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Journal ArticleDOI

Neurofuzzy modelling of moisture absorption kinetics and its effect on the mechanical properties of pineapple fibre-reinforced polypropylene composite

01 Mar 2020-Journal of Composite Materials (SAGE PublicationsSage UK: London, England)-Vol. 54, Iss: 7, pp 899-912
TL;DR: Natural fibres possess low density, less abrasiveness, good strength and sound absorption capacity and its significance lies in being renewable and biodegradable as mentioned in this paper, the mechanical characteristics and...
Abstract: Natural fibres possess low density, less abrasiveness, good strength and sound absorption capacity and its significance lies in being renewable and biodegradable. The mechanical characteristics and...
Citations
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Journal ArticleDOI
TL;DR: In this paper, the influence of leaf treatments on mechanical, physical and chemical properties and thermal stability of the gelatin/lotus leaf composites was analyzed, and it was found that longitudinal orientation delivered higher mechanical properties than that of the transverse and random orientation whether untreated or treated.
Abstract: The focus of this work was to analyze the influence of leaf treatments on mechanical, physical and chemical properties and thermal stability of the gelatin/lotus leaf composites. Lotus leaves were treated with drinking water at 95 °C for 5 min. The gelatin/untreated lotus leaf (referred to as GUL) and the gelatin/hot water treated lotus leaf (referred to as GHL) composites have been prepared by the compression molding technique. The composites have been investigated by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TAG), Scanning electron microscopy (SEM). Effect of the lotus leaf hand lay-up fiber orientation was studied for longitudinal, transverse and random orientation of the fibers. The tensile strength of gelatin/lotus leaf composites were influenced by the orientation of the fibers. It was found that longitudinal orientation delivered higher mechanical properties than that of the transverse and random orientation whether untreated or treated. The hot water modification of the lotus leaf was employed to improve the interfacial adhesion of the composites in order to improve the tensile properties. By using TGA analysis data and Ozawa-Flynn-Wall (OFW) method, the thermal stability and degradation temperature of the lotus leaves treated with hot water were higher than those of untreated leaves. In addition, the properties of the novel bio-composites were potential in further development of biodegradable packaging materials.

6 citations

Journal ArticleDOI
18 Oct 2021
TL;DR: The aim of this paper was to improve the performance of the adaptive neuro-fuzzy inference system (ANFIS) and to predict the flexural strength of the sandwich panels made with thin medium density fiberboard as surface layers, and polyurethane foam as a core layer, by applying metaheuristic optimization methods.
Abstract: The aim of this paper was to improve the performance of the adaptive neuro-fuzzy inference system (ANFIS) and to predict the flexural strength of the sandwich panels made with thin medium density fiberboard as surface layers, and polyurethane foam as a core layer, by applying metaheuristic optimization methods. For this purpose, various models, namely ant colony optimization for the continuous domain (ACOR), differential evolution (DE), genetic algorithm (GA), and particle swarm optimization (PSO) were applied and compared, as different efficient bio-inspired paradigms, to assess their suitability for training the adaptive neuro-fuzzy inference system model. The predicted values of the flexural strength resulting from applying adaptive neuro-fuzzy inference system trained by ACOR, DE, GA, and PSO, were compared with the values derived from adaptive neuro-fuzzy inference system classical model. The molar ratio of formaldehyde to melamine and urea, sandwich panel thickness, and the weight ratio of the modified starch to MUF resin (OS/MUF weight ratio) were used as an input variables and the modulus of rupture was used as an output one. The developed hybrid models were used to predict the values of the modulus of rupture obtained from experimental tests. In order to evaluate and compare the performance of the models, three performance criteria were employed namely, determination coefficient (R2), root mean square error, and mean absolute percentage error. It was found that ANFIS–ACOR, ANFIS–DE, ANFIS–GA, and ANFIS–PSO showed different performance ratios compared to the predicting model. In addition, the ANFIS–GA model is found to be by far more accurate than the other hybrid models.

4 citations

Book ChapterDOI
01 Jan 2022
TL;DR: In this paper , the works about processing, applications and water aging of completely biodegradable polymer composites were presented and the results derived from literature studies after water aging was stated.
Abstract: AbstractEmploying of biodegradable polymers and reinforcements for the development of composites is important for the reduction of environmental problems of non-biodegradable and petro-based polymers. Completely biodegradable composites (biocomposites, ecocomposites or green composites) are composed of natural fibers and natural matrices or synthetic biodegradable matrices. Completely biodegradable composites can replace synthetic fiber based composites due to excellent mechanical properties, low cost and low density. However, biodegradable composites have hydrophilic nature thus, tend to absorb a significant amount of moisture. Mechanical properties of biodegradable composites immersed in water degrade over time limiting the potential applications of these materials. Not only mechanical properties of biodegradable composites but also dimensions of biodegradable composites are affected by water content. Therefore, in this chapter, the works about processing, applications and water aging of completely biodegradable polymer composites were presented. Also, the results derived from literature studies after water aging of completely biodegradable polymer composites were stated.KeywordsBiodegradable compositeDegradationMoisture absorptionWater aging
References
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Journal ArticleDOI
TL;DR: In this article, a review paper deals with the mechanical properties evaluation of PALF and several factors influencing properties such as type of variety, fibre length, matrix type, fibre orientation, voids and porosity content.
Abstract: The environmental problems associated with the production, disposal and recycling of synthetic fibre based polymer composites has prompted the development of eco-friendly natural fibres. It involves use of kenaf, jute, oil palm, cotton, flax, banana, hemp, sisal and pineapple leaf fibre (PALF) for various applications such as automotive, infrastructure, biomedical, furniture, packaging etc. PALF will be important in material development for structural and non structural industrial products with other natural and synthetic fibres with different matrix. This review paper deals with the mechanical properties evaluation of PALF and several factors influencing properties such as type of variety, fibre length, matrix type, fibre orientation, voids and porosity content. Recent research in the advancement of mechanical properties of PALF as reinforcement in thermoset, thermoplastic and biodegradable resins are briefly provided. Attempts have been made to characterize PALF as a hybrid composite with other natural and synthetic fibres. Surface treatments to improve the interfacial and interphasial PALF - matrix interaction with consideration of coupling agents for mechanical strength improving requirements are discussed. Along with limitations, technical solutions to the traditional problems of natural fibre composite processing, tensile properties improvement, durability, thermal stability and interfacial incompatibility enhancement are discussed. Overall, this review article investigates highlights and identifies gaps in the earlier research work. It provides the resourceful tabulated data for continuing future research in various streams with PALF as reinforcement.

147 citations


"Neurofuzzy modelling of moisture ab..." refers background in this paper

  • ...The maintenance of structural integrity of the fibre mats by its weaving plays a crucial role in restricting the moisture flow across its length.(21) Due to the less moisture absorption and the uniform Figure 2....

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Journal ArticleDOI
TL;DR: In this paper, the influence of the fiber-matrix adhesion in jute fiber-reinforced polypropylene on the materials behavior under fatigue and impact loadings was investigated throughout this study.
Abstract: The influence of the fiber-matrix adhesion in jute fiber-reinforced polypropylene on the materials behavior under fatigue and impact loadings was investigated throughout this study. It was shown that a strong interface is connected with a higher dynamic modulus and reduction in stiffness degradation with increasing load cycles and applied maximum stresses. The specific damping capacity resulted in higher values for the composites with poor bonded fibers. Furthermore, the stronger fiber-matrix adhesion reduced the loss-energy by non-penetration impact tested composites with roughly 30%. Tests which were performed at different temperatures, showed higher loss energies for cold and warm test conditions compared with room temperature. Post-impact dynamic modulus after 5 impact events was roughly 40% and 30% lower for composites with poor and good fiber-matrix adhesion, respectively.

137 citations

Journal ArticleDOI
TL;DR: In this article, the effect of the filler volume fraction on the tensile behavior of injection-molded rice husk-filled polypropylene (RH-PP) composites was studied.
Abstract: The effect of the filler volume fraction on the tensile behavior of injection-molded rice husk-filled polypropylene (RH–PP) composites was studied. Hygrothermal aging behavior was also investigated by immersing the specimens in distilled water at 30 and 90°C. The kinetics of moisture absorption was studied from the amount of water uptake by specimens at regular interval times. It was found that the diffusion coefficient and the maximum moisture content are dependent on the filler volume fraction and the immersion temperatures. Incorporation of RH into the PP matrix has led to a significant improvement in the tensile modulus and a moderate improvement in the tensile strength. Elongation at break and energy at break, on the other hand, decreased drastically with the incorporation of the RH filler. The extent of deterioration incurred by hygrothermal aging was dependent on the immersion temperature. Both the tensile strength and tensile modulus deteriorated as a result of the combined effect of thermal aging and moisture attack. Furthermore, the tensile properties were not recovered upon redrying of the specimens. Scanning electron microscopy was used to investigate the mode of failure of the RH–PP composites. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 742–753, 2001

99 citations


"Neurofuzzy modelling of moisture ab..." refers background in this paper

  • ...The dimensional stability and the mechanical properties of a natural fibre/polymer composite degrade considerably due to the excessive water absorption by the fibres.(9,10,12) The incompatibility arises due to the hydrophilic nature of natural fibres and the hydrophobic nature of the thermoplastic resins leading to the need of a detailed investigation on the moisture absorption....

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  • ...Moisture absorption or penetration in a composite can happen through three different pathways – the water molecules may diffuse into the gaps of the interlinking chains of the polymer, the capillary transport at the interlinking of the fibre–matrix interface, seeping into the micro cracks of the polymer formed during the fabrication process.(9,10) Apart from diffusion, the other two later pathways mentioned can be controlled by an optimised fabrication process thereby effectively controlling the parameters affecting the process....

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Journal ArticleDOI
TL;DR: In this article, the authors studied the effect of pineapple leaf fiber reinforced phenolformaldehyde (PF) composites on the effective thermal conductivity and effective thermal diffusivity.
Abstract: Simultaneous measurment of effective thermal conductivity (λ) and effective thermal diffusivity (κ) of pineapple leaf fiber reinforced phenolformaldehyde (PF) composites have been studied by transient plane source (TPS) technique. The samples of different weight percentage typically (15, 20, 30, 40 and 50%) have been taken. It is found that of effective thermal conductivity and effective thermal diffusivity of the composites decrease, as compared with pure PF as the fraction of fiber loading increases. Using Y. Agari, model thermal conductivity of pure fiber is evaluated and compared with the thermal conductivity of fiber determined by extrapolated experimental value of composite. Also, we have compared the results of thermal conductivity of composites with two models (Rayleigh–Maxwell and Meredith–Tobias model). Good agreement between theoretical and experimental result has been found.

97 citations

Journal ArticleDOI
TL;DR: In this paper, the authors reported that the use of fibres from the pineapple leaf (PALF) to be an alternative natural acoustic material can achieve sound absorption coefficient of 0.9 on average above 1 kHz.

93 citations


"Neurofuzzy modelling of moisture ab..." refers background in this paper

  • ...The sound absorption capacity of the pineapple fibre was explored to find its potential application in acoustics.(5)...

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