Mechanical behaviour of coir fibres under tensile load

Kulkarni, A. G.; Satyanarayana, K. G.; Sukumaran, K.; Rohatgi, P. K.

doi:10.1007/bf00542734

Cited by 104 publications

(62 citation statements)

References 8 publications

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“…From 100 fibers randomly selected from the bundle, each corresponding equivalent diameter was directly measured in a model 6C Nikon profile projector. The equivalent diameter was obtained, following procedures indicated in several works 1,[24][25][26][27][28] , as an average between the larger and smaller (90° rotation) cross section dimensions at five locations along the fiber's length. By considering the fiber with irregular cross-section (distinct dimensions in 90° rotation), the average measurements were associated with the fiber equivalent diameter.…”

Section: Methodsmentioning

confidence: 99%

“…Investigation on changes in mechanical properties as a function of lignocellulosic fiber diameter has been reported since more than four decades [24][25][26][27][28][29][30] . Earlier international research groups investigated coir 24 , banana 25 , sisal 26 , pineapple 27 , palmyrah and talipot 28 fibers.…”

Section: Abstract: Fique Fiber Elastic Modulus Weibull Analysis Hymentioning

confidence: 99%

“…Earlier international research groups investigated coir 24 , banana 25 , sisal 26 , pineapple 27 , palmyrah and talipot 28 fibers. In these earlier works no correlation was proposed for the variation of mechanical properties with fiber diameter.…”

Section: Abstract: Fique Fiber Elastic Modulus Weibull Analysis Hymentioning

confidence: 99%

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Fique Fiber Tensile Elastic Modulus Dependence with Diameter Using the Weibull Statistical Analysis

et al. 2015

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Section: Methodsmentioning

confidence: 99%

Section: Abstract: Fique Fiber Elastic Modulus Weibull Analysis Hymentioning

confidence: 99%

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Fique Fiber Tensile Elastic Modulus Dependence with Diameter Using the Weibull Statistical Analysis

et al. 2015

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“…The fibrous mesocarp of the drupe has mainly been analysed in its dry state for its mechanical properties, as coir fibres are used in carpets, ropes [9], and cushions and seat covers in the automotive industry [10]. The Young's modulus of single dried fibre bundles lies in the range of 3-6GPa and the strains in the range of 15-47% when tested in tension [10,11]. The importance of the entire hydrated mesocarp as a potential material to withstand impact has so far not been addressed, although it is known that the coconut palm reaches up to 30m [7], which equals the potential energy of a 5kg fruit of almost 1.5kJ.…”

Section: Introductionmentioning

confidence: 99%

Fruit walls and nut shells as an inspiration for the design of bio-inspired impact resistant hierarchically structured materials

Seidel

Thielen

Schmitt

et al. 2010

WIT Transactions on Ecology and the Environment

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Until today the structuring of different types of fruit walls has only been used as an inspiration for packaging when seen from a biomimetic perspective. However, by detailed investigation of the Macadamia nut with its tough testa, Citrus maxima, which possesses a large spongy mesocarp and Cocos nucifera, which has a combination of a fibrous mesocarp and a tough endocarp, it becomes evident that those structures also provide excellent biological role models for impact and puncture resistant materials. Both Citrus maxima and Cocos nucifera are relatively heavy, lack any aerodynamic adaptation and share the same challenge of having to withstand impact from heights of more than 10 metres. By conducting high speed camera controlled free fall experiments of Citrus maxima from six metres high we could demonstrate a deceleration of the fruits of 3100m/s², which corresponds to 316g, without any visible damage to the fruit. An analysis using cyclic quasi static compression tests of the pericarp of Citrus maxima revealed that the material behaves constantly in good approximation after the first loading cycle. During the first cycle almost 75% of the energy is dissipated. The pericarp of Citrus maxima is highly visco-elastic, which causes the samples within one minute to recover 30% of their initial deformation caused by loading to 40% strain. The mesocarp of Citrus maxima is best described as an open pore foam with gradual increase in pore size. Understanding the principles of how combining structure and material in biological constructions yields a fully functional protection layer will allow us to construct new lightweight bio-inspired materials of high impact and puncture resistance with a combination of high energy dissipation, benign failure and almost complete recovery from large deformations.

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“…Additionally, inverse hyperbolic correlations were suggested to hold between the strength and the diameter of each type of fiber. The mentioned work [18] also indicated that correlations between lignocellulosic fibers dimensions and their mechanical properties have been early investigated [19][20][21][22][23][24][25]. For coir fiber [19], it was found that the strength and elongation seem to increase in the range of diameters from 100 to 200 µm and then remain constant up to 450 µm.…”

Section: Figurementioning

confidence: 99%

Selection of high strength natural fibers

Monteiro¹,

Satyanarayana

Ferreira³

et al. 2010

Matéria (Rio J.)

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By means of dimensional selection of natural lignocellulosic fibers, based on precise diameter measurements, it was recently possible to obtain fibers with relatively higher tensile strength. The present article overviews works on the statistical evaluation, through the Weibull analysis, of the ultimate tensile stress of eight lignocellulosic fibers: sisal, ramie, curaua, jute, bamboo, coir, piassava and buriti. It is shown that, for all of these fibers, the tensile strength holds an inverse relationship with the fiber diameter. Statistically this relationship conforms to a hyperbolic type of analytical equation, which discloses the possibility of unusually high strength fibers to be selected in association with very small diameters. A structural analysis using scanning electron microscopy offered an explanation to the strengthening mechanisms responsible for the superior performance of these dimensionally selected fibers.

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Mechanical behaviour of coir fibres under tensile load

Cited by 104 publications

References 8 publications

Fique Fiber Tensile Elastic Modulus Dependence with Diameter Using the Weibull Statistical Analysis

Fique Fiber Tensile Elastic Modulus Dependence with Diameter Using the Weibull Statistical Analysis

Fruit walls and nut shells as an inspiration for the design of bio-inspired impact resistant hierarchically structured materials

Selection of high strength natural fibers

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