Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Mechanical

This study was performed to measure the extent of wear of unlubricated spur gears on the involute tooth. Contacts that roll and slide normally undergo wear. When material removal occurs due to surface wear from the gear profile, the surface pressure in the gear profile is redistributed. A mathematical model for predicting wear and wear pattern in spur gear has been developed. The prediction is based on wear-rate equation, load shared by the tooth in single-pair contact zone and double-pair contact zone. The distribution of the contact pressure was determined using the Hertzian cylindrical contact theory. For determining the sliding distance of the gears, the two-point observation method (TPOM) was used. Sliding distance at pitch point of gear and pinion was zero, because theoretically at pitch point, both zero sliding and pure rolling occur. The pin on the wear test method was used to obtain the wear-rate on the material and simplified to the time of measurement on the gear wear. Taguchi’s method for the design of the experiment was used, which significantly reduced experimental time with less experiment. Copyright © 2021 by ASME

World University root node

School of Mechanical Engineering

Chennai Campus

Journal of Tribology

Analytical and experimental studies on wear in spur gear running in dry condition

ECS Transactions

Sustainability Enhancement in Machining of DTC Titanium Alloy through Integrated Impact Assessment of Various Lubrication Strategies

In the modern days, use of vehicles is increasing rapidly. It is very essential that the vehicle must have a good control mechanism which ensures the safety of the vehicle. The brake system in automobile is one of the important control element which needs to be monitored. The unconditional brake leads to catastrophic failures. Hence, the brake system should be monitored regularly. An experimental study is proposed for the brake system monitoring using vibration signals. The vibration signals are captured under all possible brake conditions. The hidden information in the vibration are extracted as statistical features. We carry out the feature selection. Classification using the selected features is the final step in machine learning (ML). Meta family classifiers are used for the study. Among the considered classifiers, Bagging algorithm produced 80.8 % accuracy for monitoring the brake condition.

Journal of Physics: Conference Series

Application of Meta family Classifiers for monitoring hydraulic brake system using vibration based statistical learning approach

A sudden failure of a product or a component may result in loss of valuable data or interruption in the task being carried out. In order to eliminate these kind of scenarios and to avoid unnecessary investments on the used products, the remaining life need to be predicted/estimated. In this work, a comprehensive two-phase approach is proposed. In the first stage phase, statistically analyzing the behavior of components for reuse, a well-known reliability assessment method, the Weibull analysis, is applied to the time-to-failure data to assess the mean life of components. In the second phase, the degradation and condition monitoring data are analyzed by developing an Artificial Neural Network model (ANN model). This project is aimed on estimating the remaining useful life of washing machine and LED bulb. © 2021 Institute of Physics Publishing. All rights reserved.

Fulltext

Remaining useful life estimation of a product

This paper presents a detailed and objective review of regenerative flow turbomachines, namely pumps, blowers and compressors. Several aspects of turbomachines like design and operating parameters, working principle, flow behaviour, performance parameters and analytical and Computational Fluid Dynamics (CFD) related details have been reviewed and summarized. Experimental work has been put in perspective and the most useful results for optimized performance have been presented. Consolidated plots of specific speed-specific diameter have been plotted which can be helpful in the early stages of design. Industrial outlook involving details of suppliers from various parts of the world, their product description and applications too are included. Finally, future research work to be carried out to make these machines widespread is suggested. This review is targeted at designer engineers who would need quantitative data to work with. © IMechE 2021.

Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy

Regenerative flow pumps, blowers and compressors – A review

Performance of elevated temperature grain refinement and texture analysis are investigated in the temperature range of 500 °C, 600 °C, 700 °C and 800 °C in this study. Electron Back Scattered Diffraction (EBSD) was used for observation of grain distribution of Inconel 718. Tensile test was performed for all the heat treated samples and the fractrographic was examined using Scanning Electron Microscope (SEM). In addition, the texture of Inconel 718 was examined using crystallographic textures and Orientation Distribution Function (ODF) plots. The results indicate that Inconel 718 heat treated with 800 °C shows better grain refinement and provide optimum texture. Furthermore, it also indicated that decreased grain size contributed to the decreased cleavage size that leads to increased ductility. © 2021 Elsevier B.V.

Materials Letters

Grain size refinement, texture analysis and effect on the tensile properties of a novel Inconel 718

The chilled cast iron tappet comprises three gradient microstructures, including chill, mottle, and gray iron. In this work, the effect of Tellurium (Te) on the chilled iron tappet’s microstructure and properties is studied. The addition of Te to gray cast alloy enhances its mechanical and thermal properties, which can be used in new designing of materials for heavy automotive applications. The gray cast iron alloy with 0.01 to 0.05 wt.% of Te was prepared in order to examine the effect of Te wt.% on the chill depth, microstructure, wear, and hardness. The scanning electron micrographs are used to distinguish and analyze the chill zone, mottle, and gray zone in the tappet, and the hardness was studied by Vickers hardness test, and wear behavior by a pin on disc method was measured. The present study showed that the addition of Te strongly influenced the formation of chill and efficiently enhanced the tappet’s mechanical properties along with the favorable effect to eliminate the mottled zone and separate the chill zone and gray zone with a clear boundary. © 2021 Taylor & Francis.

Materials and Manufacturing Processes

Experimental investigation of Te addition on chilled cast iron tappet manufacturing process

In electronic and electric instruments, heat dissipation is one of the major issues that degrade performance and efficiency. Polymer material has high specific strength and modulus, and it is mainly used in electrical insulation materials due to easy processability and light in weight with great flexibility but has low thermal conductivity. This paper examines the recent developments in highly thermal conductive epoxy-based polymer composites. First, the composite materials, with applications, are briefly introduced. Second, the thermally conductive polymer types with their thermal conductivity are summarized. Third, the thermal and electric properties of different boron nitride (BN) with epoxy-filled composite are listed. It also focuses on enhancement in thermal conductivity and electrical insulation, which are mainly influenced by the microstructure and amount of filler content. Some highly thermal conductive BN polymer based composites are reviewed. Fourth, various thermal conductivity measurement techniques are listed with their drawbacks. Finally, the review gives current scenario on thermal conductive polymer materials and developments needed with challenges in this area. © 2021 Society of Plastics Engineers

Polymer Composites

Thermal and Electrical behaviors of Boron Nitride/Epoxy reinforced polymer matrix composite—A review

The evolution of a sustainable green composite in various loadbearing structural applications tends to reduce pollution, which in turn enhances environmental sustainability. This work is an attempt to promote a sustainable green composite in buckling loadbearing structural applications. In order to use the green composite in various structural applications, the knowledge on its structural stability is a must. As the structural instability leads to the buckling of the composite structure when it is under an axial compressive load, the work on its buckling characteristics is important. In this work, the buckling characteristics of a woven flax/bio epoxy (WFBE) laminated composite plate are investigated experimentally and numerically when subjected to an axial compressive load. In order to accomplish the optimization study on the buckling characteristics of the composite plate among various structural criterions such as number of layers, the width of the plate and the ply orientation, the optimization tool “response surface methodology” (RSM) is used in this work. The validation of the developed finite element model in Analysis System (ANSYS) version 16 is carried out by comparing the critical buckling loads obtained from the experimental test and numerical simulation for three out of twenty samples. A comparison is then made between the numerical results obtained through ANSYS16 and the results generated using the regression equation. It is concluded that the buckling strength of the composite escalates with the number of layers, the change in width and the ply orientation. It is also noted that the weaving model of the fabric powers the buckling behavior of the composite. This work explores the feasibility of the use of the developed green composite in various buckling loadbearing structural applications. Due to the compromised buckling characteristics of the green composite with the synthetic composite, it has the capability of replacing many synthetic composites, which in turn enhances the sustainability of the environment. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Polymers

Experimental and numerical analyses on the buckling characteristics of woven flax/epoxy laminated composite plate under axial compression

In this work grain boundary (GB) wetting phase transition of Inconel 718 is investigated. 15% GBs are totally wetted when the temperature is raised to 1200 °C. GB was characterized using Electron Backscattering Diffraction (EBSD). The experimental results revealed that the wetted GB fraction increases to 80% at 1200 °C and no evidence of transformation beyond this limit. The GBs clearly show that the wetting state and the cooling rate at about 1200 °C are almost similar to that of quenching. Under ambient condition, it exhibits low ductility which leads to the formation of second phase and increase in hardness and decrease of tensile strength. © 2021 Elsevier B.V.