Diameter dependence of tensile strength by Weibull analysis: Part III sisal fiber

Abstract

Environmental aspects and economical advantages are motivating the use of natural fiber as reinforcement of polymer composites in substitution for synthetic fiber composites such as fiber glass. In particular, the sisal fiber is one of the most investigated and being used in engineering systems. By contrast to synthetic fibers, natural fibers have the disadvantage of being heterogeneous in their dimensions specially the diameter. In several natural fibers it has been found that the smaller the diameter, the stronger is the fiber. In this work a Weibull analysis of sisal fibers tensile strength was performed to find a correlation with the diameter. The results revealed an inverse dependence of the tensile strength with the diameter. The observation of ruptured fibers by scanning electron microscopy suggested possible mechanisms that justify a hyperbolic correlation.

Natural Lignocellulosic Fibers as Engineering Materials—An Overview

“…The already mentioned recent works [10][11][12][13][14][15][16][17][18][19] on the tensile strength variation with the LCF equivalent diameter showed a consistent inverse correlation similar to what was earlier reported on pineapple. [4,8] Consequently, very thin diameter LCFs could eventually be selected with relatively high strength.…”

“…[10][11][12][13][14][15][16][17][18][19] The statistical distribution of diameters was based on 100 randomly picked fibers from the lots. For each type of fiber overviewed in the PW, histograms corresponding to the frequency of diameter distribution were obtained [10][11][12][13][14][15][16][17][18][19] and reproduced in Figure 3. Diameters and cross-sectional areas along the fiber length were evaluated by means of profile projector measurements.…”

“…[8] For palmirah fibers, the strength and the elongation decreased with the test length. [9] Recent works [10][11][12][13][14][15][16][17][18][19] have shown that not only pineapple but also many LCF species display an inverse correlation between the fiber diameter and its tensile strength. This appears to be a common feature to all fibers owing to the role played by microstructural defects and an intrinsic statistical distribution of microfibril strength.…”

Mechanical characteristics of groundnut shell particle reinforced polylactide nano fibre

“…The small diameter of fibre at 5 wt. % untreated GSP-PLA nanofibre can also be said to contribute to its high UTS and energy at break as observed in Figures 1 and 5 [15,16]. The composite with 3 wt.…”

Development of Manila Hemp Fiber Epoxy Composite With High Tensile Properties Through Handpicking Fiber Fragments

“…These parameters are greatly influenced by the climate condition, growth age, source and the digestion process, which in turn influence the properties of fiber and it's composite 5,6 . It has been reported that fiber strength increases with increasing cellulose content and decreasing spiral angle in micro level 5 , and shows inverse dependence on diameter of fiber form macro view 7,8 . However, how growing point influences the properties of fiber has not been reported.…”