Dynamic mechanical analysis of randomly oriented short bagasse/coir hybrid fibre-reinforced epoxy novolac composites |
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Authors: | Sudhir Kumar Saw Gautam Sarkhel Arup Choudhury |
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Institution: | (1) Department of Civil Engineering, Department of Chemical Engineering, Kongu Engineering College, Perundurai, Erode, 638 052, India;(2) Anna University – Trichy, Ariyalur Campus, Tiruchirapalli, 621 713, India;(3) Central Institute of Coir Technology, Coir Board, Bangalore, 560 058, India |
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Abstract: | Hybrid composites of epoxy novolac reinforced with short bagasse fibres and short coir fibres were prepared. The mechanical
and dynamic mechanical properties of these bagasse-coir hybrid fibres reinforced epoxy novolac composites were investigated
with reference to different layering patterns of the composites. The tensile properties of the tri-layer composites are recorded
higher than those of the bi-layer composites, whereas the flexural properties of the tri-layer composites are lower than bi-layer
composites. The tensile strength of the intimate mix composite is comparable with trilayer composite having bagasse as skin
material. The effect of layering pattern on storage modulus (E′), damping behavior (tan δ), and loss modulus (E″) was studied as a function of temperature and frequency. The E′ values of the bi-layer composites are recorded lower than those of tri-layer (bagasse/coir/bagasse) and intimately mixed
hybrid composites. The minimum E′ value is obtained for the composites made with coir as skin layer. Bi-layer composite shows maximum damping property. The
theoretical modeling showed good correlation with experimental results at above glass transition temperature (T
g
), while theoretical model deviates experimental data at lower T
g
. The Arrhenius relationship has been used to calculate the activation energy of the glass transition of the composites. |
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Keywords: | |
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