scholarly journals Characterization of continuous Hibiscus sabdariffa fibre reinforced epoxy composites

2022 ◽  
Vol 30 ◽  
pp. 096739112110609
Author(s):  
Atik Mubarak Kazi ◽  
Ramasastry DVA
Keyword(s):  
Fibre Orientation ◽  
Stress Transfer ◽  
Dynamic Mechanical Properties ◽  
Epoxy Composites ◽  
Neat Epoxy ◽  
Hibiscus Sabdariffa ◽  
Sem Images ◽  
Fibre Composites ◽  
The Matrix

The influence of fibre orientation on physical, mechanical and dynamic mechanical properties of Hibiscus sabdariffa fibre composites has been studied. The composites with longitudinal (0°), transverse (90°) and inclined (45°) fibre orientation were prepared using the hand layup technique. ASTM standards were used for characterization of continuous Hibiscus sabdariffa fibre composites. The composite with longitudinally placed fibres yields improved mechanical characteristics. The addition of longitudinal (0°) oriented continuous Hibiscus sabdariffa fibres to the epoxy enhances tensile strength by 460%, flexural strength by 160% and impact strength by 603% compared to neat epoxy. The longitudinal (0°) fibre oriented composite offers higher resistance to water absorption and thickness swelling compared to other types of composites. All continuous Hibiscus sabdariffa fibre epoxy composites possess an improved storage modulus than the neat epoxy resin. The glass transition temperature of continuous Hibiscus sabdariffa fibre composites is 8%–31% lower than that of neat epoxy. Scanning electron microscopy (SEM) images confirm the existence of voids in the matrix, fibre pullout and crack propagation near the fibre bundle, which indicates the stress transfer between fibre and matrix is non-uniform.

scholarly journals Surface Modification of Areca Fibre by Benzoyl Peroxide and Mechanical Behaviour of Areca-Epoxy Composites

2021 ◽  
Vol 18 (1) ◽  
pp. 48-55
Author(s):  
Sakshi Shantharam Kamath ◽  
Basavaraju Bennehalli
Keyword(s):  
Surface Modification ◽  
Benzoyl Peroxide ◽  
Stress Transfer ◽  
Natural Fibre ◽  
Sem Analysis ◽  
Epoxy Composites ◽  
Fibre Composites ◽  
The Matrix ◽  
Reinforcing Material ◽  
Treatment Concentration

Natural fibre composites are playing great role in current life scenario where the focus is more on replacing synthetic fibre composites with natural fibre composites. In this current study, investigation was done on tensile and flexural behaviour of benzoyl peroxide treated areca sheath fibre epoxy composites. The surface modification of the fibre was confirmed by FTIR analysis. Treatment concentration was the major criteria which effects mechanical properties of the composites. At 4% concentration tensile strength and flexural strength was found to be maximum which was reported as 37.05 N/mm2 and 235.5 N/mm2 respectively which gradually decreased with increasing concentration of benzoyl peroxide. SEM analysis proved that at lesser concentration, the bonding between fibre and resin was effective which reduced as the concentration of benzoyl peroxide increased. This results in ineffective stress transfer between reinforcing material and the matrix which was the reason for failure of composites manufactured at higher treatment concentration.

Characterization of interfacial stress transfer ability in acetylation-treated wood fibre composites using X-ray microtomography

2017 ◽  
Vol 95 ◽  
pp. 43-49 ◽  
Author(s):  
Thomas Joffre ◽  
Kristoffer Segerholm ◽  
Cecilia Persson ◽  
Stig L. Bardage ◽  
Cris L. Luengo Hendriks ◽  
...  
Keyword(s):  
Treated Wood ◽  
Stress Transfer ◽  
Wood Fibre ◽  
Interfacial Stress ◽  
X Ray ◽  
Fibre Composites

scholarly journals Synthesis and Characterization of Natural Fibers Reinforced Fiber Epoxy Composites

2015 ◽  
Vol 51 ◽  
pp. 47-53
Author(s):  
U. Mahaboob Basha ◽  
D. Mohana Krishnudu ◽  
P. Hussain ◽  
K. Manohar Reddy ◽  
N. Karthikeyan ◽  
...  
Keyword(s):  
Room Temperature ◽  
Natural Fibers ◽  
Epoxy Composites ◽  
Synthesis And Characterization ◽  
Mechanical And Thermal Properties ◽  
Epoxy System ◽  
Pennisetum Typhoides ◽  
The Matrix ◽  
Reinforced Fiber

In the current work epoxy resin is chosen as matrix, treated Sacharum offinarum ( SugarCane) fiber, Pennisetum typhoides (Jowar)/ Fillet miller (Ragi) filler are chosen as reinforcement. Room temperature cured Epoxy System filled with Sacharum offinarum fiber and Pennisetum typhoides (Jowar)/ Fillet miller (Ragi) filler are synthesised by mechanical shear mixer, then kept in a Ultra sonic Sonicator for better dispersion of Pennisetum typhoides (Jowar)/ Fillet miller (Ragi) filler in the matrix. Different weights of modified Pennisetum typhoides (Jowar)/ Fillet miller (Ragi) filler (1,2,3,4,5 gm wt) has been incorporated into the Epoxy matrix in order to study the variation of Mechanical and Thermal properties.

Filament Fragmentation Phenomena

1989 ◽  
Vol 170 ◽  
Author(s):  
Juan C. Figueroa ◽  
Linda S. Schadler ◽  
Campbell Laird
Keyword(s):  
Strain Energy ◽  
Stress Transfer ◽  
Fiber Surface ◽  
Yield Information ◽  
The Matrix ◽  
Two Parameters ◽  
The Relationship

AbstractThe effect of fiber surface treatments on the relationship between the tensile strength of a filament and the shear strength of its interphase is one of the central issues facing composite materials technologists today. We demonstrate here that analysis of fragmentation phenomena in monofilament composites can simultaneously yield information about these two parameters. Characterization of shear stress transfer zones in non-critical fragments has led us to the determination of interphase strength.A phenomenological treatment that highlights the role of the matrix in the fragmentation process is presented here. This analysis considers issues such as the strain energy exchange between a failing fiber and the matrix, as well as interphase relaxation due to the viscoelastic nature of the matrix. Our observations of the fragmentation phenomena in AU4/polycarbonate monofilament composites indicate that the fiber/matrix interaction in this system is governed by micromechanical locking.

scholarly journals Fabrication and Characterization of Organoclay Reinforced Polyester Based Hybrid Nanocomposite Materials

2018 ◽  
Vol 8 (3) ◽  
pp. 3038-3040
Author(s):  
N. Zaman ◽  
S. Ahmed ◽  
M. Sanaullah ◽  
A. U. Rehman ◽  
A. R. Shar ◽  
...  
Keyword(s):  
Composite Materials ◽  
Nanocomposite Materials ◽  
Spectroscopic Techniques ◽  
Hybrid Nanocomposite ◽  
Characteristic Peak ◽  
Sem Images ◽  
The Matrix ◽  
Uv Visible ◽  
Fabrication And Characterization

Synthesis and characterization of polyester nanocomposites was conducted in order to fabricate hybrid composite materials of polyester/montmorillonite (MMT). Polyester based polymeric nanocomposite materials were synthesized by incorporating MMT nanoclay to produce polyester/MMT hybrid materials. Successful efforts were made to fabricate hybrid nanocomposite materials based on matrix (polyester based) and reinforcement (organoclay) through sonication at 6 and 12 hours. Synthesized nanocomposite polymers (polyester/MMT) showed different properties when compared to the properties of MMT and polyester, which confirmed the successful fabrication of the desired material. The finest incorporation of polyester with MMT was verified by UV-Visible spectrophotometer, Fourier tranform-infrared (FTIR) and scanning electron microscopy (SEM). The disappearance of the Si-O characteristic peak was observed in the FTIR spectrum justifying the fabrication of the desired composite materials. Colored SEM images were used to confirm the fine homogenous distribution of organoclay. Black SEM images showed the matrix and reinforcement together. SEM, FTIR and UV-Visible spectroscopic techniques were used to analyze polyester based nanocomposite materials and organoclay was found randomly distributed in the polymeric matrix whereas on the surface was observed to be mostly uniform.

Influence of Different Nano-Structured Fillers on the Performance of Epoxy Nanocomposites

2020 ◽  
Vol 29 ◽  
pp. 51-60
Author(s):  
Amr Osman ◽  
Abdelmoty Elhakeem ◽  
Saleh Kaytbay ◽  
Abdalla Ahmed
Keyword(s):  
Mechanical Properties ◽  
Electronic Devices ◽  
Functional Materials ◽  
Polymeric Materials ◽  
Epoxy Composites ◽  
Sem Images ◽  
Electrical Percolation ◽  
Reduced Graphene ◽  
The Matrix ◽  
Excellent Adhesion

Nowadays, multi-functional materials are strongly needed to meet the requirements of next-generation electronic devices. In this work, two different nanostructured fillers, reduced graphene oxide (RGO) and nanoalumina, were chosen to study their effect on the thermal, electrical and mechanical properties of the prepared epoxy composites at different loadings (0.5 to 2 wt%). RGO was firstly prepared and characterized by XRD, Raman spectroscopy and TEM confirming its production. The results revealed that RGO showed excellent adhesion with the polymer. Whilst, alumina aggregated and debonded from the matrix, as confirmed by SEM images. Hence, at only 2 wt%, RGO/epoxy composites exhibited the highest thermal conductivity (0.391 W/m-K), which was 1.96 times higher than the neat epoxy. Whereas, the alumina/epoxy composites showed lower increment at the same loading (0.206 W/m-K). However, at 2 wt% RGO, electrical percolation networks had been formed across the matrix (DC conductivity = 2×10-7 S/cm). While, epoxy filled with alumina remained insulative at any loading (~ 10-12 S/cm at 100 Hz). Besides, the tensile strength of the composites was improved by 75% and 37% when filled with 0.5 wt% RGO and alumina, respectively. These results are very useful for preparing multi-functional polymeric materials, which are critically required for packaging industries.

Mechanical Characterization of Polypropylene Natural Fibre Composites

2011 ◽  
Vol 383-390 ◽  
pp. 2737-2740 ◽  
Author(s):  
Sd Jacob Muthu ◽  
Ratnam Paskaramoorthy
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characterization ◽  
Fibre Surface ◽  
Alkaline Treatment ◽  
Natural Fibre ◽  
Fibre Composites ◽  
The Matrix ◽  
Pp Composites ◽  
Fibre Loading

Using polypropylene (PP) as matrix and kenaf mat as reinforcement, composite test samples were fabricated by compression molding. Thereafter, the effect of fibre loading and the alkaline fibre surface treatment on the mechanical properties were studied. The kenaf/PP composites were found to have better mechanical properties than the polymer matrix. As expected, the interfacial bonding between the matrix and the fibres improved considerably when the fibres were subjected to alkaline treatment.

Fabrication and Dynamic Mechanical Properties Offly Ash/Epoxy Composites

2007 ◽  
Vol 353-358 ◽  
pp. 1467-1470 ◽  
Author(s):  
Gao Hui Wu ◽  
Jian Gu ◽  
Qiang Zhang ◽  
Xiao Zhao
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Dynamic Mechanical Properties ◽  
Epoxy Composites ◽  
Dynamic Mechanical ◽  
Waste Production ◽  
The Matrix ◽  
Dynamic Elastic Moduli ◽  
Test Specification ◽  
Modified Epoxy

An inexpensive fly ash (FA), which is from a waste production, has been employed to fabricate fly ash/epoxy composites in our work. Three kinds of fly ash with the most probable diameters of 74"m, 119"m and 146"m were filled in the modified epoxy resin (EP). The purpose of this study is to characterize the dynamic mechanical properties of such composites, and the dynamic mechanical behaviors of the composites are investigated in the temperature range from -40 to 150oC using a tension-compression mode. The results indicate that the dynamic elastic moduli for the fly ash/epoxy composites are (1.4~2.0) GPa, and the peak values of loss factor (tanδ) for these composites can reach (0.79~0.90) in the test specification. In addition, a scanning electron microscope (SEM) has been used to observe the distribution of fly ash particles in the matrix, as well as the photographs of fracture surface of composites.

scholarly journals Dielectric spectroscopy and structural characterization of nano-filler-loaded epoxy resin

2021 ◽  
pp. 2150011
Author(s):  
S. G. Thakor ◽  
V. A. Rana ◽  
H. P. Vankar ◽  
T. R. Pandit
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Epoxy Composite ◽  
Structural Information ◽  
Epoxy Composites ◽  
Neat Epoxy ◽  
Frequency Range ◽  
Additional Information ◽  
Lcr Meter

This work outlines the characterization of epoxy resin [Bisphenol A-(epichlorhydrin): epoxy] and hardener [[Formula: see text](3-dimethylaminopropyl)-1,3-propylenediamine] with various inorganic nano-fillers. Dielectric characterizations of epoxy, hardener, neat epoxy (epoxy + hardener) and nano-epoxy (nano-filler + neat epoxy) composites loaded with 1 wt.% of inorganic nano-fillers (SiO2, Al2O3, TiO2 and ZnO) were carried out using precision LCR meter, over the frequency range of 1 kHz–2 MHz at a constant temperature of 300.15 K. The structural information of nano-fillers, neat epoxy and nano-epoxy composites was understood by Fourier transform infrared spectroscopy and by XRD. Moreover, hardness and shear strength (shear punch) were also determined in order to gain additional information about the mechanical properties of epoxy composite. Influence of inorganic nano-fillers on the dielectric properties, structural chemistry and mechanical properties of neat epoxy composite is discussed thoroughly in this study.

scholarly journals Interfacial Pathways in Wood

2000 ◽  
Vol 9 (1) ◽  
pp. 096369350000900 ◽  
Author(s):  
Caroline Baillie ◽  
Delphine Tual ◽  
Jean Christophe Terraillon
Keyword(s):  
Environmental Conditions ◽  
Materials Science ◽  
Interfacial Crack ◽  
Stress Transfer ◽  
High Strength ◽  
Interfacial Stress ◽  
Fibre Composites ◽  
The Matrix ◽  
Energy Absorbing ◽  
Crack Paths

Wood structure and properties have been established for many years. The interaction of structure with properties has also been studied, but rarely from a materials science perspective. This paper attempts to focus on a particular aspect of composite structure, that of the interface. In engineered fibre composites the interface is the most important feature as it is the medium by which the stress is transferred from the matrix to the fibres so that they may bear the load. Much research has been focused on solving the optimisation of the interfacial stress transfer, as it is always suggested that the interface needs to be weak for high toughness and strong for high strength of the composite. More recent studies have identified the fact that it may be more advantageous to create an interface, which is not destructive in its energy absorbing capacity. Another area of weakness at the interface is the resistance to water ingress in certain environmental conditions. Biomimetics is an emerging approach to solving scientific issues by looking to nature to see what solutions are offered for the particular concerns of engineers and their products. In this case wood is the subject of study. It is assumed that wood has optimised its internal interfaces to cope with strength and toughness requirements as well as harsh environmental conditions. The internal interfaces thus need to be firstly examined and identified. This paper looks in a qualitative way at the three different interfacial crack paths which may be likened to those occurring in engineered composites: interfacial, interlaminar and intercellular (bundle/bundle interaction) and their proposed relation to energy absorption mechanisms, It also explores the influence of moisture on these fracture paths.

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