COMPOSITES FROM NATURAL FIBRES
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It is an incontrovertible fact that currently a number of natural fibres such as jute, flax bamboo coir and okra are being considered as suitable candidates for fibre reinforcement material in composites following chemical modification. Some of the fibres show hydrophobic behaviour following chemical treatments which makes them ideal for use in composites. Although a great deal of works has been done on the application of natural fibres by many research workers, only a few aspects of work have been reported and there are many questions to be answered. This paper addresses some of the issues connected with composites which are produced from natural fibres. In order to have information on the structure properties and their interrelationships, a considerable amount of work has been reported but some more work is desirable. Also, data on their properties following chemical modification are required.
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1,2,3,4 Undergraduate Students, Vishwakarma Institute of Technology, Pune, India 5Assistant Professor, Department of Mechanical Engineering, Vishwakarma Institute of Technology, Pune, India ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract – In the present scenario of fast growing world, the problem of depleting resources is a major concern for mankind. Also the extraction techniques of some materials lead to environmental pollution and thus the need for alternative material development has taken a major leap in the recent years. This has led to the development of composite materials and especially natural fiber composite materials. The natural fibers provide added advantage over their synthetic counterparts in terms of durability as well as sustainability. The present paper focuses on the development of banana fiber and jute fiber composites, their analysis and also a brief comparison...
IJRET: International Journal of Research in Engineering and Technology
eISSN: 2319-1163 | pISSN: 2321-7308
COMPOSITES FROM NATURAL FIBRES
A.O. Abdul Salam Sait1, Venkatraman Subramaniam2
1
Associate Professor, National Institute of Fashion Technology, Chennai-113
2
Professor, Jaya Engineering College, Chennai-602024
Abstract
It is an incontrovertible fact that currently a number of natural fibres such as jute, flax bamboo coir and okra are being considered as
suitable candidates for fibre reinforcement material in composites following chemical modification. Some of the fibres show
hydrophobic behaviour following chemical treatments which makes them ideal for use in composites. Although a great deal of works
has been done on the application of natural fibres by many research workers, only a few aspects of work have been reported and there
are many questions to be answered. This paper addresses some of the issues connected with composites which are produced from
natural fibres. In order to have information on the structure properties and their interrelationships, a considerable amount of work
has been reported but some more work is desirable. Also, data on their properties following chemical modification are required.
Keywords: Natural Fibres, bamboo fibres, flax fibres
----------------------------------------------------------------------***-------------------------------------------------------------------1. INTRODUCTION
It is an incontrovertible fact that currently a number of natural
fibres such as jute, flax bamboo coir and okra are being
considered as suitable candidates for fibre reinforcement
material in composites following chemical modification. Some
of the fibres show hydrophobic behaviour following chemical
treatments which makes them ideal for use in composites.
Although a great deal of works has been done on the
application of natural fibres by many research workers, only a
few aspects of work have been reported and there are many
questions to be answered. This paper addresses some of the
issues connected with composites which are produced from
natural fibres. In order to have information on the structure
properties and their interrelationships, a considerable amount
of work has been reported but some more work is desirable.
Also, data on their properties following chemical modification
are required.
2. RESEARCH WORK DONE
Zafeiro Poulous, Dijon and Baillie (2007) have reported
extensive work on the effect of treatments on the tensile
strength of flax fibres. Flax fibres were subjected to
acetylation and stearation. They were treated for different
periods and tested at gauge lengths of 5, 8 and 10 mm. SEM
analysis of fractured surfaces was also done and detailed
statistical analysis was performed by assuming the distribution
to be normal or gaussian. Thus their study focused on the
effect of surface treatments upon the tensile strength of flax
fibres. It was found that the treatments did not significantly
change the flax fibre tensile strength. SEM examination of the
fractured surfaces revealed that acetylated fibres exhibit a
different mode of failure from the other fibres. They have not
done characterization of treatment fibres by XRD and FTIR.
What is most significant in their research is the analysis of the
data by Weibull modeling. Two different methods (the linear
regression and the maximum likelihood) were employed in
order to estimate the Weibull modulus (m) and the Weibull
characteristic strength (o). The two methods yielded similar
values for the Weibull modulus (m) and the Weibull
characteristic strength (o). It was found that the surface
treatments did not significantly change the tensile strength of
flax fibres. They have also critically analysed the computation
of m and o by using four estimators. However, the
Kolmogorav and Smirnov test has not been performed to test
the validity of Weibull distribution. Bergman (1984) studied
the statistical properties of the four estimator through a Monte
Carlo simulation and showed that majority of the estimators
gave conservative estimations of the Weibull modulus i.e.,
lower values than the real value. However, Trustrum and
Jayatilaka (1979) have reported that for sample sizes less than
40, maximum likelihood best results of m and o were
obtained and for sample sizes which are above 40, the estimate
with the smallest standard error is obtained by the least
squares estimate.
On jute fibres, Roy et al (2012), Saha et al (2010), Defoirdt et
al (2010), Xia et al (2002) and Sinha et al (2008) have dealt
with the modification of jute fibres. Zhang, Pan and Wang
(1992) found very good improvement in the accuracy of
predicted values by considering the diameter variation using
Weibull distribution. The same methodology was followed by
two research workers, namely Xia et al (2009) for jute and Sia
et al (2014) for treated oil palm fibres. This exponent was
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IJRET: International Journal of Research in Engineering and Technology
eISSN: 2319-1163 | pISSN: 2321-7308
suggested by Watson and Smith (1985) and Gutans and
Tamuzh (1984) to narrow the differences between
experimental and predicted values of Weibull modulus. This
modified Weibull modulus was found to be more accurate for
prediction of mechanical properties. Although Roy et al
(2012) provide tensile strength data on jute fibres following
treatment by low concentration of alkali, the values of
untreated jute fibres are not given. Igar Maria De Rosa et al
(2010) have given the tensile properties of New Zealand flax
(phormium tenax) technical fibres which are to be used as
potential reinforcement in polymer matrix composites. They
have carried out single fibre tensile tests at three gauge lengths
to assess the effect of gauge length on tensile strength and
Young’s modulus. Weibull distribution was used for analyzing
the results. The morphology, diameter and fracture modes of
P. tenax fibres were also characterized through optical and
scanning electron microscopy.
area correction factor was noticed. Basalt fibres were also
studied in detail by Militky and Kovacic (2011), Dirikolu et al
(2002) have conducted a statistical analysis of composite
materials using Weibull distribution. The reliability of the
materials was also1 studied.
Shao et al (2013) and Das et al (2006) have dealt with the
bamboo fibres, the former dealing with scaling analysis of the
tensile strength of bamboo fibres using Weibull statistics and
the latter with the influence of alkali treatment on the fine
structure and morphology of bamboo fibres. Shao et al (2013)
have demonstrated that the two parameter Weibull model can
be used for predicting the strength distribution of fibres of
longer gauge lengths.
[2]
Das et al (2006) have studied the influence of alkali treatment
on the fine structure and morphology of bamboo fibres.
Structural parameters such as crystallinity, orientation angle,
degree of crystallinity, and crystallinity index were studied.
Andersons et al (2008) have studied the strength distribution
of elementary flax fibres due to mechanical defects. Virk
(2010) has characterized the physical properties using digital
images. It was found that the true fibre area followed a lognormal distribution. Tensile tests were carried out at ten
different gauge lengths between 6 mm and 300 mm and the
Young’s modulus strain to failure and ultimate tensile
strengths were determined individually. A strong correlation
was found between the fibre strength/fracture strain and fibre
gauge length. As expected, it was found that as the gauge
length increased, the fibre strength/fracture strain dropped.
The fibre failure (strength/strain) was modeled using Weibull
distribution and three statistical models were developed to
relate the fibre strength/fracture strain to the fibre gauge
length. An examination of the data revealed that the
coefficient of variation (CoV) for failure strain was
consistently lower than that of the CoV for fracture stress
(strength) as the failure strain was influenced by the fibre,
cross section. Hence failure strain is the more consistent
failure criterion and it was recommended to use failure strain
as the key design criterion for natural fibre composites in
order to improve reliability in the design of these materials.
Also, the elastic modulus using fibre angle and length
distribution was modeled using rule of mixtures. Improved
prediction in tensile modulus due to the incorporation of fibre
3. CONCLUSIONS
Thus a considerable amount of work has been done on natural
fibres for use in composites. Further work is required on the
blends of natural fibres silk and their characterization
following chemical modification. This is a fertile area of
research, and a considerable amount of work is warranted.
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IJRET: International Journal of Research in Engineering and Technology
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