Sarmila Sahoo

Prof. Dr. Sarmila Sahoo

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Research Focus & Metrics

Academic Career Length

23Years (2004-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 October 2005 in Journal of Vibration and Control
Verified
Journal Article
Closed access
SSSarmila Sahoo
Sarmila Sahoo
DCD. Chakravorty
D. Chakravorty
A review of the literature reveals that information regarding fundamental frequencies and mode shapes of shallow laminated composite hypar shells with practical civil engineering boundary conditions is not available. The present investigation aims to fill this gap by applying an eight-noded isoparametric shell element as the tool. Numerical experiments are carried out for different parametric variations including boundary conditions and stacking orders to obtain the fundamental frequencies and mode shapes. Some of the results are used for validating the correctness of the present approach by comparing with the existing benchmark, while the other results are studied meticulously to extract a set of meaningful conclusions regarding the free vibration characteristics of composite shallow hypar shells.

9 August 2019 in Engineering Research Express
Verified
Journal Article
Closed access
AMArkadeb Mukhopadhyay
Arkadeb Mukhopadhyay
SSSarmila Sahoo
Sarmila Sahoo
Pitting corrosion and susceptibility to chloride attacks are the shortfalls of reinforcement steel used in concrete structures. The present work proposes the deposition of electroless nickel coatings to provide barrier protection due to their proven corrosion resistance. The effect of deposition of Ni–P, Ni–P–W and Ni–P–Cu coatings on the corrosion behavior of Fe—600 grade rebars in 3.5% NaCl has been investigated with the aid of potentiodynamic polarization and electrochemical impedance spectroscopy. The corrosion potential of bare rebar was observed to be −653 mV while that of electroless Ni–P, Ni–P–W and Ni–P–Cu coatings was −436, −391 and −356 mV respectively. The corrosion current density of the rebars also decreased significantly by the application of electroless nickel coatings. Nyquist plots also revealed a bigger semicircular loop for the coated rebars. The chloride attack was severe on the bare uncoated rebar and scanning electron micrograph revealed severe cracking. On the other hand, the vulnerability of the electroless coated rebars to pitting corrosion decreased greatly.

1 July 2004 in The Journal of Strain Analysis for Engineering Design
Verified
Journal Article
Closed access
SSSarmila Sahoo
Sarmila Sahoo
DCD Chakravorty
D Chakravorty
A general finite element procedure with an eight-noded isoparametric curved quadratic element is presented to investigate the static behaviour of laminated composite hyperbolic paraboloidal shells bounded by straight edges (commonly called hypar shells). Numerical results are obtained for uniformly loaded laminated composite hypar shells with six practical boundary conditions, where the edges are differently restrained. Eight different types of lamination including single layered and multi-layered, cross-ply and angle-ply, symmetric and antisymmetric stacking orders are chosen. The numerical results of different shell actions of 48 combinations are furnished to estimate their relative performances. The authors further propose typical comparative performance matrix to study the relative efficiencies of different stacking combinations, which will be a great help in design.

17 April 2006 in Journal of Sound and Vibration
Verified
Journal Article
Closed access
SSSarmila Sahoo
Sarmila Sahoo
DCDipankar Chakravorty
Dipankar Chakravorty

1 January 2019 in Curved and Layered Structures
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Journal Article
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HLHareram Lohar
Hareram Lohar
AMAnirban Mitra
Anirban Mitra
SSSarmila Sahoo
Sarmila Sahoo
Forced vibration of non-uniform axially functionally graded (AFG) Timoshenko beam on elastic foundation is performed under harmonic excitation. A linear elastic foundation is considered with three different classical boundary conditions. AFG materials are an advanced class of materials that have potential for application in various engineering fields. In the present work, variation of material properties along the longitudinal axis of the beam are considered according to power-law forms. Five values of material gradation parameter provides different functional variation and their effect on the frequency response of the system is studied. The present approximate method is displacement based and Von-Karman type of geometric nonlinearity is considered with rotational component to incorporate transverse shear. Hamilton’s principle is used to derive nonlinear set of governing equation and Broyden method is implemented to solve the nonlinear equations numerically. The results are successfully validated with previously published article. Frequency vs. amplitude curve corresponding to different combinations of system parameters are presented and are capable of serving as benchmark results. A separate free vibration analysis is undertaken to include backbone curves with the frequency response curves in the non-dimensional plane.

1 December 2014 in Engineering Science and Technology, an International Journal
Verified
Journal Article
Open access
SSSarmila Sahoo
Sarmila Sahoo
In this paper, finite element method has been applied to analyze free vibration problems of laminated composite stiffened shallow spherical shell panels with cutouts employing the eight-noded curved quadratic isoparametric element for shell with a three noded beam element for stiffener formulation. Specific numerical problems of earlier investigators are solved and compared to validate the present formulation. Moreover, free vibration problem of stiffened shallow spherical shell panels with different size and position of the cutouts with respect to the shell centre for different edge constraints are examined to arrive at some conclusions useful to the designers. The results are presented in the form of figures and tables. The results are further analyzed to suggest guidelines to select optimum size and position of the cutout with respect to shell centre considering different practical constraints