Browsing by Author "Dutt, J.K."

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Development and Characterization of Epoxy-Based Polymeric Composite with Bio-particulates as Filler Material
(Springer Science and Business Media Deutschland GmbH, 2022) Chandraker, S.; Dutt, J.K.; Agrawal, A.; Roy, H.; Rajkumar; Chandrakar, K.; Mishra, V.
The focus of this paper is to develop cheap and unconventional materials for both structural and non-structural applications using eco-friendly bio-wastes. The study used pistachio nutshells (normally disposed of as waste) for fabricating bio-particulate-based polymeric composites. In this investigation, epoxy is taken as matrix material and pistachio nutshells in the form of microparticles are used as filler material. Six different sets of composites with varying filler content up to a maximum of 30 wt% are fabricated by a hand lay-up method. The excellent compatibility and bonding between the matrix and filler material under investigation are confirmed by micrograph obtained from scanning electron microscopy and by Fourier-transform infrared spectroscopy analysis. Physical and mechanical properties are evaluated experimentally as per ASTM. Apart from that, a linear viscoelastic semi-solid model is reported here to understand the mechanical dynamic behaviour of the developed material. On the basis of several test result, the developed composite may find its potential application in light-duty structures efficiently. © 2021, King Fahd University of Petroleum & Minerals.
Dynamic characteristics of a flexible coupling
(2019) Aggarwal, M.; Dutt, J.K.; Chandraker, S.
Flexible couplings are used to transmit power between two shafts and accommodate, more realistically, a combination of parallel, axial and angular misalignments, between them. Presence of misalignment of certain degree is considered unavoidable. The coupling also attenuates the transmission of fluctuation of torque and speed from one rotor to the other by flexing itself, and is thus helpful in providing nearly smooth transmission of speed and torque. However, in this process, the dynamic behavior of the rotors is also influenced by the coupling characteristics, as the coupling incorporates a flexible damped intermediate member between the shafts it couples. A detailed literature survey has shown that researchers so far have not attempted to find out the dynamic characteristics, the stiffness and damping of a coupling, and, instead, the effect of misalignment (combination of parallel and angular misalignment) is considered to generate forces independent of the coupling characteristics. This paper attempts to find out an analytical model for the dynamic characteristic of segmented link coupling in terms of suitable non-dimensional coefficients to generate the characteristics of a coupling element which may be used for dynamic analysis of coupled rotor shaft system. Copyright � 2019 ASME.
Dynamic characteristics of a flexible coupling
(American Society of Mechanical Engineers (ASME) infocentral@asme.org, 2019) Aggarwal, M.; Dutt, J.K.; Chandraker, S.
Flexible couplings are used to transmit power between two shafts and accommodate, more realistically, a combination of parallel, axial and angular misalignments, between them. Presence of misalignment of certain degree is considered unavoidable. The coupling also attenuates the transmission of fluctuation of torque and speed from one rotor to the other by flexing itself, and is thus helpful in providing nearly smooth transmission of speed and torque. However, in this process, the dynamic behavior of the rotors is also influenced by the coupling characteristics, as the coupling incorporates a flexible damped intermediate member between the shafts it couples. A detailed literature survey has shown that researchers so far have not attempted to find out the dynamic characteristics, the stiffness and damping of a coupling, and, instead, the effect of misalignment (combination of parallel and angular misalignment) is considered to generate forces independent of the coupling characteristics. This paper attempts to find out an analytical model for the dynamic characteristic of segmented link coupling in terms of suitable non-dimensional coefficients to generate the characteristics of a coupling element which may be used for dynamic analysis of coupled rotor shaft system. Â© Â© 2019 ASME.