Comparative Analysis of Hole Surface Quality in CNC Drilling of Novel Sisal Fibre Reinforced Aluminium Wire Mesh Sandwich Composite and Sisal Fiber Laminate With 90°/0°/90° Ply Orientation Angle

Abstract

Aim: Comparison of surface roughness during novel drilling the natural fibre metal composite laminate of novel sisal fibre and aluminum mesh layered in the form of sandwich (sisal - aluminium - sisal - aluminium - sisal) with sisal reinforced composite laminate. The unidirectional sisal fibre is laid in 90°/0°/90° orientation in both the laminates considered for comparison.
Materials and Methods: The work material chosen for this study is aluminium wire mesh of grade 6092 and unidirectional sisal fibre. The type of drill bit selected for novel drilling operation is tungsten carbide drill bit. The Sisal fibre reinforced laminates were manufactured in two groups (Experiment group =1 and Control Group =1). Sample sizes for each group were 20 with pre-test power of 80%, beta=0.05%, and CL 95%.
Result: An experimental study is selected with 20 samples per group and surface roughness is measured for both the work samples and analyzed for its significance by spss software and the graphs were plotted and level of significance was found to be p = 0.023 (p<0.005).
Conclusion: Within the limitations of the study, the experimental group of novel sisal fibre reinforced with aluminium wire mesh sandwich composite (sisal - Al - sisal - Al -sisal) with 90⁰ /0⁰ /90⁰ ply orientation angle gives the good surface finish with 8.06% improvement in reducing surface roughness value in comparison with base materials.