Influence of Woven and Cross-Ply Laminates on Mechanical Properties of Coir Epoxy Composite

Abstract

This research work was concerned with the evaluation of mechanical properties; flexural strength and impact strength of coconut coir textile composites. The coir fabric reinforcement was in a form of woven and cross ply structure. The two types of laminates orientations for cross-ply structures were 0/90 degrees and 45/-45 degrees. Composites with fibre weight fraction of 30% were prepared by hand lay-up and vacuum bagging technique. Mechanisms of composites failure were examined using scanning electron microscopy (SEM). Results have shown that the woven coir reinforced composites exhibited higher impact resistance and flexural strength (warp woven) compare to cross-ply composites. Moreover, 0/90 degrees orientations demonstrated better strength performance compare to 45/-45 degrees. However, damage propagation on woven composites was found to be larger than cross-ply composites. Normality test of data distribution were evaluated using Minitab software and it was proven that all samples were in a very stable behaviour (p > 0.05). Experimental results were also validated using one way analysis of variance technique (one way-ANOVA) and it revealed there was statistically significant difference (p < 0.05) between all different fabric structures of coir fabric as reinforcement in composite.

Karakteristik Kekuatan Impak Dan Kekerasan Hybrid Biokomposit Berbasis Epoksi Yang Diperkuat Serat Sabut Kelapa Dan Serat Sintetis

“…Hal ini tidak terlepas dari karakteristik karet yang memiliki kinerja menyerap energi impak yang lebih baik dibandingkan kain sintetis. Temuan ini lebih baik dari penelitian sebelumnya yang melaporkan kekuatan impak hybrid biocomposite berpenguat sabut kelapa dengan matriks epoksi, masing-masing sebesar 0.0073-0.014 J/mm 2 [21] dan 0.01 J/mm 2 [22] .…”

Noncontact inspection of impact damage properties of woven fabric-reinforced composites after low-velocity impact by using air-coupled ultrasonic technique

“…The slope of the ascending section of each curve is termed the impact bending stiffness. It represents the stiffness of composites under impact and bending induced at the beginning of the impact process [18]. Typical load-displacement curves of the laminate composite structure subjected to impact loading have shown three kinds of situations, including rebounding in 5 J case due to impact energy was not high enough to infiltrate full penetration and frictional force between the impactor and the composite plate [19], penetration in 15 J and perforation in 25 J.…”

Impact behaviour of woven coir-epoxy composite: Effects of woven density and woven fabric treatment

“…Our preliminary research using the vacuum bagging method also proved that impact strength of woven coir composite greatly outperforms cross-ply and angle-ply composites. 4 Generally, weave density has a decisive influence on the utilisation of fabric for some technical applications. Weave density refers to the number of yarns per unit dimension along the principal yarn directions and it affects the yarn crimp and fabric areal density.…”