Effect of single-fiber properties and fiber volume fraction on the mechanical properties of Ioncell fiber composites (original) (raw)
Related papers
Journal of Applied Polymer Science, 2020
Fiber‐reinforced composites based on natural fibers are promising alternatives for materials made of metal or synthetic polymers. However, the inherent inhomogeneity of natural fibers limits the quality of the respective composites. Man‐made cellulose fibers (MMCFs) prepared from cellulose solutions via wet or dry‐jet wet spinning processes can overcome these limitations. Herein, MMCFs are used to prepare single fiber epoxy composites and UD composites with 20, 30, 40, and 60 wt% fiber loads. The mechanical properties increase gradually with fiber loading. Young's modulus is improved three times while tensile strength doubles at a loading of 60 wt%. Raman spectroscopy is employed to follow conformational changes of the cellulose chains within the fibers upon mechanical deformation of the composites. The shift of the characteristic Raman band under strain indicates the deformation mechanisms in the fiber. Provided stress transfer occurs through the interface, it is a direct measu...
THEORETICAL ANALYSIS OF NATURAL FIBER VOLUME FRACTION OF REINFORCED COMPOSITES
In the latest years industry is attempting to decrease the dependence on petroleum based fuels and products due to the increased environmental consciousness. This is leading to the need to investigate environmentally friendly, sustainable materials to replace existing ones, and to solve the problems of recycling of agriculture waste. We are trying to understand composites due to their high potential as a material with suitable strength, low weight and low deformation. Fiber and epoxy as lamina are used to form composite laminates with desired directional properties. Mechanical properties for composites are derived starting from properties of fiber and matrix, using the rule of mixtures, and the fiber volume fraction plays a significant role in the determination of the mechanical properties. In this work the value of the fiber volume fraction is determined taken into consideration the fibrous structure constituent, random fiber, yarns or fabric.
Effect of Unit Cell on Elastic Properties of Fiber Reinforced Polymer Composite Materials
The mechanics of fiber reinforced composites are complex due to their anisotropic and heterogeneous characteristics. The present work is to evaluate the material properties of fiber reinforced composites for different volume fractions up to 60%. A numerical homogenization technique based on the finite element analysis (FEA) with unit cell was used to evaluate the material properties of unidirectional Kevlar fiber reinforced Epoxy composite. A three-dimensional single and multiple unit cell micromechanical models have been developed by using ANSYS software. The material properties obtained using the numerical homogenization techniques were compared with different analytical methods like rule of mixture, Halpin-Tsai, and periodic microstructure methods. The effect of volume fraction of fiber on predicted material properties of composite is also studied.
A Numerical Method To Evaluate The Elastoplastic Material Properties Of Fiber Reinforced Composite
2018
The representative volume element (RVE) plays a central role in the mechanics of random heterogeneous materials with a view to predicting their effective properties. In this paper, a computational homogenization methodology, developed to determine effective linear elastic properties of composite materials, is extended to predict the effective nonlinear elastoplastic response of long fiber reinforced composite. Finite element simulations of volumes of different sizes and fiber volume fractures are performed for calculation of the overall response RVE. The dependencies of the overall stress-strain curves on the number of fibers inside the RVE are studied in the 2D cases. Volume averaged stress-strain responses are generated from RVEs and compared with the finite element calculations available in the literature at moderate and high fiber volume fractions. For these materials, the existence of an RVE is demonstrated for the sizes of RVE corresponding to 10–100 times the diameter of the ...
Computational Materials Science, 2007
The aim of presenting this paper is to evaluate the effective material properties of randomly distributed short fibre (RDSF) and transversely randomly distributed short fibre (TRDSF) composites with change in volume fraction, and aspect ratio of fibres. A numerical homogenization technique based on the finite element method (FEM) is used to evaluate the effective material properties with periodic boundary conditions. A modified random sequential adsorption algorithm (RSA) is applied to generate the three-dimensional unite cell models of randomly distributed short cylindrical fibre composites. The developed numerical homogenization technique is used to calculate effective material properties in order to systematically evaluate different material systems. The numerical results are also compared and verified with different analytical methods.
Journal of Mechanics of Materials and Structures, 2007
In this paper effective material properties of randomly distributed short fiber composites are calculated with a developed comprehensive tool for numerical homogenization. We focus on the influence of change in volume fraction and length/diameter aspect ratio of fibers. Two types of fiber alignments are considered: fiber orientations with arbitrary angles and parallel oriented fibers. The algorithm is based on a numerical homogenization technique using a unit cell model in connection with the finite element method. To generate the three-dimensional unit cell models with randomly distributed short cylindrical fibers, a modified random sequential adsorption algorithm is used, which we describe in detail. For verification of the algorithm and checking the influence of different parameters, unit cells with various fiber embeddings are created. Numerical results are also compared with those from analytical methods.
Effect of fibre volume on tensile properties of real unidirectional fibre-reinforced composites
Composites, 1991
A simple theoretical model is proposed to account for the effect of high fibre loading on the tensile properties of real, unidirectionally reinforced fibre composites. Based on the reduction of interfacial surfaces due to fibre-fibre interaction, a modification to the rule of mixtures is proposed. The experimentally observed non-linear variation of tensile strength with fibre volume can be predicted by the modified rule. Experimental data from the literature are used to validate and verify the model and show good agreement with the predictions.