To improve strength to weight ratios, the fiber reinforced polymer compositematerials are often used in conjunction with another material, like metals, to formhybrid structure. This paper reports the quality of holes produced inTitanium/Graphite Hybrid Composites (TiGr), which are made of thermoplasticpolymer matrix composite (PMC) plies with titanium foils as the outer plies. TiGrcomposites are a potentially enabling technology, which satisfies the low structuralweight fraction and long operational lifetime required for the High Speed CivilTransport. Unfortunately, PMC and Ti alloys have dissimilar machining properties;therefore, present challenging drilling difficulties. In this study, the experimental workhas been performed to characterize the machined hole quality parameters encounteredin drilling of TiGr composites. Polycrystalline diamond (PCD) drills were used for theexperiments. The hole quality parameters including hole dimensional errors, titaniumburrs, delamination, and hole defects were investigated and discussed.
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