Investigations on drilling process parameters of Hybrid Composites with different stacking sequence

Abstract

Precision in mechanical fastening plays a vital role in assembly of engineering structures. Reliability of the fastening process depends on the hole geometry. With the advent of technology in material science, hybrid composites have occupied a major part in engineering structures due to their high stiffness to weight ratio. This paper discusses the influence of stacking sequence in hybrid composites on Tensile strength, displacement and flexural strength. FE analysis and experimental results of displacement values obtained from tensile strength are compared for different stacking sequences. The flexural strength for different stacking sequences are calculated theoretically and experimentally validated by three point bending test. Drilling is a material removal process commonly used in hole making operations in metals, alloys and composites. The drilling process parameters are optimized for CGGC stacked composites, the stacking sequence showed high strength in the earlier tests. Experiments were conducted based on Taguchi method based Design Of Experiments (DOE) and the results obtained shows a strong relation between the drill diameter, spindle speed and feed on roundness, cylindricity and surface finish that directly control the hole quality. Better quality in hole geometry is achieved by setting the optimum conditions obtained through the analysis.