surface, and stochastic Weibull fibre strengths (determined by independent experiments) assigned at random to the elements along the fibre. Predictions from the model agree with experiment for a range of outputs: The evolution of the number of fibre breaks with strain is similar and breaks occur at random locations as required. The model also captures a transition to a Uniform (rather than Weibull) statistical distribution of break locations at later stages of the test consistent with recent experiments. The evolution of the cumulative distribution of fragment lengths is also similar to that of the experiment. In addition, fibre axial stress and interfacial shear stress distributions conform with experimental observation. Correct model predictions of break locations confirm the approach taken on assigning stochastic (Weibull) strengths along the fibre. The effectiveness of the FE model in capturing a number of key aspects of the fragmentation phenomenon suggest its usefulness as a tool in analysing and interpreting fibre fragmentation tests, including back-calculation of interfacial shear strength.

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Section: Interface Behavioursupporting

confidence: 85%

Finite element modelling of the single fibre composite fragmentation test with comparison to experiments

Cao

Yang

Harrison

et al. 2022

Journal of Composite Materials

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“…Different studies have been conducted to improve the performance of NFC and determine the relation between composite properties with respect to fiber length, shape and, most importantly, interfacial adhesion with different matrices [ 7 , 8 ]. Natural fibers surface treatment using solution [ 5 ], silane coupling agents [ 7 ] and impregnation [ 8 ] can increase the interactions between the fillers and polymers to more efficiently transfer the applied loads and improve the NFC strength. Chimeni et al [ 5 ] investigates hemp surface modifications using mercerization and maleated polyethylene (MAPE) treatment methods to improve interfacial bonding of hemp with linear medium density polyethylene (LMDPE).…”

Section: Introductionmentioning

confidence: 99%

“…This is why cost effective and environmentally friendly solutions to improve the compatibility between each phases in biocomposites must be investigated [ 1 , 9 ]. Once good adhesion is obtained, fiber addition results in higher tensile and flexural rigidity (modulus and strength), while a noticeable drop of elasticity and impact strength eventually leads to brittle NFC [ 7 ]. For example, Kazemi et al [ 10 ] investigated the effect of wood sawdust addition to a recycled (post-consumer) polyethylene (PE)/polypropylene (PP) blend and observed substantial increase (15%) in the tensile modulus of the composite (265 to 305 MPa) upon addition of 20 wt.% natural fibers.…”

Section: Introductionmentioning

confidence: 99%

Recycled HDPE/Natural Fiber Composites Modified with Waste Tire Rubber: A Comparison between Injection and Compression Molding

2022

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With the objective of turning wastes into added-value materials, sustainable and fully recycled wood-plastic composites were reinforced by waste tire rubber particles to show balanced properties and potentially low-cost materials. Recycled high density polyethylene (rHDPE) was compounded (melt extrusion) with flax fiber (FF) and waste regenerated tire rubber (RR) to investigate the effect of mixing ratio, coupling agent (maleated polyethylene, MAPE) and molding process (injection and compression molding) on the properties of hybrid composites. In particular, a complete set of characterization was performed including thermal stability, phase morphology and mechanical properties in terms of tension, flexion and impact, as well as hardness and density. Adding 40 wt.% of flax fibers (FF) increased the tensile (17%) and flexural (15%) modulus of rHDPE, while the impact strength decreased by 58%. Substitution of FF by waste rubber particles improved by 75% the impact strength due to the elasticity and energy absorption of the rubber phase. The effects of impact modification were more pronounced for rHDPE/(FF/RR) compatibilized with MAPE (10 wt.%) due to highly improved interfacial adhesion and compatibility. The results also suggest that, for a fixed hybrid composition (FF/RR, 25/55 wt.%), the injection molded composites have a more homogenous morphology with a uniform distribution of well embedded reinforcements in the matrix. This better morphology produced higher tensile strain at break (12%) and impact strength (9%) compared to compression molded samples.

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“…The surface treatment of NFs to enhance adhesion between the NF and the polymer matrix underpins an important concept in the stress transfer mechanism [34]. The presence of strong adhesion can generate stresses at the interface by the process of 'shear lag', and this enables elastic stress transfer to occur between the NF and the matrix [35,36].…”

Section: Mercerization/alkali Surface Treatment: An Effective Way For Natural Fibre Surface Treatmentmentioning

confidence: 99%

Effect of Mercerization/Alkali Surface Treatment of Natural Fibres and Their Utilization in Polymer Composites: Mechanical and Morphological Studies

Verma

Goh

2021

J. Compos. Sci.

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Environmental pollution, such as air, water, and soil pollution, has become the most serious issue. Soil pollution is a major concern as it generally affects the lands and makes them non-fertile. The main cause of soil pollution is agro-waste. It may be possible to mitigate the agro-waste pollution by re-utilizing this agro-waste, namely natural fibres (NFs), by blending into polymer-based material to reinforce the polymer composite. However, there are pros and cons to this approach. Consequently, the polymer composite materials fabricated using NFs are inferior to those polymer composites that are reinforced by, e.g., carbon or glass fibres from the mechanical properties’ perspectives. The limitations of utilizing natural fibres in polymer matrix are their high moisture absorption, resulting in high swelling rate and degradation, inferior resistance to fire and chemical, and inferior mechanical properties. In particular, the NF polymer composites exhibit inferior interfacial adhesion between the fibre and the matrix, which, if improved, ultimately overcome all the listed limitations and improve the mechanical properties of the developed composites. To improve the interfacial adhesion leading to the enhancement of the mechanical properties, optimum chemical treatment such as Alkalization/Mercerization of the fibres have been explored. This article discusses the Mercerization/Alkali surface treatment method for NFs and its effects on the fibres regarding the Mercerization/Alkali surface treatment method for NFs and its effect on the fibres regarding their utilization in the polymer composites, the morphological features, and mechanical properties of composites.

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Interfacial Studies of Natural Fiber-Reinforced Particulate Thermoplastic Composites and Their Mechanical Properties

Cited by 22 publications

References 92 publications

Finite element modelling of the single fibre composite fragmentation test with comparison to experiments

Finite element modelling of the single fibre composite fragmentation test with comparison to experiments

Recycled HDPE/Natural Fiber Composites Modified with Waste Tire Rubber: A Comparison between Injection and Compression Molding

Effect of Mercerization/Alkali Surface Treatment of Natural Fibres and Their Utilization in Polymer Composites: Mechanical and Morphological Studies

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