Investigation of Thrust Force and Torque Induced Failure on Stacking Sequence of Glass Fibers in GFRP Composite Laminates during Drilling Process

of drilling forces produced during the drilling process of [0/0/0] or uni-directional and [0/90/0] or bi-directional glass fiber reinforced epoxy composite laminates. The composite laminates were prepared by hand lay-up technique. The drilling process is carried out by using 3 drill bits of different drill point geometries viz. 4-facet, 8-facet and jo-drill. The corresponding ultimate failure stress for the manufactured composite laminates has been determined by using Tsai-wu failure criteria. The study reveals that, the finest orientation for glass fibers i.e. bi-directional can be implemented for manufacturing of the glass fiber reinforced epoxy GFRP composite laminates due to minimum damage affecting failure. Finally, the scanning electron microscopic observation on the drilled specimens are examined and discussed accordingly.