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Open AccessArticle

Estimation of the Effects of the Cross-Head Speed and Temperature on the Mechanical Strength of Kenaf Bast Fibers Using Weibull and Monte-Carlo Statistics

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Laboratory of Simulation and Testing, The University Institute of Technology, The University of Ngaoundéré, Ngaoundéré P.O. Box 455, Cameroon
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Laboratory of Mechanics, Materials and Photonics, Faculty of Sciences, The University of Ngaoundéré, Ngaoundéré P.O. Box 455, Cameroon
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Institut Pascal, UMR CNRS/UBP/SIGMA 6602, Campus des Cézeaux, BP 10448, F-63000 Clermont-Ferrand, France
*
Author to whom correspondence should be addressed.
Fibers 2019, 7(10), 89; https://doi.org/10.3390/fib7100089
Received: 22 August 2019 / Revised: 23 September 2019 / Accepted: 27 September 2019 / Published: 11 October 2019
(This article belongs to the Special Issue Plant Fibers)
Methods used by different researchers to evaluate plant fibers’ (PFs) mechanical performance, show great variance in results. In this work, 320 single kenaf fibers of gage lengths 10 and 20 mm were tensile-tested using four speed levels (0.05; 0.5; 1 and 5 mm·min−1). Sixty-three other specimens were also tested under three temperature levels (50, 100, and 150 °C). Mechanical characteristics, namely Young’s modulus, tensile strength, and failure strain were determined. Estimation of the dispersion on the data was performed using Weibull and Monte-Carlo statistics. Results showed a low scatter for cross-head speeds of 0.05, 0.5, and 1 mm·min−1, compared to 5 mm·min−1 for the two gage lengths used. Monte-Carlo average failure strength values were found to be close to the experimental values. A drastic drop in the tensile strength was observed for the temperature of 150 °C for varying hold times. The reported findings are likely to be used in the elaboration of a tensile test standard on PFs. View Full-Text
Keywords: plant fiber; mechanical properties; Weibull methods; Monte-Carlo simulation; mechanical testing; heat treatment plant fiber; mechanical properties; Weibull methods; Monte-Carlo simulation; mechanical testing; heat treatment
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Ntenga, R.; SAÏDJO, S.; Beda, T.; Béakou, A. Estimation of the Effects of the Cross-Head Speed and Temperature on the Mechanical Strength of Kenaf Bast Fibers Using Weibull and Monte-Carlo Statistics. Fibers 2019, 7, 89.

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