Qualification: 
M.E
v_ravikumar@blr.amrita.edu

Mr. Ravi Kumar V. is currently serving as Assistant Professor (Sr.Gr.) at the Department of Mechanical Engineering, School of Engineering, Amrita Vishwa Vidyapeetham, Bangalore campus. He is currently pursuing his Ph. D.

Education

  • 2021: Pursuing Ph.D. in Mechanical Engineering
    VTU, Belagavi
  • 2003: M.E. in Machine Design
    UVCE, Bangalore, Bangalore University
  • 2000: B.E. in Mechanical Engineering
    UVCE, Bangalore, Bangalore University

Professional Appointments

Year Affiliation
July 2007- Till Date Asst. Professor (Sr. Grade), Amrita School of Engineering, Bengaluru
July 2006 - June 2007 Lecturer, Amrita School of Engineering, Bengaluru
July 2003 - June 2006 Lecturer, New Horizon College of Engineering

Major Research Interests

  • Machine Design, Nanocomposite, Sensors, Mechatronics

Publications

Publication Type: Journal Article

Year of Publication Title

2020

Ravi Kumar V., R., P. K., and K.S., N., “Strain sensing and characterization of CNFs wrapped with polyaniline/polypyrrole based polyester composites”, Mechanical and Production Engineering Research and Development, vol. 10, no. 2, 2020.

2019

Shashi Kumar M. E., S. Mohan Kumar, and Ravi Kumar V., “Effect of Cryogenic Treatment on Bisphenol Based Polymer Composite on Mechanical Properties”, International Journal of Recent Technology and Engineering, vol. 8, no. 3, pp. 2413-2420., 2019.[Abstract]


Presently there are lot of materials that can be used in the fabrication of any item, so choosing a material is a major criteria. So the materials are chosen depending on the properties desired by the resulting item. The composite materials have better properties when compared with its individual components, metals and ceramics. The overall appeal of the product depends mainly on its durability, aesthetics and its final cost. Composite materials are cost effective and significantly satisfy the needs of the clients. By utilizing composite materials we can obtain high strength to weight ratio at a relatively economical cost. Moreover, they can be produced easily by basic part forming. Hybrid polymer composites have been studied of late which improves a specific property of the composite that is under question. Here a hybrid composite made of laminate of Nomex and HS glass sheets with varying percentage (1% - 2.5 %) of bisphenol dispersed in resin is prepared. The same samples were subjected to cryogenic treatment (24 hrs and 72 hrs). The results of tensile strength, flexural strength and hardness were compared for all the specimens 24 hrs cryogenic, 72hrs cryogenic and non-treated specimens. The results showed that the hardness of the cryogenic treated bisphenol based PMCs has increased with the weight percentage of Bisphenol indicating the fact that the laminates can withstand more loads at subzero temperatures The increase observed was about 3 – 4 % more in terms of BHN number. At the same time the tensile and flexural strengths have considerably reduced after treating the PMC cryogenically as the laminates becomes more brittle when treated. The tensile strength increased by about 10% approximately and the flexural strength reduced by 300%

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2019

Dileep B. P., Ravi Kumar V., Vital, H. R., and Shivraj, J., “Effect of nickel on mechanical and tribological properties of Al 6082”, Materials Today: Proceedings, vol. 16, pp. 470-476, 2019.[Abstract]


The main intention of this research is to investigate the Corrosion Resistance, Hardness and Wear properties of Al-6082 by varying percentage of Nickel as an alloying element. Fabrication of Al-6082-Ni alloy is done using Liquid Metallurgy Technique. Nickel in powder form (60µ) is added to molten Al-6082 in 2%,4%,6%,8% by its weight and separate specimens of different percentage of Nickel are casted by pouring a homogenous molten metal mixture into a split-die. Casted Al-6082 specimens with varying percentages of Nickel are machined according to ASTM standards, followed by a series of experiments to determine variation in Hardness, Corrosion Resistance and Wear properties. It is observed that Al-6082 with increase in percentage of Nickel showed almost 10-40% increase in its Hardness along with significant increase in both Corrosion Resistance and Wear properties compared to its purest form. © 2019 Elsevier Ltd. All rights reserved. Selection and/or Peer-review under responsibility of International Conference on Materials Manufacturing and Modelling (ICMMM - 2017).

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2019

Prakash Marimuthu K., S. Mohan Kumar, Ravi Kumar V., and Govindaraju, H. K., “Characterization of mechanical properties of epoxy reinforced with glass fiber and coconut fiber”, Materials Today: Proceedings, vol. 16, pp. 661-667, 2019.[Abstract]


The present work deals with the characterisation polymer matrix composites combining glass fiber and fiber got from coconut. The composite was prepared using hand layup process and sufficient precaution has been taken to ensure there is homogeneity. The composite is composed of 60% epoxy resin, 10% glass fiber and 30% coconut fiber. Various mechanical tests like micro hardness test, tensile strength, impact strength test has been carried out to characterise the composite. The various mechanical properties like density, micro hardness and tensile strength are affected when the coconut fibers were added. The impact strength and flexural strength of the composite increases while ultimate tensile strength decreases. The study has come up with prospective results and further research has to be done to examine the effect of fiber content, fiber orientation, loading pattern etc. Studies on corrosive wear and other tribological properties can reveal newer things, which can enable us to use the composite that is combination of epoxy and coconut fibers in newer and newer applications.

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2018

A. Ranganathan, Krishnan, P. V. Akshay, Nambiar, A. S., S. Mohan Kumar, and Ravi Kumar V., “Mechanical Characterization of AA7050-TiC Metal Matrix Composites under as Cast as condition”, Materials Today: Proceedings, vol. 5, pp. 25368-25375, 2018.[Abstract]


<p>The present works describes the mechanical properties of AA 7050 metal matrix composites reinforced with TiC. TiC particles of size 325 mesh was taken as the reinforcement material to prepare the metal matrix composites using stir casting technique. The percentage of reinforcement varied from 0 to 6% wt in steps of 2%. Mechanical characterization, such as tensile strength, hardness test, density tests were conducted as per ASTM standards. Experiment results reveal that there is an improvement in Ultimate tensile strength and hardness properties with the increase in the percentage of reinforcement. Optical microscopy technique was used to examine microstructures of the sample specimens and the microstructure revealed uniform distribution of particles and presence of reinforcements in the matrix phase. Experimental studies invokes that the 6%wt of TiC increases the tensile strength by 9% and hardness values by 10% comparing with that of as cast AA7050. Results also evident that there was a decrease in ductility and percentage of elongation with the increase in the percentage reinforcement.</p>

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2018

B. P. Dileep, Vitala, H. R., Ravi Kumar V., and Suraj, M. M., “Effect of ECAP on Mechanical and Micro-Structural Properties Of Al7075-Ni Alloy”, Materials Today: Proceedings, vol. 5, pp. 25382-25388, 2018.[Abstract]


This research work is mainly focused on to study microstructure and mechanical properties of nickel reinforced aluminum 7075 alloy composites by equal-channel angular pressing (ECAP) process and ultrafine grained (UFG) of nickel reinforced aluminum 7075 alloy composites. The composites were prepared using liquid metallurgy technique. The content of nickel in the composition was varied from 2 to 8% (by weight) in steps of 2%. The ECAP processing was carried out using die with an intersecting channel angle of 120°. X-Ray Diffraction Technique (XRD) was used to confirm the percentage of reinforcement of in the composites. This study shows that severe plastic deformation has significantly improved the mechanical properties of nickel reinforced aluminium 7075 alloy composites compared to an alloy. Hardness test confirms that there is an increase in hardness for ECAPed samples at 8wt. % Ni and is 11% increase as compared to ECAPed pure Al7075 alloy and 40% compared to Non ECAPed 8wt. % Ni sample.

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2018

H. R. Vitala, Dileep B. P., and Ravi Kumar V., “Micro structural Study of Equal-Channel Angular Pressing (ECAP) performed and Ultra Fine Grained of Nickel Reinforced Aluminium 7075 Alloy Composites”, IOP Conference Series: Materials Science and Engineering, vol. 377, p. 012032, 2018.[Abstract]


Microstructure and mechanical properties of equal-channel angular pressing (ECAP) processed and ultrafine grained (UFG) of nickel reinforced aluminium 7075 alloy composites were investigated. The composites were prepared using liquid metallurgy technique. The content of nickel in the composition was varied from 2 to 8% (by weight) in steps of 2%. The ECAP processing was carried out using die with an intersecting channel angle of 120°. Pin-on disc equipment was used for wear testing and X-Ray Diffraction Technique (XRD) was used to confirm the percentage of reinforcement of in the composites. This study shows that severe plastic deformation has significantly improved the mechanical properties of nickel reinforced aluminium 7075 alloy composites compared to an alloy.

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2018

Dileep B. P., Ravi Kumar V., and Vital, H. R., “Mechanical and Corrosion Behavior of Al-Ni-Sic Metal Matrix Composites by Powder Metallurgy”, Materials Today: Proceedings, vol. 5, pp. 12257 - 12264, 2018.[Abstract]


Aluminium as matrix in particular have been vastly investigated, this is because of the diverse applications of aluminium due to its excellent properties. Material scientists always face a challenge when it comes to the tribological and mechanical properties of aluminium, as it exudes quite poor behaviour in these aspects. Hence this work aims to improve the mechanical and corrosive resistance of Aluminium by reinforcing with Silicon Carbide and Nickel through powder metallurgy technique. Al-Ni-SiC composite with percentage of Ni fixed at 4% and SiC varied through 2-8% in increments of 2% were fabricated via powder metallurgy technique. The Optimized Load of 210kN and 560°C sintering temperature was used in the technique. The hardness value of the aluminium matrix composites improved with increased percentage of SiC, maximum increase was obtained for 8% SiC composite, showing an increase of about 87%. The wear resistance property of the prepared composites improved significantly with the increased percentage of SiC. There was anoticeable improvement in the corrosion resistance of the aluminium composites compared to its purest form, due to the presence of Ni. However, the increase in SiC percentage decreased the corrosion resistance. The maximum increase was obtained for 2% SiC composite, with an increase of 18.2%

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2018

S. Mohan Kumar and Ravi Kumar V., “Simplified Method to Predict Fatigue Crack Growth Life by Combining Finite Element Method and Willenborg's Model”, International conference on Emerging Trends in Mechanical Engineering, vol. 2080, 2018.[Abstract]


Among various cold expansion methods, Split Sleeve Cold Expansion technique is widely used. This method induces a zone of compressive residual stresses by pulling an oversized mandrel followed by removal through the hole. An appropriate amount of compressive residual stress reduces the severity of tensile stresses acting on the components there by retarding the fatigue crack growth rate or extending the service life of the components. It has been observed that either extensive testing or special computer codes (AFGROW) are required to determine fatigue crack growth life around residual stress fields. There was no generalized procedure to predict fatigue crack growth life around residual stress fields of cold expanded holes. An attempt has been made in this work to develop a systematic, simplified method to predict fatigue crack growth life around cold expanded holes by combining finite element method and Willenborg's model. This method was in very good agreement to the classical approach and the variation of predication of fatigue crack growth was about 5.77% compared to the classical approach. The outcome of this work is the development of a systematic and simple procedure for predicting fatigue crack growth life around cold expanded fastener holes. This procedure helps in recommending appropriate inspection intervals and extending the service life of fatigue prone fastener holes.

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2018

Ravi Kumar V. and Prakash, K. R., “Mathematical modeling of unsaturated isophthalic resin’s curing cycle”, International Journal of Mechanical and Production Engineering Research and Development, vol. 8, pp. 805-810, 2018.[Abstract]


Fiber reinforced plastics (FRP) products are light weighing and strong. These materials find extensive applications in various engineering fields and also as sensor metarial. Curing of this resin is a key to obtain FRP Products. Various factors including Gel time (Tgel) and peak exothermic temperature (Tpeak) are the critical factors that directly affect the curing process. Tgel is the indicator for the commencement of setting (polymer cross-linking) while Tpeak talks about the shrinkage and cracking of the polymer. This research work finds the Tgel and Tpeak for the curing of UP resin based isophthalic acid. The Catalyst MEKP (methyl ethyl ketone peroxide). The accelerator cobalt octoate (Cost) were used for the curing process. Results showed strong interactions between the process variables mentioned above. The process was anoptimization to achieve a combination of Tgel and Tpeak within the regime of experimentation. Mathematical models were developed using regression for both peak temperature and gel time. Confirmatory experiments were performed to validate the predicted results.

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2017

M. S. Kumar, Ravi Kumar V., Kumar, M. E. Shashi, and Govindaraju, H. K., “Mechanical characterization and fracture toughness of electroplated cadmium coating of Al –Zn alloy, T6”, AIP Conference Proceedings, vol. 1859, p. 020085, 2017.

2017

D. Krishna, S. Mohan Kumar, Jyothish, J., Kumar, Aa, and Ravi Kumar V., “Electrochemical corrossion studies and mechanical characterization of al7050 metal matrix composite reinforced with ZRO2 particulate by stir casting method”, International Journal of Mechanical Engineering and Technology, vol. 8, no. 11, pp. 949-957, 2017.

2017

Ravi Kumar V., Dileep B. P., and Vital, H. R., “Tribological and mechanical characterization of Al-Ni-SiC metal matrix composites”, AIP Conference Proceedings, vol. 1859, 2017.[Abstract]


Aluminium being light weight metal used widely in many engineering applications. It's being a highly ductile material in its purest form also limits its applications in load carrying members. Addition of alloying elements like nickel and silicon carbide can make aluminium a better material for many applications. In this work aluminium metal matrix composite is prepared by adding nickel powder of 30 microns4% and silicon carbide of 45 microns in 2,4,6and 8% by weight of matrix material. Composite was prepared by using a powder metallurgy (PM) at room temperature compaction. The compaction load was optimized to 15tonns for successful fabrication of green specimen; these green specimens were sintered in a furnace to 5400 temperatures and furnace cooled. It was found that reinforcement of nickel and silicon carbide significantly improved the mechanical properties of the composite; hardness is improved by 35% in that compaction load. Wear rate of the composite is reduced from 200 micrometers to 50 micrometers for 5000 meters of track length at a load of 5N. The prepared composite also shown a uniform distribution of reinforcement particle in the matrix material under micro structural studies.

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2014

H. S. Balasubramanya, J. Basavaraja, S., Srinivas, S., and Ravi Kumar V., “Wear Rate Behavior of As-cast and Heat Treated Hybrid Aluminum Metal Matrix Composites”, Procedia Materials Science, vol. 5, pp. 1049-1055, 2014.[Abstract]


In the present study the effect of sliding speed on wear behaviour of as-cast and heat treated Aluminum alloy/composites has been investigated. Aluminum alloy series A356 is used as matrix, Silicon Carbide particles (SiCp) and graphite (Gr) particles are used as reinforcements. The proposed Aluminum Metal Matrix Composites (AMMCs) were fabricated by stir-casting. In the Aluminum A356 matrix, the reinforcement SiCp was varied from 0 to 9% by weights in steps of 3%, in addition to it 3% by weight Gr particles was also added. The castings were machined as per ASTM standard and T6-heat-treatment was carried out. Specimens were aged at different durations of 3, 6, 9, and 12hrs at a temperature of 155° C. The pin-on-disc wear testing machine was used to evaluate the wear rate of the composites. The results revealed that by increasing the reinforcement and ageing at T6-9hrs showed a maximum wear resistance in all the sliding tests. The reinforcements were restricted to 9% by weight due to the formation of agglomeration. The increase in sliding speed showed an increase of wear rate. The wear tested samples were examined for microstructure using scanning electron microscope (SEM) and the composition of worn out surface was confirmed using energy dispersive spectrum (EDS).

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2014

Dileep B. P., Ravi Kumar V., Mrudula Prashanth, and M. V. Phanibhushana, “Effect of zinc coating on mechanical behavior of Al 7075”, Applied Mechanics and Materials, vol. 592-594, pp. 255-259, 2014.[Abstract]


The addition of zinc to aluminum with magnesium or copper produces heat treatable alloys of highest strength which can be used for structural applications. This work is an attempt to investigate any improvement in hardness and fracture toughness by coating aluminum 7075 alloy with zinc. The zinc coated aluminum 7075 alloy was fabricated using Time Dependent Electro- Plating Technique. The varying thickness of zinc coating was obtained based on the time estimates, which includes 10, 15 and 20 μ. Specimens were prepared according to ASTM standards, which were then tested for mechanical properties such as surface hardness, tensile strength and fracture toughness at different loading conditions. A significant improvement in hardness was seen with the coating, but remained constant for further increase in coating thickness. The yield stress of zinc coated aluminum alloy increased (587.11 N/mm2)when compared to uncoated aluminum alloy 7075 - T6 (537.12 N/mm2), with an increase in brittleness. The fracture toughness test on CT specimen under plain strain condition for coated specimen showed an increase in KIC value by 7.25 % compared to that of uncoated aluminum 7075-T6 alloy. Optical microscopy analysis shows that there is a good bonding of zinc coating on aluminum. © (2014) Trans Tech Publications, Switzerland.

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2011

Ravi Kumar V., “Electrical properties of CNTs and CNFs – A comparative study”, The National Institute of Engineering , Mysuru, 2011.

2009

Ravi Kumar V., “Simulation of small holes used in Gas Turbine Dome, National Conference on Thermal”, Fluid and Energy Engineering, 2009.

2009

Ravi Kumar V., “Fundamentals of gas turbine combustion and simulation of small holes used in gas turbine dome”, National Conference on Recent Trends in Mechanical Engineering , 2009.

2009

Ravi Kumar V., “Comparison of performance & emissions from Diesel fuel and its blend in CI engines”, TDRES-09, 2009.

Courses Taught

  • Control Engineering,
  • Engineering Drawing
  • Machine Design I and II
  • Kinematics of Machines
  • Dynamics of Machines
  • C Programming
  • OOPS
  • Data Structures
  • Operations Research
  • Engineering Management
  • MAT Lab
  • Machine Drawing