Study of the viscoelastic behaviour of the Raffia vinifera fibres

Tagne, Nicodème Rodrigue Sikame; Ndapeu, Dieunedort; Nkemaja, D.; Tchemou, Gilbert; Huisken, W.; Njeugna, Ebénézer; Fogue, Médard; Dréan, Jean-Yves; Harzallah, Omar

doi:10.1016/j.indcrop.2018.07.077

Cited by 14 publications

(3 citation statements)

References 32 publications

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“…During the various tests considering every isotherm. The usual models (figure 5) [64] are listed in table 1. These expressions will be used to test the numerical data obtained during creep acquisition.…”

Section: Creep Parametersmentioning

confidence: 99%

Influence of temperature on the creep behaviour by macroindentation of Cocos nucifera shells and Canarium schweinfurthii cores (bio-shellnut wastes in Cameroon)

Koungang

Ndapeu

Tchuindjang

et al. 2020

Mater. Res. Express

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The aim of this study was to show how temperature modifies the mechanical characteristics of the Cocos nucifera (CN) shells and the Canarium schweinfurthii (CS) cores. The test consisted in performing an instrumented macroindentation on prismatic specimens in an adiabatic chamber; the indentation carried out according to four temperature ranges (30 °C, 50 °C, 70 °C, 90 °C). The Oliver and Pharr method is used for the analysis of mechanical parameters in indentation: reduced Young’s modulus, hardness, creep coefficient. These parameters have enabled to estimate indirect characteristics such as toughness and ultimate mechanical stress to be obtained. The creep data are simulated to have the rheological model to these materials by considering the statistical criteria. As a global observation, when the temperature increases, the mechanical parameters decrease; although CN is more sensitive to the temperature gradient than CS, these 2 materials show performances that allow them to be classified as engineering polymer materials according to the Ashby diagram.

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Section: Creep Parametersmentioning

confidence: 99%

Influence of temperature on the creep behaviour by macroindentation of Cocos nucifera shells and Canarium schweinfurthii cores (bio-shellnut wastes in Cameroon)

Koungang

Ndapeu

Tchuindjang

et al. 2020

Mater. Res. Express

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“…Ref. [ 13 ], have studied the viscoelastic behavior of Raffia vinifera fibers to enhance bio-composites. The eight-element Burger model provides the best match to the data using the uniaxial tensile creep-recovery test apparatus.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Mechanical Behavior of Acacia—Raffia Natural Fiber Composite

Vijaya Ramnath,

Palanikumar

2023

Polymers

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Nowadays, industries place a strong emphasis on low-cost, biodegradable materials with long lifespans. As a result, businesses are concentrating on creating composite materials utilizing the world’s plentiful supply of natural fibers. In this study, acacia and raffia fibers are combined with epoxy resin and a hand layup method to create a biodegradable composite laminate. This article investigates the effect of fiber orientation on the mechanical and morphological evaluation of composite materials that have been manufactured. Three different kinds of composites were fabricated in this work: Composite 1, which contained acacia fiber; Composite 2, which was built of acacia and raffia fiber; and Composite 3, which was made of raffia fiber. While Composite 2 is a hybrid composite in this instance, Composites 1 and 3 are monofiber composites. In accordance with the ASTM standards, testing was performed to investigate the different mechanical behaviors, including tensile, flexural, double shear, delamination, hardness, and impact. The results demonstrate that Composite 1 has strong tensile strength, flexural strength, double shear, and hardness tests with a 45° fiber orientation. The 90° fiber orientation of Composite 1 performs well in the inter delamination test. The result demonstrates that composite 1 of type 0 absorbs greater energy. Additionally, Scanning electron microscopy was used to conduct morphological examinations in order to investigate the internal structural failure of the composites. It was found that the composite laminate has fiber cracks, pullouts, and voids, which were reduced with the right curing times and stress.

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“…e water diffusion phenomenon was studied through a fiber [10,11] and through cork [12] of raffia vinifera. e mechanical [13] and viscoelastic [14] properties of raffia fibers from the stem show that these fibers can be well used in the field of composite materials; in addition, they have an added advantage due to their high elongation [15] compared to flax and sisal fibers already used in the automotive industry. e realization of such a composite uses polymeric matrices in the form of paste whose water can be absorbed by the fiber during the process of shaping the composite.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Hygro-Mechanical Behaviour through Raffia vinifera Fiber during the Water Diffusion Phenomenon

Takoudjou

Tagne

Tuwa

et al. 2021

Mathematical Problems in Engineering

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In an industrial context where the use of friendly materials is encouraged, natural fibers of vegetable origin become more solicited for the reinforcement of composite materials. This work deals with the modeling of the hygro-mechanical behavior through raffia vinifera fiber during the diffusion phenomenon. The modeling of water diffusion through the raffia vinifera fiber is described by Fick’s second law and taking into account the swelling phenomenon of the fiber. The equation obtained is solved numerically by the finite difference method, and the evolution of the fiber radius as a function of time is obtained. By applying the Leibniz integration rule, a mathematical expression to predict the evolution of this radius as a function of time is proposed. It is observed numerically and analytically an increase of the dimensionless fiber radius with time up to a critical value after what one observes the saturation. This model allowed us to propose a mathematical model describing the absorption kinetics of the raffia vinifera fiber through its absorption ratio. By comparing the results of this model with the experimental results from the literature, one observes a good agreement. Moreover, the induced stresses in the fiber during the water diffusion can also be estimated with the proposed mathematical model expression of fiber. These stresses increase with time and can reach between 5 and 7 GPa. The results of this work can be used to predict the behavior of the raffia vinifera fiber inside a composite material during its development.

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Study of the viscoelastic behaviour of the Raffia vinifera fibres

Cited by 14 publications

References 32 publications

Influence of temperature on the creep behaviour by macroindentation of Cocos nucifera shells and Canarium schweinfurthii cores (bio-shellnut wastes in Cameroon)

Influence of temperature on the creep behaviour by macroindentation of Cocos nucifera shells and Canarium schweinfurthii cores (bio-shellnut wastes in Cameroon)

Investigation of the Mechanical Behavior of Acacia—Raffia Natural Fiber Composite

Modeling of Hygro-Mechanical Behaviour through Raffia vinifera Fiber during the Water Diffusion Phenomenon

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