Abstract
Machining of polymer matrix composites is a complex phenomenon owing to anisotropic behavior of these materials. Optimization of drilling process parameters were aimed in this work with determination of delamination factor. Polymer matrix composites were fabricated by mixing of matrix and reinforcement under varying ratios of weight and different layers of reinforcement for characterization. Plies were arranged as 8 jute, 6 jute and 2 silk, 4 jute and 4 silk, 2 jute and 6 silk and 8 silk plies respectively. Composite fabrication was followed by drilling of composites with different bit sizes and spindle speeds taking varying bit sizes of 3.20, 4.20, 4.75, 5.56 mm and the spindle speeds of 720, 960, 1200, 1440 rpm respectively. Finally, optimization in Minitab using the TAGUCHI were analyzed and optimized data for minimum delamination determined for different polymer combinations. The hybridized laminates with both jute and silk combinations are observed to have reduced delamination factor here as compared to all jute or all silk ply laminates which can be an important criterion in damage minimization on account of delamination due to drilling. This study presents analysis which can help in improved machining of polymer matrix composites with minimum of wastage and enhance scope of application of these materials in modern technological advancements involving assemblies and thereby requiring drilled holes.
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