Faculty Publications
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Item Dry sliding friction and wear of Al 6061 and Al 6082 alloys under different normal loads(Elsevier Ltd, 2019) Srinivasula Reddy, I.; Kaliveeran, V.The current research work addresses evolution of coefficient of friction over sliding distance. Friction and wear tests were conducted using pin on disk type tribometer. The stabilized friction coefficient values under normal load of 10 N and 15 N for Al 6061 were noted as 0.5 and 0.58 respectively. Corresponding friction coefficient values for Al 6082 were noted as 0.6 and 0.45 respectively. Equation to calculate wear volume was derived for cylinder on flat contact. The dominant wear mechanisms were justified with the images of the disk specimens captured using optical microscope. Increase in wear volume resulting from increase in normal load was observed for Al 6061 and Al 6082 alloys. © 2019 Elsevier Ltd. All rights reserved.Item Flexural modulus of epoxy composite reinforced with Arecanut husk fibre (AHF): A mechanics approach(Elsevier Ltd, 2019) Muralidhar, N.; Kaliveeran, V.; Arumugam, V.; Srinivasula Reddy, I.Arecanut Husk Fibre (AHF) is an agricultural waste material. Polymer composites prepared with AHF as reinforcing material avoids dumping of arecanut husk onto bare land. AHF contributes to the development of innovative products having low environmental impact. These polymer composites are cost-effective and have low-density. Composites manufactured using polymers and natural fibre are widely used in aerospace, automobile, construction and marine structural applications. AHF was extracted by chemical retting process using 6% sodium hydroxide solution. The present research focuses on composite panel preparation using epoxy reinforced with treated AHF (15% by weight of composite) and flexural characterization of the composite. Composites were made with three-layered arrangement of AHF threads. In the current study, flexural modulus of AHF composite panels is determined by conducting dynamic flexural tests with fixed-fixed support condition and at different loading frequencies. The flexural modulus of the composite material is calculated using Euler-Bernoulli bending theory and results are compared with existing literature. © 2019 Elsevier Ltd. All rights reserved.Item Sliding of various ductile materials (Al 6061, Al 6082) using pin on disc setup(Elsevier Ltd, 2019) Srinivasula Reddy, I.; Kaliveeran, V.The present study focuses on understanding the variation of coefficient of friction over a period of time. At various sliding cycles, the coefficient of friction was noted from the well-controlled sliding experiments. Friction tests were conducted using Aluminium alloys (Al 6061 and Al 6082) with 10 N constant normal load and at sliding speed of 1.5 m/s. The detailed friction results have been presented and discussed to understand the influence of coefficient of friction on the contact tractions at the interface. The obtained friction results are compared with the results mentioned in literature, where reciprocating sliding experiments were conducted. From this comparison, it is concluded that the formation of oxide and nitride layers are dominant, when the friction tests are conducted using pin on disc setup. © 2019 Elsevier Ltd. All rights reserved.Item Forecasting Future Traffic Trend by Short-Term Continuous Observation(IOP Publishing Ltd, 2020) Mendi, V.; Srinivasula Reddy, I.Annual Average Daily Traffic (AADT) is a key parameter to understand the traffic flow rates, traffic density and to design any highway. Generally, short period observed traffic data mainly depends on that season in which the traffic surveys were conducted, which may be high or low compared to the other seasons. So, the behavior of seasonal variation of traffic must be considered for the AADT analysis. These seasonal variations can be found out using the past recorded data of that selected location. But in the case of a location where the past annual traffic data is not available, an alternative method is required to calculate the seasonal variation of the traffic data. The present study deals with the analysis of seasonal variation factors to estimate the AADT from the fuel sale data collected from the nearby petrol stations at the traffic survey point. This work explains how Annual Average Daily Traffic (AADT) can be estimated from a week's limited traffic data when there is a scarcity of automatic traffic data collecting systems. © Published under licence by IOP Publishing Ltd.Item Future Traffic Prediction from Short Period Traffic Data(IOP Publishing Ltd, 2020) Srinivasula Reddy, I.; Mendi, V.Prediction of future traffic is a complicated process which requires logical prediction methods and experience. The present study focused on the prediction of future traffic from the AADT data which is estimated from the one week continuous traffic data collected from the selected study area. State wise traffic contributions are estimated from the one-day number plate survey data and major states effecting the traffic in the study area are observed. The population data, vehicle registration data and economic data of the major states which are observed through number plate survey are used for the prediction of future traffic data. The vehicle growth rates were calculated using average vehicle registration growth rate method and nonlinear regression (power regression). Finally, the growth rates were decided according to the traffic design norms provided by NHAI. The year wise future traffic was predicted and presented in this paper from the year 2013 to 2040. The changes in Level of Service (LOS) of the NH 8A for four lane and six lane configuration is detailed for the future scenario. © Published under licence by IOP Publishing Ltd.Item A Study on Areca nut Husk Fibre Extraction, Composite Panel Preparation and Mechanical Characteristics of the Composites(Springer, 2019) Muralidhar, N.; Kaliveeran, V.; Arumugam, V.; Srinivasula Reddy, I.Areca nut husk fibre is an agricultural waste, which does not contribute to the economy of areca nut plantation. The use of areca nut husk fibre as reinforcing material in the preparation of low-cost and lightweight composites provides utility value to areca nut husk fibre. Low-cost and lightweight composites have wide range of applications in construction industry, marine structures, automobile industry and aerospace industry. The present work focuses on extraction of areca nut husk fibre with alkali treatment process by using 6% of sodium hydroxide solution, composite panel preparation and determination of mechanical properties of composite panels. Different fibre compositions (fine fibre, coarse fibre and coarse fibre sandwiched with glass fibre) of 15% by weight were used in the present study. Tensile, flexural and impact tests were conducted to find the mechanical characteristics the composite materials. The tensile strength of composites made with fine fibre (15.1 MPa) is observed to be more than that of composites made with coarse fibre (10.8 MPa). Further improvement in tensile strength of composite panels made of coarse areca nut husk fibre layer sandwiched with two layers of glass fibre (24.8 MPa) is observed. The flexural strength of fine fibre composites is more when compared to that of the coarse fibre composites. The average flexural strength of composites reinforced with fine fibre, coarse fibre and coarse fibre sandwiched with glass fibre is observed as 73 MPa, 66.7 MPa and 284 MPa, respectively. The impact strength of coarse fibre composites is found to be higher when compared to that of fine fibre composites. © 2019, The Institution of Engineers (India).Item Dynamic mechanical characterization of epoxy composite reinforced with areca nut husk fiber(Polish Academy of Sciences 12 Smetna Street Krakow 31-343, 2020) Muralidhar, N.; Kaliveeran, V.; Arumugam, V.; Srinivasula Reddy, I.Natural fiber polymer composites are gaining focus as low cost and light weight composite material due to the availability and ecofriendly nature of the natural fiber. Fiber composites are widely used in civil engineering, marine and aerospace industries where dynamic loads and environmental loads persist. Dynamic analysis of these composites under different loading and environmental conditions is essential before their usage. The present study focuses on the dynamic behavior of areca nut husk reinforced epoxy composites under different loading frequencies (5 Hz, 10 Hz and 15 Hz) and different temperatures (ranging from 28?C to 120?C). The effect of loading and temperature on storage modulus, loss modulus and glass transition temperature was analyzed. Increase in storage modulus is observed with increase in loading frequency. The storage modulus decreases with increase in temperature. The glass transition temperature of the composite is determined to be 105?C. The elastic modulus calculated from the DMA data is compared with three point bending test. © 2020 Polish Academy of Sciences. All rights reserved.Item HYDRODYNAMIC PERFORMANCES OF A WALL TYPE BREAKWATER-A PHYSICAL AND NUMERICAL APPROACH(Department of Naval Architecture and Marine Engineering, 2021) Kumaran, V.; Rao, M.; Rao, S.; Srinivasula Reddy, I.This paper investigates hydrodynamic performances of a wall-type breakwater through a physical model approach and validated using a numerical model based on the Volume of Fluid (VOF) method. The investigations are carried out for varying wave characteristics with the depth of water, 0.50 m. A 2D numerical wave flume is developed using ANSYS-Fluent platform by considering the VOF method and incompressible open channel fluid flow. The wave boundary conditions are adopted by solving the Reynolds-Averaged Navier Stokes equations (RANS equation) especially with the k—? model to examine the effects of turbulence on the numerical results. The hydraulic performance characteristics on the wall-type breakwater are analyzed for different wave characteristics. It is found that results obtained from the numerical investigations are in good agreement with the experimental ones. © 2021ANAME Publication. All rights reserved.Item Wear of dry sliding Al 6061-T6 alloy under different loading conditions(IGI Global, 2022) Srinivasula Reddy, I.; Kaliveeran, V.In the present work, wear of Al 6061-T6 alloy under different normal loads, sliding speeds, and temperatures was investigated. Pin on disk type tribometer was used to conduct dry sliding experiments. Different load combinations comprising of normal loads (1 kg, 1.5 kg, and 2 kg), sliding speeds (1.25 m/s, 2 m/s, and 3 m/s), and temperatures (room temperature [31 ± 1 °C], 60 °C, 100 °C, and 150 °C) were applied during dry sliding experiments. Adhesive and abrasive wear mechanisms were observed in dry sliding of Al 6061-T6 alloy contacts from the microscopic analysis of worn contact surfaces. The wear rate was more influenced by increase in normal load than increase in sliding speed and temperature. Under normal loads of 1 kg and 1.5 kg, Al 6061-T6 alloy showed better wear resistance at higher temperatures when compared to that at room temperature. © © 2022, IGI Global.