Browsing by Author "Pandi, R.R."

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    DESIGN OF THIN CURVED SENSOR TO MEASURE CONTACT SLIP IN FRETTING EXPERIMENTS
    (Department of Naval Architecture and Marine Engineering, 2022) Pandi, R.R.; Kaliveeran, V.
    This paper proposes a new thin curved sensor/strip to measure the relative slip between pad and specimen under fretting conditions. Since the relative contact displacement is a vital parameter to categorize the fretting process, the measurement of contact displacement between pad and specimen is necessary. The spring steel has chosen to fabricate the thin curved strip because of its high yield strength and the ability to return to its initial position even with notable deflection. Before the fabrication, Finite Element Analysis (FEA) was performed on the thin curved sensor. The strip consists of different shapes (rectangular, circular, and elliptical) of slots, and the number of slots in each strip is varied from 2 to 6. The Strain Energy Approach (SEA) has been used to calculate the displacement for the curved strip, and it was compared, verified, and validated with its FEA and Experimental results. Four configurations were chosen from FEA study of thin curved strips with slots to measure micro-level displacement between pad and specimen under fretting experiments. The present study reveals that the increasing number and size of holes in the curved strip increases displacement and von-Mises stress values, which ensure higher flexibility to the strip. The reduction in the area and minimum thickness of the curved strip could be the reason for the decrease in the stiffness of the curved strip. This study explores using a new novel and straightforward instrument/sensor to capture the micro-level relative displacement between the pad and specimen under fretting conditions. © 2022 ANAME Publication. All rights reserved.
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    Wave trapping efficiency of a flexible membrane near a partially reflecting seawall
    (American Society of Mechanical Engineers (ASME), 2021) Venkateswarlu, V.; Vijay, K.G.; Pandi, R.R.; Nishad, C.S.
    The gravity wave interaction with a flexible membrane placed at a finite distance from the partially reflecting seawall is analyzed under the framework of linear water wave theory using the multi-domain boundary element method (BEM). The flow through a flexible membrane is assumed to follow Darcy's law in addition to membrane displacements. As a viable alternative to the existing wave dampers, the flexible membrane is examined for the effective dampening of incident waves. The correctness of the numerical results is affirmed with the known results available in the literature. The effect of membrane tension, submergence depth, membrane width, porosity, angle of inclination, and confined chamber spacing on hydrodynamic coefficients is discussed as a function of dimensionless wavenumber. The partially reflecting harbor wall diminishes the wave reflection coefficient in the long-wave regime. The increase in the flexible membrane width does not necessarily ensure the ideal wave capturing performance. A shift in the peak of the maximum deflection is observed with the increase of membrane width while there is a shift in peak outward for the increase in the submergence depth. Moreover, the maximum deflection is found to decrease with the increase in porosity, and it is 62% reduction for membrane porosity b = 1 due to the significant wave damping. The wave run-up and the wall force coefficients are found to be minimum when the relative plate width is B/h = 1. The present study is expected to be useful for the design of cost-effective wave attenuating systems. © © 2021 by ASME.