Assessment and Response of Treated Cocos nucifera Reinforced Toughened Epoxy Composite Towards Fracture and Viscoelastic Properties

Kumar, Rahul; Kumar, K. Ashok; Bhowmik, Sumit

doi:10.1007/s10924-017-1150-y

Cited by 37 publications

(18 citation statements)

References 41 publications

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“…32 In general, the polymer curve undergoes through three distinct phases namely glassy region, transition region and the rubbery region. 5 After the glass transition temperature, curve enters the rubbery region where it is almost clearly depicts the glass transition temperature with an almost sharp peak.…”

Section: Storage Modulus (E')mentioning

confidence: 99%

“…Similarly with the use of wood filler in the epoxy polymer matrix to determine the tensile, fracture and dynamical mechanical characteristics improved with the filler addition. 5,8 Gouda et al determined the thermomechanical behavior of the hybrid filled reinforced polymer composite material. The hybrid polymer composite material was developed with incorporation of the chemically treated micro bamboo filler and graphene nanoplatelet with varied filler weight percentage.…”

Section: Introductionmentioning

confidence: 99%

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Influence of filler hybridization on thermomechanical properties of hemp/silver epoxy composite

Kumar

Gouda

et al. 2020

Polymers and Polymer Composites

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The polymer composite material’s thermomechanical properties with fiber as reinforcement material have been widely studied in the last few decades. However, these fiber-based polymer composites exhibit problems such as fiber orientation, delamination, fiber defect along the length and bonding are the matter of serious concern in order to improve the thermomechanical properties and obtain isotropic material behavior. In the present investigation filler-based composite material is developed using natural hemp and high thermal conductive silver nanoparticles (SNP) and combination of dual fillers in neat epoxy polymer to investigate the synergetic influence. Among various organic natural fillers hemp filler depicts good crystallinity characteristics, so selected as a biocompatible filler along with SNP conductive filler. For enhancing their thermal conductivity and mechanical properties, hybridization of hemp filler along with silver nanoparticles are conducted. The composites samples are prepared with three different combinations such as sole SNP, sole hemp and hybrid (SNP and hemp) are prepared to understand their solo and hybrid combination. From results it is examined that, chemical treated hemp filler has to maximized its relative properties and showed, 40% weight % of silver nanoparticles composites have highest thermal conductivity 1.00 W/mK followed with hemp filler 0.55 W/mK and hybrid 0.76 W/mK composites at 7.5% of weight fraction and 47.5% of weight fraction respectively. The highest tensile strength is obtained for SNP composite 32.03 MPa and highest young’s modulus is obtained for hybrid composites. Dynamic mechanical analysis is conducted to find their respective storage modulus and glass transition temperature and that, the recorded maximum for SNP composites with 3.23 GPa and 90°C respectively. Scanning electron microscopy examinations clearly illustrated that formation of thermal conductivity chain is significant with nano and micro fillers incorporation.

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Section: Storage Modulus (E')mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of filler hybridization on thermomechanical properties of hemp/silver epoxy composite

Kumar

Gouda

et al. 2020

Polymers and Polymer Composites

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“…The mixture containing hardener, epoxy, and pineapple leaf particulates was stirred for 8 to 10 min at 250 r/min and then put into vacuum desiccation for 15 to 20 min. 25 The desiccator aided in trapping the bubbles and air from the mixture. When the maximum bubbles were trapped out, the liquid mixture was poured into the silicon rubber mold.…”

Section: Preparation Of Fiber-reinforced Polymeric Composite (Frp)mentioning

confidence: 99%

Micro-mechanical analysis of the pineapple-reinforced polymeric composite by the inclusion of pineapple leaf particulates

Saha

Kumar

Zindani

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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The present study is focused on investigating the effect of the micro-mechanical properties of the natural fiber- (pineapple leaf fiber) reinforced polymeric composites by the addition of pineapple leaf micro-particulates. For the investigation, a two-step approach has been used. In the first step, finite element method-based analysis has been used to characterize the tensile and shear properties of the pineapple leaf fiber-reinforced polymeric composites (FRP) and pineapple paticulate-reinforced polymeric composites (PRC), and the adopted finite element method-based analysis has been validated through the experimental approach. In the second step, the validated finite element method-based analysis has been used to characterize the micro-mechanical properties of the hybrid fiber-reinforced polymeric composites (HFRP) fabricated using the pineapple leaf micro-particle embedded epoxy as a matrix material and the pineapple leaf fiber has been used as reinforcing material. It has been observed through the analysis that the micro-mechanical properties of HFRP were superior to that of FRP. There has been a 10.16% increment in Young’s modulus in the longitudinal direction and a 26.36% increment in Young’s modulus in the transverse direction for HFRP over FRP. Further, a 9.91% increment for in-plane shear modulus and 26.17% increment in outer-plane shear modulus have been observed for HFRP in comparison to FRP. These results suggest that pineapple leaf particulates are good reinforcing materials to enhance the transverse direction and outer plane micro-mechanical properties of the fiber-reinforced composite.

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“…The uneven particle sizes can result in micro-cracks and act as localized stress generators, initiating structural heterogeneities and the resulting failure of material [13,26]. The tensile strengths of coir filler composites, in general, were decreasing as the crosshead speed increases (strain rate increases) and crack blunting, crack pining, crack front-twisting contributed as fracture mechanism with micro-sized particle reinforcement [27]. Figure 3 shows the crack propagation behaviour due to the presence of unevenly sized filler which could cause the tensile properties unpredictable under various strain rates.…”

Section: Tensile Strain Ratementioning

confidence: 99%

A Review on Mechanical Properties of Natural Fibre Reinforced Polymer Composites under Various Strain Rates

et al. 2021

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With the lightning speed of technological evolution, the demand for high performance yet sustainable natural fibres reinforced polymer composites (NFPCs) are rising. Especially a mechanically competent NFPCs under various loading conditions are growing day by day. However, the polymers mechanical properties are strain-rate dependent due to their viscoelastic nature. Especially for natural fibre reinforced polymer composites (NFPCs) which the involvement of filler has caused rather complex failure mechanisms under different strain rates. Moreover, some uneven micro-sized natural fibres such as bagasse, coir and wood were found often resulting in micro-cracks and voids formation in composites. This paper provides an overview of recent research on the mechanical properties of NFPCs under various loading conditions-different form (tensile, compression, bending) and different strain rates. The literature on characterisation techniques toward different strain rates, composite failure behaviours and current challenges are summarised which have led to the notion of future study trend. The strength of NFPCs is generally found grow proportionally with the strain rate up to a certain degree depending on the fibre-matrix stress-transfer efficiency. The failure modes such as embrittlement and fibre-matrix debonding were often encountered at higher strain rates. The natural filler properties, amount, sizes and polymer matrix types are found to be few key factors affecting the performances of composites under various strain rates whereby optimally adjust these factors could maximise the fibre-matrix stress-transfer efficiency and led to performance increases under various loading strain rates.

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Assessment and Response of Treated Cocos nucifera Reinforced Toughened Epoxy Composite Towards Fracture and Viscoelastic Properties

Cited by 37 publications

References 41 publications

Influence of filler hybridization on thermomechanical properties of hemp/silver epoxy composite

Influence of filler hybridization on thermomechanical properties of hemp/silver epoxy composite

Micro-mechanical analysis of the pineapple-reinforced polymeric composite by the inclusion of pineapple leaf particulates

A Review on Mechanical Properties of Natural Fibre Reinforced Polymer Composites under Various Strain Rates

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