Browsing by Author "Karnik, S.R."

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    Assessment of circularity error in drilling of cenosphere reinforced epoxy composites
    (American Institute of Physics Inc. subs@aip.org, 2019) Angadi, S.B.; Gaitonde, V.N.; Doddamani, M.; Karnik, S.R.
    In automobiles, aircrafts and under water vehicles structural applications syntactic foams are widely used due to their superior specific mechanical properties and offered light weightiness. Fly ash cenosphere embedded epoxy resin forms one such syntactic foam addressing environmental concerns. In the present work mathematical models based on full factorial design are proposed using response surface methodology to study the effect of speed, drill dia., feed and % of cenosphere content on error in circularity of the drilled hole by tungsten carbide twist drill. Experimental studies reveal that error in circularity is mainly governed by drilling speed and drill diameter. Further higher cenosphere loading plays a crucial role in minimizing error in circularity. © 2019 Author(s).
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    Experimental investigations on hole quality in drilling of cenosphere reinforced epoxy composite
    (2019) Angadi, S.B.; Ashrith, H.S.; Gaitonde, V.N.; Karnik, S.R.; Doddamani, M.
    Cenosphere reinforced epoxy composites are steadily replacing the conventional materials in marine, aerospace and automobile structuresowing to their lightweight properties.Drilling is an important conventional machining process essential for assemblyof polymer composites using rivets and bolts. Drilling induces damage around the hole which significantly deteriorates composite performance. In the present study, hole quality characteristicssuch as cylindricity and delamination in drilling of fly ash cenosphere filled epoxy composites are investigated using coated tungsten carbide drill bits.Feed, cutting speed, filler content and drill diameter are considered as the drilling process variables.Samples are fabricated by varying cenosphere content from 10to 60by volume %inepoxy resin.Full factorial design (FFD) based experiments are conducted on CNC vertical machining center. Response surface methodology (RSM) based mathematical models are proposed to estimate the characteristics of the hole quality in developed composites. Analysis of variance is used to validate the developed mathematical models.Present study reveals that the cylindricity and delamination decreases with increasing feed. Increasing cutting speed decreases the cylindricity, however delamination is found to be increasing.Results also shows the importance of using high cenosphere content for producing sound quality holes, which is also beneficial from weight savingperspective. � 2019 IOP Publishing Ltd. All rights reserved.
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    Experimental investigations on hole quality in drilling of cenosphere reinforced epoxy composite
    (Institute of Physics Publishing helen.craven@iop.org, 2019) Angadi, S.B.; Ashrith, H.S.; Gaitonde, V.N.; Karnik, S.R.; Doddamani, M.
    Cenosphere reinforced epoxy composites are steadily replacing the conventional materials in marine, aerospace and automobile structuresowing to their lightweight properties.Drilling is an important conventional machining process essential for assemblyof polymer composites using rivets and bolts. Drilling induces damage around the hole which significantly deteriorates composite performance. In the present study, hole quality characteristicssuch as cylindricity and delamination in drilling of fly ash cenosphere filled epoxy composites are investigated using coated tungsten carbide drill bits.Feed, cutting speed, filler content and drill diameter are considered as the drilling process variables.Samples are fabricated by varying cenosphere content from 10to 60by volume %inepoxy resin.Full factorial design (FFD) based experiments are conducted on CNC vertical machining center. Response surface methodology (RSM) based mathematical models are proposed to estimate the characteristics of the hole quality in developed composites. Analysis of variance is used to validate the developed mathematical models.Present study reveals that the cylindricity and delamination decreases with increasing feed. Increasing cutting speed decreases the cylindricity, however delamination is found to be increasing.Results also shows the importance of using high cenosphere content for producing sound quality holes, which is also beneficial from weight savingperspective. © 2019 IOP Publishing Ltd. All rights reserved.