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ENGINEERING (1448 journals)            First | 1 2 3 4 5 6 7 8     

Showing 1401 - 1205 of 1205 Journals sorted alphabetically
Transportation Research Record : Journal of the Transportation Research Board     Full-text available via subscription   (Followers: 32)
Transportmetrica A : Transport Science     Hybrid Journal   (Followers: 8)
Trends in Applied Sciences Research     Open Access   (Followers: 1)
Tribology in Industry     Open Access   (Followers: 4)
Tribology International     Hybrid Journal   (Followers: 46)
Tribology Letters     Hybrid Journal   (Followers: 7)
Tribology Transactions     Hybrid Journal   (Followers: 35)
Trilogía     Open Access  
Turkish Journal of Engineering     Open Access  
Turkish Journal of Engineering and Environmental Sciences     Open Access   (Followers: 1)
Türkiye Arazi Yönetimi Dergisi     Open Access  
Türkiye Coğrafi Bilgi Sistemleri Dergisi     Open Access  
Türkiye Fotogrametri Dergisi     Open Access  
Türkiye İnsansız Hava Araçları Dergisi     Open Access  
U.Porto Journal of Engineering     Open Access  
UKH Journal of Science and Engineering     Open Access  
Ultramicroscopy     Hybrid Journal   (Followers: 4)
Uludağ University Journal of The Faculty of Engineering     Open Access  
Uluslararası Mühendislik ve Teknoloji Araştırmaları Dergisi / International Journal of Engineering and Technology Research     Open Access  
Universal Journal of Applied Science     Open Access   (Followers: 2)
Universal Journal of Engineering Science     Open Access   (Followers: 2)
Universidad, Ciencia y Tecnología     Open Access   (Followers: 1)
Usak University Journal of Engineering Sciences     Open Access  
Utilities Policy     Hybrid Journal   (Followers: 2)
Vacuum     Hybrid Journal   (Followers: 12)
Vestnik of Don State Technical University     Open Access  
Vibration     Open Access   (Followers: 16)
Virtual and Physical Prototyping     Hybrid Journal   (Followers: 4)
Visualization in Engineering     Open Access   (Followers: 1)
Walailak Journal of Science and Technology     Open Access  
Waste and Biomass Valorization     Hybrid Journal   (Followers: 3)
Waste Management Series     Full-text available via subscription   (Followers: 1)
Waves in Random and Complex Media     Hybrid Journal  
Waves, Wavelets and Fractals - Advanced Analysis     Open Access  
Wear     Hybrid Journal   (Followers: 27)
Welding in the World     Hybrid Journal   (Followers: 7)
West African Journal of Industrial and Academic Research     Open Access   (Followers: 2)
World Electric Vehicle Journal     Open Access  
World Journal of Engineering and Technology     Open Access  
World Journal of Environmental Engineering     Open Access   (Followers: 3)
World Pumps     Full-text available via subscription   (Followers: 2)
World Science and Technology     Full-text available via subscription  
Yugra State University Bulletin     Open Access   (Followers: 1)
ZDM     Hybrid Journal   (Followers: 1)
Zede Journal     Open Access   (Followers: 1)
Zeitschrift für Arbeitswissenschaft     Hybrid Journal  
Zeitschrift fur Energiewirtschaft     Hybrid Journal  
Вісник Приазовського Державного Технічного Університету. Серія: Технічні науки     Open Access  

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Tribology in Industry
Journal Prestige (SJR): 0.429
Citation Impact (citeScore): 1
Number of Followers: 4  

  This is an Open Access Journal Open Access journal
ISSN (Print) 0354-8996 - ISSN (Online) 2217-7965
Published by U of Kragujevac Homepage  [2 journals]
  • The Influence of Fibre Orientation on Tribological Performance of Jute
           Fibre Reinforced Epoxy Composites Considering Different Mat Orientations

    • Abstract:
      Authors F.Z. Alshammari, K.H. Saleh, B.F. Yousif, A. Alajmi, A. Shalwan, J.G. Alotaibi
      In this study, hand lay-up technique was used to fabricate epoxy composite based on jute fibre mates. Three different orientations wew considered in the fabrication of the composites. The characteristics of the material removal from the surface of the composite due to sliding condition was investigated. Different applied loads were considered to gain different shear force in the interface. Scanning electron microscopy was used to examine the influence of the shear force on the interaction between the fibre and the resin after sliding at different orientations. The outcome would be significantly contributed to the knowledge of composite science and tribology. The main findings of the work was that fibre orientation has very significant influence of the wear and frictional performance of jute fibre reinforced epoxy composites. Sliding distance controls the running in and steady state wear behaviour of the composites especially when the composite was tested in parallel and antiparallel orientations. Wear resistance of the composites found to be better in the antiparallel orientation followed by parallel and then normal. Jute fibres gave very promising results to replace glass fibres for the same composites at the same operating conditions.
      Keywords Epoxy Composite, Jute Fibre, Shear Force, Wear, Frictional Performance

      DOI :10.24874/ti.2018.40.03.01
      PubDate: 15 September 2018 12:00:00 +0
  • Theoretical Investigation of Transient Ultra-Thin Lubricant Film During
           Rapid Deceleration

    • Abstract:
      Authors M.F. Abd Al-Samieh
      A theoretical model using Newton-Raphson technique to study the behavior of ultra-thin film thickness formation subjected to transient speed conditions is presented in this paper. The transient oil film pressure and oil film thickness at various snap shots are shown by the numerical simulation. A comparison of the numerical results with experimental work of Glovnea and Spikes has been described and shows a good agreement for the case of rapid halting from a different speed. In the next stage, the formation of a lubricant film thickness in conjunctions of order of few nanometers has been discussed for the case where a polar lubricant is used as an intervening media between two mating molecularly smooth surfaces. The simulation study showed the significant effects of electrostatic force, Van der Waals' and solvation pressure on the lubrication film thickness formation under transient condition.
      Keywords Ultra-thin films, Transient Elastohydrodynamics Solvation, Van der Waals’ force, Electrostatic

      DOI :10.24874/ti.2018.40.03.02
      PubDate: 15 September 2018 12:00:00 +0
  • Wear Evaluation on Turning Inserts Superficially Modified with Titanium
           Nitride by HIPIMS

    • Abstract:
      Authors J.A. Muñoz Diaz, W. Palomino Marmol, I. González Jaimes, I. Fernández, E.D. V-Niño
      The research aim evaluates the wear resistance of inserts for turning of tungsten carbide (WC), uncoated and coated with titanium nitride through physical vapor deposition (PVD) process by high-power impulse magnetron sputtering (HIPIMS) technique to different concentration of titanium (Ti) and nitrogen (N). The inserts were tested in turning of the grey cast iron of FC300 type at dry finishing conditions. The tips and cutting edges of inserts were analyzed before and later of tests by means of scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDS). The obtained results of inserts wear were analyzed statistically using ANOVA tool, Tukey, and Taylor with the purpose of validating the HIPIMS technique as an alternative process of surface modification of the cutting tools for mechanized of grey cast iron, which material used in the manufacturing of liners and valves seats for gasoline, gas and diesel engines.
      KeywordsTungsten carbide, Cutting tools, Coating, Grey cast iron, Statistical methods

      DOI :10.24874/ti.2018.40.03.03
      PubDate: 15 September 2018 12:00:00 +0
  • Effect of TiO2 Nanoparticles Blended with Lubricating Oil on the
           Tribological Performance of the Journal Bearing

    • Abstract:
      Authors S.R. Suryawanshi, J.T. Pattiwar
      This paper presents the performance analysis for plain and elliptical journal bearing operating with industrial lubricants. Titanium dioxide nanoparticle of size 40 nm is used as a lubricant additive to examine the performance of the bearing. Comparative analysis is carried out for three different lubricants with titanium dioxide (0.5% wt) nanoparticles. Performance of bearing is measured at speeds ranging from 500 r.p.m. to 1000 r.p.m. and at 1000 N load. The study of antiwear and antifriction properties for lubricants is carried out on four ball Tribo-tester for operating conditions specified by ASTM standards. An influence of titanium dioxide as an additive on the performance characteristics of the journal bearing such as pressure distribution, load carrying capacity, attitude angle, power loss, oil flow rate, side leakage, frictional force and temperature rise in a film is examined in this paper. The elliptical journal bearing improves the performance of a system over plain bearing operating with the same lubricant.
      Keywords Plain Journal Bearing, Elliptical Journal Bearing, Titanium dioxide nanoparticles, Coefficient of friction, Wear scar diameter

      DOI :10.24874/ti.2018.40.03.04
      PubDate: 15 September 2018 12:00:00 +0
  • Experimental Study of Frictional Vibrations Under Dry Friction Conditions

    • Abstract:
      Authors G.M. Ismailov, A.E. Tyurin
      The paper discusses issues related to dynamic characteristics of friction. Vibrations are analyzed on “indenter on disk” system using brass and steel samples as an example. “Indenter on disk” system is changed by addition of supplementary degree of freedom, which allows the tangential component of friction to be analyzed. Vibration recording, processing and interpretation technique, which takes into account interaction speed, is specified. The obtained results can be used in control systems of modern mechanisms with allowances made for vibration and alternating impacts. Emerging vibrations were found to occupy a significant spectral range and have visible borders across the entire duration of implementation. The spectrographic presentation method was applied for visualization.
      Keywords Wear, Vibration-based diagnostics, Dynamic range, Dry friction

      DOI :10.24874/ti.2018.40.03.05
      PubDate: 15 September 2018 12:00:00 +0
  • Investigation of Mixture of Vegetable Oil and Synthetic Esters as
           Environmentally Friendly Base Stock for Low-temperature Lubrication

    • Abstract:
      Authors R. Kreivaitis, M. Gumbytė
      Environmental issues are of great importance in all the areas of industry and transport. Usage of environmentally friendly, easily biodegradable lubricants has a benefit, when the oil can get into environment by using total loss lubricants, leakages or some accidents. Due to inherent biodegradability, extremely high viscosity index, lubricity, and low cost various vegetable oils are used to produce environmentally friendly lubricants. However vegetable oils have some drawbacks, in particular narrow temperature range and poor oxidation stability. The aim of current study is to evaluate possibility to improve vegetable oil cold temperature properties by dilution it with synthetic esters. The dilution of rapeseed oil is done up to 30 % by lower viscosity poly alpha olefins. The pure point, low temperature flow behavior and tribological properties of diluents are investigated. The results show significant improvement in pure point temperature and low temperature flow ability. Dilution has negative effect on tribological properties. However the investigated mixtures are compatible with antiwear additives and their tribological properties can be improved.
      Keywords Lubricants, Base stocks, Environmentally friendly, Low temperature, Friction, Wear

      DOI :10.24874/ti.2018.40.03.06
      PubDate: 15 September 2018 12:00:00 +0
  • Simulation of Anti Wear Performance Using a Modified Brugger Test Set Up

    • Abstract:
      Authors J. Sequard-Base, A. Grafl, U. Cihak-Bayr, F. Franek
      Modern hydraulic oils have to fulfill a broad variety of parameters limitations to guarantee a proper system performance throughout a considerable lifetime. A comprehensive test of the liquids nowadays just can be performed by using long term hydraulic pump test set ups, including several different test stages. One of the most critical parameters in hydraulic pump testing is the pump wear indicating the anti-wear performance of the used oil. In this paper the authors focused on the development of a new testing procedure based on a simple standardized Brugger test aiming to achieve similar wear results as in a Parker Denison T6H20C pump test set up. The test conditions of a standard Brugger test are changed by taking a brass cylinder, reducing the normal load to 1 kg, increasing the test duration to 300 seconds, providing a well-defined surface roughness by using a 2,500 x grinding paper and perform 4 repetition tests to obtain a statistical more reliable measurement value. By using the new method it was possible to get a pre selection between pass and fail oils according to the wear properties without the necessity of performing an elaborated pump test. The preselection of hydraulic oils according to their anti-wear properties offers a huge cost saving potential for hydraulic oil developments.
      Keywords Hydraulic oils, Pump test, Brugger test, Anti-wear performance, Oil pre selection

      DOI :10.24874/ti.2018.40.03.07
      PubDate: 15 September 2018 12:00:00 +0
  • Studies on Plasma Sprayed Thermal Barrier Coating with Increase in Coating

    • Abstract:
      Authors H. Nayak, N. Krishnamurthy, R.A. Shailesh
      In this study, the nature of performance test like a bond test, wear test and hot corrosion test and its effects on plasma sprayed Yttria-stabilized zirconia and Al2O3 composite (50:50 compositions) coating on Aluminium 6061 substrate are carried out. The three topcoat thicknesses of 100µm, 200µm, and 300µm are used for the studies. In case of hot corrosion test, the substrates were spread by molten salt (55wt.% V2O5+45wt.%Na2SO4) which is kept in the furnace at 350 °C for 40 hours. The properties changed for the different bond thickness where for 200 µm wear properties become optimal and 300 µm the corrosion test remains optimal. There is an improvement in the bond strength and its optimal value is obtained for 100 µm topcoat thickness. The physics behind all three experiments are explained in this paper.
      Keywords Plasma spray, Thermal barrier coating, Microstructure, Wear, Bond strength, Hot corrosion

      DOI :10.24874/ti.2018.40.03.08
      PubDate: 15 September 2018 12:00:00 +0
  • Thermal Treatment Effect on Tribological and Corrosion Performances of
           13Cr5Ni2Mo Super-Martensitic Stainless Steel

    • Abstract:
      Authors S. Tlili, N.E. Beliardouh, C.E. Ramoul, R. Bahi, O.I. Abdullah, H. Kaleli, M.A. Samad
      Wear behavior of 13Cr5Ni2Mo supermartensitic stainless steel (SMSS) were investigated in air and in argillaceous paste at room temperature. Prior to wear testing, the samples were subjected to two thermal treatments, namely; quenching followed by double tempering. A pin-on-disc test rig was used to conduct the wear test with a tribo-pair consisting of supermartensitic stainless steel sliding against itself. It was observed that the microstructure of the thermally treated samples mainly consisted of tempered martensite and carbides. Wear results showed that oxidative and abrasive wear dominated the wear process of the treated samples in both dry conditions and in argillaceous paste. Additionally corrosion tests were performed in 5.0% NaCl solution via potentiodynamic polarization tests. It was found that the passive film formation provides a good corrosion resistance to the samples.
      Keywords Martensitic Stainless Steel, Thermal Treatments, Wear, Corrosion

      DOI :10.24874/ti.2018.40.03.09
      PubDate: 15 September 2018 12:00:00 +0
  • Influence of Ag Nanoparticles for the Anti-wear and Extreme Pressure
           Properties of the Mineral Oil Based Nano-cutting Fluid

    • Abstract:
      Authors L. Prabu, N. Saravanakumar, G. Rajaram
      The cutting fluids are widely used to reduce the temperature and friction between the tool and work piece in the metal cutting processes. This work investigates the enhancement in the tribological properties of the mineral oil (MO) based cutting fluid with the inclusion of silver nanoparticles. The nano-cutting fluid was prepared by adding various proportions of silver nanoparticles in the mineral oil based cutting fluids. The extreme pressure properties and wear preventive characteristics of the nano-cutting fluid were assessed as per ASTM standard. The wear surfaces were analyzed using scanning electron microscopy and energy- dispersive spectroscopy. The inclusion of silver nanoparticles in the base fluid as additive shows a gradual reduction in the friction and wear. The influence of silver nanoparticles improved the load-wear index of the cutting fluid by 8 % and reduced the wear scar diameter by 13% .With reference to the empirical data, all the concentration of nanoparticles exhibit the improvement in the extreme pressure and anti-wear properties of the nano-cutting fluid. The formation of thin tribofilm containing silver nanoparticles at the wear surface is most likely mechanism behind the improvement in tribological behavior of mineral oil-based nano-cutting fluid.
      Keywords Lubricated wear, Lubricant additives, Wear testing, Cutting fluids, Electron microscopy

      DOI :10.24874/ti.2018.40.03.10
      PubDate: 15 September 2018 12:00:00 +0
  • Biomimetics Design for Tribological Applications

    • Abstract: Author L. Ivanović, A. Vencl, B. Stojanović, B. Marković
      Biomimetics, biomimicry and bionics are synonyms for the scientific discipline of creating new structures inspired by nature. Biomimetics systematically analyses the evolutionary processes of living organisms, their structural relationships, the characteristics of natural materials and it studies how this knowledge can be used to create the optimal products and new sustainable materials. In the past decade, the biomimetics has received an incentive for the development by the technology modernization, and above all, by making it possible to study the micro- and nanolevels of biological structures. On the other hand, the miniaturization of technological devices has increased the need to understand the tribological phenomena on micro- and nanolevel, where is a huge potential for technological innovation. The integration of advanced research methods made it possible to discover new aspects in the structure and properties of biological materials and transfer that knowledge into new concepts or products. State-of-the-art of biomimetics progress is discussed, as well as, its goals and the potential to simultaneously achieve the financial and ecological contribution by realization of bio-inspired concepts. An overview of biomimetic researches is also provided, with special emphasis on the possibility of their tribological applications. The characteristic examples have been presented and those examples show how the structural and mechanical properties of the material were used as the basis for developing new creative solutions to solve the problem of friction in engineering applications.
      Keywords Biomimetics, Bionics, Biomimicry, Tribology, Friction, Nanotechnology

      DOI :10.24874/ti.2018.40.03.11
      PubDate: 15 September 2018 12:00:00 +0
  • Surface Roughness Analysis in High Speed Turning of Ti-6Al-4V Using Coated
           Carbide Inserts: Experimental and Modeling Studies

    • Abstract: Author G. D’Mello, P. Srinivasa Pai, A. Prashanth
      Machining and achieving good surface finish in Ti-6Al-4V is a challenging task. Several factors influence surface finish of which some can be controlled and are mainly the machining parameters and some are considered uncontrolled and happens to be the output of the machining process like tool wear and cutting tool vibrations. Several researchers have made attempts to identify these parameters and study both experimentally and through modeling. This study deals with the experimental correlation between machining parameters namely cutting speed, feed rate, depth of cut and uncontrollable parameters namely tool flank wear and cutting tool vibrations on two surface roughness parameters Ra and Rt, while turning Ti-6Al-4V using coated carbide inserts. Further, in order to study the effect of individual parameters statistically on the responses, a widely used statistical technique namely Response Surface Methodology (RSM) and a new technique, Random Forest Regression (RFR) have been applied to these experimental data to model and predict the values of surface roughness parameters. Results revealed that RFR performed better than RSM. It has been found that tool wear is the most dominant parameter affecting surface roughness parameters followed by feed rate and cutting tool vibrations have a direct correlation with surface roughness parameters.
      Keywords Ti-6AL-4V, Surface Roughness, RSM, RFR, HSM

      DOI :10.24874/ti.2018.40.03.12
      PubDate: 15 September 2018 12:00:00 +0
  • Synthesis, Characterization and Application by HVOF of a WCCoCr/NiCr
           Nanocomposite as Protective Coating Against Erosive Wear

    • Abstract:
      Authors W.C. Giaglianoni, M.A. Cunha, C.P. Bergmann, C. Fragassa, A. Pavlovic
      The scope of this work is to synthetize and characterize a WCCoCr/NiCr nanocomposite evaluating its application as protective coating against erosive wear when applied by High Velocity Oxygen Fuel (HVOF). The composite was formed by carbide of tungsten-cobalt-chrome (WCCoCr) processed by high energy milling and a metallic matrix of nickel-chrome (NiCr). The milled material was added to the NiCr in the fraction of 5%wt. The powders were investigated by X-ray diffraction and and scanning electron microscopy, analysing particle size distribution and surface area. The protective layers were deposited by HVOF and evaluated for their microhardness, microstructure, porosity, and erosive wear. Their microstructure showed lamellar character, with a low level of oxides and porosity between 0.5 % and 1 %. The coating formed by NiCr and WCCoCr milled for 3 hours presented microhardness of 635 HV and erosion rates 50 % smaller than the commercial coating.
      Keywords WCCoCr, NiCr, Nanocomposite, High energy milling, HVOF, Erosive wear

      DOI :10.24874/ti.2018.40.03.13
      PubDate: 15 September 2018 12:00:00 +0
  • Tribological and Electrochemical Properties of AISI D3 Steel Coated with
           Hafnium Carbon Nitride

    • Abstract:
      Authors W. Piedrahita, J.C. Caicedo, W. Aperador
      In this research work, hafnium carbonitride (HfCN) coatings were developed via physical vapor deposition with the aim to determine the electrochemical behavior of the HfCN layers on industrial steel substrates. The HfCN coatings, deposited at various negative bias voltage were characterized by X-ray diffraction (XRD), exhibiting the crystallography orientations corresponding to a mix of HfCN, HfC and HfN phases, while the X-ray photoelectron spectroscopy (XPS) measurements were used to determinate the chemical composition of the carbon nitride coatings. By using electrochemical impedance spectroscopy (EIS) and Tafel curves, it was possible to estimate the electrochemical behavior of the HfCN coatings in a sodium chloride (NaCl) solution. Moreover, scanning electron microscopy (SEM) was performed to analyze morphological and chemical surface changes on the HfCN layer due to the reaction in NaCl/HfCN/steel surface interface. The electrochemical behavior of the HfCN coatings in relation to the uncoated AISI D3 steel showed a reduction of 98 % in corrosion rate, indicating that the applied HfCN coatings may be a promising material for industrial applications.
      Keywords HfCN coatings, Corrosion resistance, Wear resistance, Industrial applications

      DOI :10.24874/ti.2018.40.03.14
      PubDate: 15 September 2018 12:00:00 +0
  • A Comparative Experimental Study on Fault Diagnosis of Rolling Element
           Bearing Using Acoustic Emission and Soft Computing Techniques

    • Abstract:
      Authors C. Ratnam, N.M. Jasmin, V.V. Rao, K.V. Rao
      In engineering processes, Health condition Monitoring (HCM) is a fault-finding task to guarantee consistency of rotating machinery. Rolling Element Bearings (REBs) are the main origin of damage in such equipment. They are the key components used in most of the rotating devices. These faults are mainly caused due to premature failure or improper installation of the machine element. Finding and analysis of defects is very vital in rotating machinery for its optimality. A test-rig was established to analyze the various line defects in REBs under different speeds and load conditions. The Acoustic Emission (AE) signatures responses are obtained and analyzed. Soft computing methods, especially Artificial Neural Network (ANN) and Support Vector Machine (SVM) used to compare with experimental results for fault diagnosis of bearings. The AE statistical features were fed as inputs in ANN and SVM. A comparative experimental study on prediction of seeded defect size is carried out using soft computing methods. This study concludes that these methods can be used for prediction of rolling element bearings seeded faults.
      Keywords Diagnosis, Rolling Element Bearings, Artificial Neural Network, Support Vector Machine

      DOI :10.24874/ti.2018.40.03.15
      PubDate: 15 September 2018 12:00:00 +0
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