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Tonk, Ravinder
- Impact and Measurement Techniques of Residual Stress in Welding of Bimetallic Material
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1 Mechanical Engineering Department, Chandigarh University, Gharuan, Mohali - 140413, Punjab, IN
2 Applied Sciences Department, Chandigarh University, Gharuan, Mohali - 140413, Punjab, IN
1 Mechanical Engineering Department, Chandigarh University, Gharuan, Mohali - 140413, Punjab, IN
2 Applied Sciences Department, Chandigarh University, Gharuan, Mohali - 140413, Punjab, IN
Source
Indian Journal of Science and Technology, Vol 9, No 43 (2016), Pagination:Abstract
Objectives: The welding techniques are being developed at a very fast pace with novel and efficient techniques coming up for unconventional cases such as dissimilar metal joints between plates of various types, which have various practical applications, like in nuclear power plants. Methods/Statistical Analysis: A few strategies and procedures have been proposed furthermore have been connected for measuring residual stress (σR) in a few metals. Some of such strategies are: stress relaxation procedures, X-Ray Diffraction methods, Techniques utilizing stress touchy properties and Cracking systems. In addition, endeavors have additionally been made to use ultrasonic and hardness strategies to decide remaining burdens in metals by measuring stress sensitivity properties. Finding: Failure investigations of many dissimilar joints and literature review have revealed that several failures of the dissimilar welded joints have taken place in the Heat Affected Zone [HAZ]. One of the major reasons for failure of dissimilar welded joints is the untreated left residual stresses. In the present paper a brief description of the ideology of bimetallic weld processes, their capabilities and restrictions, phenomenon and types of σR and their treatment techniques is presented. The overall impact of σR and their measurement techniques have also been discussed. Application/Improvements: There are numerous applications of dissimilar metal joints such as in automotive industry, power generation industry etc.Keywords
Dissimilar Metals, Residual Stress (Σr), Measuring Techniques of Σr.- Recent Advances in Science and Technology of Single and Multi Wall Carbon Nanotubes and their Composites
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Affiliations
1 Department of Mechanical Engineering Chandigarh University, Gharuan -140413, District Mohali, Punjab, IN
2 Department of Applied Sciences Chandigarh University, Gharuan - 140413, District Mohali, Punjab, IN
1 Department of Mechanical Engineering Chandigarh University, Gharuan -140413, District Mohali, Punjab, IN
2 Department of Applied Sciences Chandigarh University, Gharuan - 140413, District Mohali, Punjab, IN
Source
Indian Journal of Science and Technology, Vol 9, No 41 (2016), Pagination:Abstract
Subsequent to their first perception more than two decades ago, Carbon Nanotubes (CNTs) have formed the epicenter for numerous important studies. Various researchers and scientists have stated striking bodily and perfunctory features for this unique form of carbon. These exhibit one of a kind microelectronic features and thermal conductivity greater than diamond and also mechanical features where the mechanical and electrical features, quality and flexibility surpasses any present material, study of CNTs offers many options for the improvement on a very basic level of new material frameworks. Specifically, the excellent mechanical features of CNTs, consolidated with their small width, propose degree aimed at advancement of Nanotube strengthened compound resources. The scope for nanocomposites strengthened with carbon tubes having remarkable improved mechanical features offer a lot of scope of rapid development in the field of science. This research study gives compact assessment of late developments in CNTs and related compounds. Also presented in this paper are details regarding configuration and handling of CNTs.Keywords
CNTs, Characterization of Nanotubes, Single and Multi Wall CNTs.- To Study the Effect on the Viscoelastic Properties of a Mineral Base Engine Oil Additivated by Functionalized Multi Walled Carbon Nanotubes
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Authors
Affiliations
1 Department of Mechanical Engineering, Chandigarh University, Gharuan Mohali, Punjab -140413, IN
2 Department of Applied Sciences, Chandigarh Engineering College, Landran Mohali, Punjab - 140307, IN
1 Department of Mechanical Engineering, Chandigarh University, Gharuan Mohali, Punjab -140413, IN
2 Department of Applied Sciences, Chandigarh Engineering College, Landran Mohali, Punjab - 140307, IN
Source
Indian Journal of Science and Technology, Vol 11, No 28 (2018), Pagination: 1-7Abstract
The lubricants are most important component of any moving machinery system which helps to reduce the friction and thus overall wear and tear. Objectives: The important viscoelastic properties such as shear rate, shear stress, viscosity, Torque etc. of additivated mineral oil was investigated using a Rheometer and ultrasonic velocity measurements were conducted using nano fluid interferometer. Method: In the current experimental work, Multi Walled Carbon Nanotubes (MWCNT) were coated with stearic acid (carboxylic group) in order to investigate their viscoelastic properties as wear reduction additive for a mineral base engine oil (SAE 20W50). The functional MWCNTs were examined by FTIR technique, Scanning Electron Microscopy (SEM) and Field Emission Scanning Electron Microscopy (FESEM). The MWCNTs were then dispersed in a mineral oil by ultrasonication. Findings: The results show that by functionalization of MWCNTs, the viscoelastic properties of the base mineral oil improved as more stable bonds were created on metallic surface due to improved absorption qualities. It was also deduced that due to coating of MWCNTs with carboxylic group stearic acid, the stability of suspension is high and it does not coagulate even after few months. Applications: The improved additivated engine oil finds applications in almost all major automobile uses and to reduce the harmful effect on the environment.References
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- Investigation of the Viscoelastic and Thermo-Physical Properties of Mineral Base Engine Oils Containing Multi Walled Carbon Nanotubes
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Authors
Affiliations
1 Department of Mechanical Engineering, Chandigarh University, Gharuan, Mohali – 140413, Punjab, IN
2 Department of Applied Sciences, Chandigarh Engineering College, Landran, Mohali – 140413, Punjab, IN
3 Department of Electronics, CSIO-AcSIR, Chandigarh – 160017, Punjab, IN
1 Department of Mechanical Engineering, Chandigarh University, Gharuan, Mohali – 140413, Punjab, IN
2 Department of Applied Sciences, Chandigarh Engineering College, Landran, Mohali – 140413, Punjab, IN
3 Department of Electronics, CSIO-AcSIR, Chandigarh – 160017, Punjab, IN
Source
Indian Journal of Science and Technology, Vol 11, No 28 (2018), Pagination: 1-4Abstract
It is a known fact now that the commercially available lubricating oils depict lower thermo-physical features when compared with lube oils with antiwar additives. Objective: The thermo-physical and viscoelastic properties such as shear rate, shear stress, viscosity, Torque and ultrasonic velocity of additivated mineral base engine oils were calculated and studied for improvement markers. Method: In the current experimental work, samples were prepared for two different mineral base engine oils of 20W50 grade with one sample each of base fluid and three each with multi walled carbon nanotubes coated with stearic acid (carboxylic acid) added in 0.1 %, 0.3% and 0.5% wt concentration to base sample respectively. The Multi walled carbon nano tubes (MWCNTs) were then dispersed in a mineral oil by ultrasonication. The properties were investigated using a Rheometer (viscoelastic properties), ultrasonic velocity measurements were conducted using nano fluid interferometer and thermal conductivity was recorded using KD2 pro thermal property analyser apparatus. A comparative analysis is given in this paper. Findings: The results show that by functionalization of MWCNTs, the viscoelastic properties of the base mineral oil improved as more stable bonds were created on metallic surface due to improved absorption qualities. It was also deduced that due to coating of MWCNTs with carboxylic group stearic acid, the stability of suspension is high and it does not coagulate. Applications: The applications and benefits are numerous including automobile sector, heavy machinery sector etc.References
- Choi S. Enhancing thermal conductivity of fluids with nanoparticles. D.A. Siginer. 1995.
- Tonk R, Ajay Vasishth, Aggarwal DK. Recent advances in science and technology of single and multi wall carbon nanotubes and their composites. Indian Journal of Science and Technology. 2016; 9(41):1–5. https://doi.org/10.17485/ ijst/2016/v9i41/101469.
- Thostenson ET, Ren Z, Chou TW. Advances in the science and technology of carbon nanotubes and their composites: A review. Composites Science Technology. 2001; 61(13):1899–912. https://doi.org/10.1016/S0266-3538(01)00094-X.
- Hwang Y, Lee JK, Jung WH. Thermal conductivity and lubrication characteristics of nanofluids. Current Applied Physics. 2006; 6(1):67–71. https://doi.org/10.1016/j.cap.2006.01.014.
- Xie H. Thermal conductivity enhancement of suspensions containing nanosized alumina particles, Journal of Applied Physics. 2002; 91(7):4568–72. https://doi.org/10.1063/1.1454184.
- Maga SEB. Heat transfer behaviors of nanofluids in uniformly heated tube. Super lattices and Microstructures. 2004; 35(3–6):543–57. https://doi.org/10.1016/j.spmi.2003.09.012.
- Xuan Y, Roetzel W. Conception for heat transfer correlation of nanofluids. International Journal of Heat Mass Transfer. 2000; 43(19):3701–7. https://doi.org/10.1016/S00179310(99)00369-5.
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- Study of Important Performance Characteristics of Commercially Available Two and Four Stroke Engine Lubricants
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Authors
Affiliations
1 Department of Mechanical Engineering, Chandigarh University Mohali, Sahibzada Ajit Singh Nagar - 140413, Punjab, IN
1 Department of Mechanical Engineering, Chandigarh University Mohali, Sahibzada Ajit Singh Nagar - 140413, Punjab, IN
Source
Indian Journal of Science and Technology, Vol 11, No 28 (2018), Pagination: 1-10Abstract
Background/Objectives: In this paper, a complete study and experimentation of engine lubricants or engine oils with the help of viscosity grades through the mathematical formulas and experimental data having different viscosity grade of lubricants at different temperature. Methods/Statistical Analysis: For analyze the viscosity, density and thermal conductivity with the assistance of Redwood viscometer, Hydrometer and Transient hot-wire method, and reciprocal of thermal conductivity (k) is called thermal resistivity (r). Engine oils 10W40, 10W30, and 15W40 are selected for testing. Findings: in these different types of engine oil tests, four parameters (viscosity, thermal conductivity (k), density, thermal resistivity and 126 experiments were performed with four different temperature 30°C, 40°C, 50°C, and 60°C, which shows the comparisons of different engine lubricants at same viscosity grade. Applications: The oil lubrication pollution against the motor part wear, leading the loss of engine performance and life, the dynamic engine oil or lubricant oil films confine moving portion surfaces cause a the significant bit of the engine wear. In the engine lubrication system, viscosity plays important role, wearing of the automated parts. There are different lubricants are in market having different viscosity grades. A mechanical or automated engine is a completed machine; it comprises of several moving parts. The moving part of the automated or mechanical engine is driven under different temperature and pressure ranges to reduce the friction or erosion and control wear. Engine oil plays the important role, so the oil action and specifications reduce the friction or erosion and control the engine wear behavior, the viscosity is one of the most important parameter of the engine oil specifications, the viscosity comprises and shows the number of forces or power between the oil particles.References
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