Elastic And Dynamic Response Characteristics Of
Kenaf/polypropylene Composites
Author(s)
N. V. David, S. Khairiyah & P. P. Anwar Majeed
Abstract
The elastic and dynamic characteristics of natural fibre based materials are of
particular concern for packaging applications. In this study, the tensile and
flexural behaviour of kenaf filled polypropylene (kenaf/PP) composites are
experimentally studied. The mass fraction of kenaf is varied from 0wt% to
60wt% in 10% increments. Two rates of extensions, namely, 2mm/min and
10mm/min are used for the tensile test. The flexural test is conducted at a rate of
1mm/min with reference to the ASTM D790-10 standard. The results obtained
indicate that the elastic modulus of the kenaf/PP composites increases while the
Ultimate Tensile Stress (UTS) of the composites decreases with increasing fibre
loadings. It is found that the elastic modulus of the 60wt% composite increases
from 1.89GPa to 2.64GPa when the extension rate is increased from 2mm/min to
10mm/min. For this same increment of extension rate, it is observed that the
UTS of the composites reduces when the fibre loadings are increased with the
10mm/min rate registering higher UTS values than that by the 2mm/min rate.
The stiffness of the composites in tension thus increases at the expense of their
strength when the extension rate is increased. A semi-empirical model employed
in this study also predicts similar responses. The stiffness of the composites in
bending mode is found to be little affected by the fibre content in the neat PP.
The fracture toughness of the kenaf/PP composites decreases by 56% as the fibre
fraction is increased from 10wt% to 60wt%. The first three modes of vibration of
the composites are simulated using ANSYS® ver. 12.1 program. The natural
frequencies corresponding to the elastic response of the composites at the two
extension rates for these modes fluctuate between 208Hz and 725Hz.
Keywords: kenaf, agro-waste, bio-composites, tensile properties, dynamic
characteristics, empirical models.
Keywords
kenaf, agro-waste, bio-composites, tensile properties, dynamic
characteristics, empirical models.
Related Book
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