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In this paper, an attempt has been made to investigate the effect of coir fiber addition along with the banana fiber in low-density polyethylene (LDPE) to develop cost-effective and high-performance composite material. The composite samples were prepared at fixed fiber content (25 wt%) and with varying relative weight fraction of banana and coir fiber using compression molding technique. The effect of hybridization was analyzed through the mechanical properties (tensile, flexural, and impact), thermal stability, morphological behavior, and water absorption behavior. Additionally, scanning electron microscopy studies had been carried out on the tensile fractured surface for all composite samples to examine the fracture behavior of the composite samples. The results showed that the incorporation of coir fiber into the banana fiber composites of up to 50% by weight led to enhancement of the mechanical properties and thermal stability and to reduction of the water absorption capacity of the banana fiber/LDPE composites.

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Drilling in composite materials causes versatile damages, such as: delamination, fibre-pull out, edge chipping, uncut fibers and others. Delamination is said to be an empirical problem associated with drilling fiber reinforced composite materials. Thrust force has been cited as an imperative cause of delamination. The present work vertically tailors to establish a correlation between cutting parameters namely thrust force and delamination. Drilling experimental trials were carried out on basalt/sisal polymer composites material using HSS twist drill. The data obtained through drilling are processed by "Minitab 17" software package. The analysis of achieving the optimality condition are performed through 3286 M. Sakthivel et al. ANOVA, regression model and response diagram (RD) to evaluate the best mathematical input models for making drilling in fabricated composite. The analysis reveals the optimized parameter to control thrust force and delamination factor in basalt/sisal fibre is Drill bit diameter at 3mm, speed at 300 rpm and feed rate at 0.1mm/rev.

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