Characterization and modeling of pultruded jute fibre reinforced unsaturated polyester composite
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Date
2011
Authors
Safiee, Sahnizam
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Abstract
Pultruded Jute Fibre Reinforced Unsaturated Polyester Composites (PJFRC) was
prepared and examined stage by stage in this study. Three different fibre volume percent
ofPJFRC with 50, 60 and 70% were prepared using the pultrusion technique. The PJFRC
with 70% of fibre volume percent was successfully produced and displayed a
homogeneous fibre distribution before having a high attrition to the fibre surface if the
fibre volume percent more than 70%. Analysis was done by means of mechanical
analysis, dynamic mechanical analysis, thermal conductivity and thermal mechanical
analysis. In every analysis, the unidirectional composite material was determined in the
longitudinal and transverse fibre direction. Improvement in properties suggests effective
stress transfer between fibre and matrix. Morphological assessment, was done through
micrograph observation in every mechanical testing evaluation. At 60% and 70% of jute
fibre loading, tensile strength improved by 0.06% and 0.03% respectively, while the
modulus of elasticity improved at 60 and 70% with 0.01% and 0.08% respectively.
Increasing of fibre volume percent is said to improve the mechanical and physical
properties of the P JFRC specimens. All of these parameters were then used for further
analysis using finite element analysis. The finite element analysis program was used in
order to estimate the coefficient of the thermal expansion at two different directions
(longitudinal and transverse). Considering symmetry of the composite using the square
array in representative unit cell, it was modeled for the Finite Element (FE) analysis
using ANSYS software. The coefficient of thermal expansion of the considered polymer
matrix composites were significantly affected by the parameters characterizing the
interphase. The analytical analysis to predict the CTE values for the longitudinal and
transverse direction was taken from the previous study. All of these models were used for
predicting the CTE value for the unidirectional composite materials. Some of the models
are Van Fo Fy model, Schapery model, Chamberlain model, Schneider model, and
Chamis model. Results of various finite element solutions for different types of
composites were compared with the results of various analytical methods and with the
available experimental results. All of the models and finite element analysis are in good
agreement with the experimental data for longitudinal CTEs, however Chamis and Finite
Element results for transverse CTE were generally showed better agreement with the
experimental data than the other methods for all the different fibre volume percent
investigated.