The effect of fiber morphology on the tensile strength of natural fibers

Fidelis, Maria Ernestina Alves; Pereira, Thatiana Vitorino Castro; Gomes, Otávio da Fonseca Martins; Silva, Flávio de Andrade; Filho, Romildo Dias Toledo

doi:10.1016/j.jmrt.2013.02.003

Cited by 361 publications

(210 citation statements)

References 11 publications

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“…In this case, the fi ber bundles have a similar morphology to that of other plant fi bers, such as Agave sisalana (Alves-Fidelis et al, 2013) and A. tequilana (Kestur et al, 2013) because all of them are composed of many fi ber cells. Each fi ber cell is united by the middle lamella, which consists of cellulose and lignin, but they differ by factors such as the number of fi ber cells, the cell-wall size, the thickness of the secondary cell-walls, the real crosssection (the total area minus the lumen area), and the fi ber bundle cross-section area.…”

Section: Discussionmentioning

confidence: 84%

“…Knowledge of fi ber bundle length and width (diameter) is very important because it provides an indication of the possible strength properties of different types of natural fi bers (Alves-Fidelis et al, 2013). In this study, the fi ber bundles show a wide variability in length, which corresponds to the MARTIN HIDALGO-REYES ET AL.…”

Section: Discussionmentioning

confidence: 90%

“…Each fi ber cell is united by the middle lamella, which consists of cellulose and lignin, but they differ by factors such as the number of fi ber cells, the cell-wall size, the thickness of the secondary cell-walls, the real crosssection (the total area minus the lumen area), and the fi ber bundle cross-section area. According to Alves-Fidelis et al (2013), it is possible to correlate fi ber morphology with tensile strength properties. Thus, each fi ber bundle presents its own specifi c morphological characteristics and therefore its respective mechanical behavior.…”

Section: Discussionmentioning

confidence: 99%

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Chemical and morphological characterization of <em>Agave angustifolia</em> bagasse fibers

et al. 2015

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Abstract:The main aim of this study was to characterize cooked bagasse fi bers from Agave angustifolia Haw. The fi bers were characterized using scanning electron microscopy, differential scanning calorimetry, thermogravimetric analysis, X-ray Diffraction and chemical analysis. The tensile strength was also tested using fi bers with a uniform length (30 mm). The fi bers were light brown in color, with a mean diameter and length of 501 μm and 144 mm, respectively. Scanning electron microscopy images revealed elliptically shaped cells with varying lumen size. Holocellulose content was approximately 82.12 %, and total lignin content was approximately 20.69 %. Due to the crystallinity and lignin content, the fi bers proved to be thermo-stable until 220 °C.The mean values of tensile strength, Young's modulus, % strain (ε), and ultimate tensile strength were determined via mechanical tests. The results are comparable to those of other common lignocellulosic fi bers, confi rming their potential use as a reinforcing element in a polymer matrix to form a new biodegradable composite. Keywords: chemical composition, crystallinity, mechanical tests, morphology, thermal analysis Resumen: El objetivo principal de este estudio fue caracterizar las fi bras de bagazo cocido de Agave angustifolia Haw. Las fi bras fueron caracterizadas a través de microscopia electrónica de barrido, calorimetría diferencial de barrido, análisis termogravimétri-cos, difracción de rayos X y análisis químico. También se realizaron pruebas de resistencia a la tracción usando fi bras de longitud constante (30 mm). Las fi bras presentaron un color marrón claro, con diámetro medio de 501 μm y longitud media de 144 mm. Las imágenes del microscopio electrónico de barrido mostraron células de forma elíptica con diferente tamaño de lumen. El contenido de holocelulosa fue alrededor de 82.12 % y el contenido total de lignina de aproximadamente 20.69 %. La fi bra resultó ser térmicamente estable hasta 220 °C debido a la cristalinidad y el contenido de lignina. El esfuerzo de tensión, el módulo de Young, el porcentaje de deformación (ε) y el esfuerzo último de tensión fueron obtenidos de las pruebas mecánicas. Los resultados son comparables a los de otras fi bras lignocelulósicas comunes, lo cual confi rma que estas fi bras tienen potencial como refuerzo en una matriz polimérica para formar un nuevo compuesto biodegradable. Palabras clave: análisis térmico, composición química, cristalinidad, morfología, pruebas mecánicas. ETHNOBOTANY R ecently, research on plant fi bers has been increasing due to the abundance of these materials and their status as renewable resources (Joseph et al., 1999;Ghali et al., 2006;Lucena et al., 2009;Ku et al., 2011;Kestur et al., 2013). Consequently, this focus has led to further research on the specifi c characterization of individual plant fi bers such as bamboo, okra, sisal, and henequen (Mishra et al., 2004; Bé-akou et al., 2008;De Rosa et al., 2010;Liu et al., 2012;Arrakhiz et al., 2013) and studies on composite materials (Mohan...

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Section: Discussionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

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Chemical and morphological characterization of <em>Agave angustifolia</em> bagasse fibers

et al. 2015

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“…Sendo assim, o módulo de elasticidade da [1,11], como também em outras fibras naturais, como as de abacaxi [17] e de linho [18,19]. Entretanto, para fibras de coco da Índia, o comportamento observado é o contrário ao apresentado nesse estudo [16]. Apesar dessa influência, pode ser relatado que à partir de 300 µm de diâmetro houve convergência da resistência à tração e do módulo inicial para valores mais estáveis na ordem de 20 a 60 MPa e 1 a 3 GPa, respectivamente.…”

Section: Comportamento Mecânicounclassified

Comportamento Morfológico E Mecânico De Fibras De Coco Tratadas Superficialmente E De Mantas De Fibra De Coco

Rios¹,

Júnior²,

Lima³

et al. 2018

ABM Proceedings

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ResumoNeste estudo, caracterizações morfológicas e mecânicas foram utilizadas em fibras de coco brasileiras na condição como recebida e tratadas superficialmente (por NaOH, aquecidas e por NaOH seguido de aquecimento) e em mantas de fibras de coco fabricadas por compressão. Para a análise morfológica foi utilizada a Microscopia Eletrônica de Varredura (MEV) e para a análise mecânica foi utilizado o ensaio de tração uniaxial. As análises por MEV apresentaram que as fibras tratadas por NaOH possuem paredes celulares externas mais nítidas e partículas circulares com diâmetros de aproximadamente 10 μm. O tratamento químico alterou a parede externa das fibras de coco; em uma das amostras foram vistas microtrincas da ordem de 7 a 60 µm em virtude do tratamento seguido de aquecimento. O módulo inicial (módulo de elasticidade) e a tensão de ruptura diminuíram com o aumento de diâmetro nas quatro condições de fibras de coco estudadas. A geometria e a massa da manta de fibra de coco influenciaram no seu comportamento mecânico. Palavras-chave: Fibra de coco; Comportamento morfológico; Comportamento mecânico. MORPHOLOGICAL AND MECHANICAL BEHAVIOR OF COCONUT FIBERS TREATED SUPERFICIALLY AND COCONUT FIBERS MATS AbstractNatural fibers has recently gained attention due to low environmental impact, low cost and easy availability. Morphological and mechanical investigations on Brazilian coconut fibers in four different surface conditions (as received; dried; chemically treated by NaOH; chemically treated by NaOH followed by heating) and coconut fiber mats manufactured by compression were used in this study. Scanning Electron Microscopy (SEM) were used to morphological analysis and in-situ mechanical testing uniaxial traction were used. SEM analysis showed the chemically treated coconut fibers have sharper external cell walls and circular particles with diameters of approximately 10 µm. Chemical treatment altered the external wall of coconut fibers; on one of the samples were seen microcracks order 7 to 60 µm due to the treatment followed by heating. The initial modulus (modulus of elasticity) and tensile strength decreased with increasing diameter for the four conditions of coconut fibers. The geometry and the weight of the coconut fiber mats influenced their mechanical behavior.

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“…The variability of a material characteristic it can be described by using Weibull distribution function [1] which cover a large scale of application, such as: fatigue performance [2,3,4], scatter of fracture toughness [5], probabilistic characterization in different static tests up to failure (four-point bending [6] or tensile test [7]). …”

Section: Introductionmentioning

confidence: 99%