Abstract
The fiber extracted from pineapple leaf (PALF) displays relevant mechanical properties that are motivating investigations for possible engineering application as polymer composite reinforcement. As any natural lignocellulosic fiber, the PALF presents non-uniform dimensions and heterogeneous properties with a significant dispersion of values. In fact, a marked variation in the tensile strength has been reported, which represents a problem for the design of a PALF reinforced composite. In several other lignocellulosic fibers, the diameter dimension was found to affect the value of the tensile strength. This work investigated the precise diameter dependence of the PALF tensile strength using the Weibull statistic method. The results showed a mathematical hyperbolic type of inverse correlation between the PALF strength and its diameter, which was found to be similar to that commonly obtained in other lignocellulosic fibers.
Highlights
Since the past century, composites became the fast growing class of materials for engineering applications
Since no investigation has been conducted so far on the diameter influence, the objective of the present work was to determine with statistical precision the Pineapple Leaf Fibers (PALF) correlation between its ultimate tensile strength and equivalent diameter by means of Weibull analysis
Based on the maximum load (L) obtained from curves such as those illustrated in Figure 5, the tensile strength was determined for each fiber by the following equation: σm = 4L/πd[2] (4)
Summary
Composites became the fast growing class of materials for engineering applications. They can be projected through the combination of distinct phases, to attend specific requirements not possible to be achieved by a single conventional ceramic, polymer or metallic alloy[1]. Synthetic fiber-based products cannot be recycled and, may be responsible for long-term pollution after their discard at the end of operational life. Both CO2 emission and worldwide pollution are becoming serious environmental problems affecting global warming and climate changes[5]. Glass fiber processing and handling, as leftover, are hazardous procedures that may cause lung diseases
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