Browsing by Author "Garje Channabasappa, M.K."

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Dynamic characterization of hybrid composite material of rotor-bearing support system
(Taylor and Francis Ltd., 2022) Gonsalves, T.H.; Garje Channabasappa, M.K.; Motagondanahalli Rangarasaiah, R.; Joladarashi, S.
In this paper, the dynamic characterization of hybrid composite material of carbon-epoxy sandwiched by steel is presented from the rotor-bearing system perspective. The tensile and flexural strengths of the hybrid material are investigated followed by the detailed damping estimation using modal testing in cantilever mode and dynamic mechanical analysis in double cantilever mode. The experimental characterization results obtained in this work have fundamentally ascertained the mechanical and dynamic behavior of hybrid composite material for the intended application. © 2020 Taylor & Francis Group, LLC.
Hybrid composite shaft of High-Speed Rotor-Bearing System - A rotor dynamics preview
(Bellwether Publishing, Ltd., 2021) Gonsalves, T.H.; Garje Channabasappa, M.K.; Motagondanahalli Rangarasaiah, R.
In this present study, the detailed rotor dynamic evaluation of hybrid composite material rotating shaft of a power turbine high-speed rotor-bearing system is presented. The slender power turbine shaft of front driving turboshaft engine powering the rotorcraft requires a stiffer and lighter material to exhibit better rotor dynamics. Based on the preliminary investigation which predicted substantial rotor dynamic advantages, the laminated composite material shaft is proposed in the compressor section of the rotor-bearing system. To avoid the direct exposure of composite material to the harsh environment of gas turbine engine, hybrid metal fiber form of rotating shaft is employed. The hybrid metal fiber shaft is comprised of a core laminated carbon-epoxy tube sandwiched by steel tubes both inside and outside. The effect of parametric variation in the laminate and length of the hybrid shaft is evaluated and compared with the existing steel shaft. The viscoelastic material damping of carbon-epoxy laminate is also included as a rotating internal damping to evaluate the rotor dynamic instability threshold of the rotor-bearing system. From the analysis, it is found that the combination of metal and fiber-reinforced material can effectively leverage the combined strengths of both materials. © 2020 Taylor & Francis Group, LLC.
Influence of textile properties and textile pattern on sisal reinforced Poly Vinyl Ester (Flex GR 200-60) composite
(Taylor and Francis Ltd., 2023) Nagamadhu, M.; Kivade, S.B.; Basavaraju, S.; Garje Channabasappa, M.K.; Subramanya, R.; Malyadri, T.
This paper focuses on the effect of yarn diameter, the density of yarn, woven type, Gram per Square Metre (GSM) and weight fraction fibre on tensile, flexural and impact properties of weaved sisal composite. Various types of woven fabrics were prepared from sisal fibres, and these fabrics are used to prepare the composites of variable weight fraction (Wff) as 20, 40, 50 and 60 percent by maintaining proper alignment of warp and weft direction. The tensile, flexural, and impact properties were found to increase with Wff content in all types of woven pattern composites. Plain 1 (P1) shows better mechanical properties as compared to Plain 2 (P2) and Plain 3 (P3)-based composites, and this shows GSM has a higher significance on mechanical properties. Further, the influence of woven pattern was analysed and found that the plain woven exhibits better tensile strength, but the herringbone exhibits better flexural and impact strength. Scanning Electron Microscope evidenced that good interfacial bonding between fibre and matrix interface. © 2022 Informa UK Limited, trading as Taylor & Francis Group.