Căutare Fascicula VIII după Titlu
Afișează articolele 112-131 of 160
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Some Aspects about Driving Wheel/Rail Contact in Steady State Interaction
(Universitatea ”Dunărea de Jos” din Galați, 2008)The driving wheel/rail steady state interaction and the response to harmonic excitation were studied using a complex model for track. The starting point for numerical simulations is the Green matrix of the track. The ... -
Some Experimental Results Concerning the Influence of Surface Coatings on the Wear of Poly-Ether-Etherketone (Peek) Polymeric Gears
(UDJG, 2011)Gears made of general purpose Poly-Ether-Ether-Ketone (PEEK) polymeric material and coated on their flanks with a thin layer of different solid lubricants MoS2, graphite (C), BN and PTFE are tested in relation to wear and ... -
Some Special Features of the Elastic-Plastic Deformation of the Composite Electrolytic Platings
(Universitatea ”Dunărea de Jos” din Galați, 2006)One brings the elastic particularises and figures of the deformation of composition of the iron-nickel and iron hedging’s to the micropression. This information makes it possible to explain the mechanism elastic and plastic ... -
Specific Aspects of the Contact Wheel-Rail and the “IN SITU” Rehabilitation of Tram Rails
(Universitatea "Dunărea de Jos" din Galaţi, 2006)The rails are an important and critical part of a railway system and are exposed, during service, to high stresses of different types, frequency and orientation and also to different environmental. The tram rails are in ... -
Statistical Assessment of Surface Quality Using 3D Profilometry Parameters
(Universitatea ”Dunărea de Jos” din Galați, 2009)he paper presents a statistical analysis for quality assessment of metallic surfaces and coating in order to use the conclusions for improving coating technology. Surface investigation was done with the help of a 3D ... -
Steel on Silicon Nitride Hybrid Tribological Systems Lubricated by Kerosene. Tests on a fFour-Ball Machine
(Universitatea ”Dunărea de Jos” din Galați, 2009)The kerosene can be used not only as a fuel for jet engines, but also as lubricant of the various mechanisms of modern jet aircrafts and turbine helicopters [1]. In order to determine the wear resistance of hybrid ... -
Structure Assessment by X-Ray Difractometry for Ceramic Materials used in Oral Prosthetic Systems
(Universitatea ”Dunărea de Jos” din Galați, 2009)The paper presents a difractometric analysis on two types of ceramics nowadays available on the market and frequently used in restorative dentistry: InLine (IVOCLAR) and Hera-Ceram (HAEREUS KULZER). The diffractograms ... -
Structured Surfaces used for Improving Tribological Behaviour for the Piston – Ring Cylinder – Liner Friction Couples in Internal Combustion Engines
(Universitatea "Dunărea de Jos" din Galaţi, 2007)Structured surfaces means the achievement of a rate, or controlled micro-geometry for one or both friction surfaces. These surface profiles are used to guarantee lubrication functions of transport, hoarding and spread of ... -
Studies Regarding the Influence of Carbon Content on the Tribological Behaviour of Gas-Carbu-Sintering Steels
(UDJG, 2011)The paper presents the experimental research on the tribological behavior of sintered steels obtained by carburizing the iron powder with different concentrations of graphite (Gr). For the experimental research were prepared ... -
Study of Wear Evolution for a Hydraulic Oil Using a Four Ball Tester
(Universitatea ”Dunărea de Jos” din Galați, 2008)Time is crucial for the wear of materials. Time of an experiment must be long enough to obtain an observable wear but no so long to make the experiments expensive. For determining anti-wear properties of the hydraulic oils ... -
A Study on the Prediction of Stability Behaviour for Flexible Rotor in Journal Bearings
(Universitatea "Dunărea de Jos" din Galaţi, 2007)The influence of the labyrinth seals on the dynamic behaviour of a flexible rotor in journal bearings is investigated. In particular a code which makes possible the determination of the stiffness and damping coefficients ... -
Surface Roughness Parameters Evaluation in Rolling/Sliding Wear TestsS
(UDJG, 2011)Rolling/sliding wear tests were performed on an Amsler test rig. Normal load (expressed as the Hertzian pressure) and the roll-slide ratio have been considered to have the most important influence in simulating gear ... -
Surface Roughness Parameters Evolution Under Fatigue Loading
(UDJG, 2010)The main objective of this paper is to demonstrate that in order to have a complete characterisation of fatigue degradation it is necessary to analyze the evolution of surfaces roughness, which can become a stress ... -
Technological Providing of Surface Layer Wear Resistance of Machine Components
(UDJG, 2011)The article describes the problem of assuring the wear resistance of the friction surface layers based on the control of the geometrical, physical and mechanical properties to be formed after the machining process. -
Test-Rig for Pressure Measurements in an Aerostatic Bearing
(Universitatea ”Dunărea de Jos” din Galați, 2008)The paper presents a test rig for local pressure investigation in an aerostatic or gasostatic bearing system. Using a simple and performant computer assisted measurement device, pressure evolution in lubrication area can ... -
The Application of CRN Coating in Sliding Pairs under Lubrication Conditions
(UDJG, 2011)This work revealed the results of the impact of the formed surface layer CrN and the surfaces layer CrN-steel 46Cr2 “ring” structure. The sliding pairs worked under conditions of lubricating the friction area with Lotos ... -
The Behaviour of Two Non-Conventionally Treated Steels During Corrosion Process
(Universitatea ”Dunărea de Jos” din Galați, 2009)This paper presents an analysis on two steel grades, subjected to nitriding thermo-chemical treatment after classic / thermo-magnetic treatments (in direct current/alternative current). It was estimated the durability of ... -
The Dynamic Behavoir of the Sliding Tribosystem in Cyclical Translation Motion in Unsteady Duty
(UDJG, 2011)The present paper deals with certain methodological aspects of researching the behaviour of the sliding tribosystem in cyclical translation motion from the point of view of the dynamics of contact processes. The dynamic ... -
The Effect of Wiberg Angle on the Contact Pressure Pistribution in Natural and Artficial Joint
(Universitatea ”Dunărea de Jos” din Galați, 2008)The analogies and differences between the mechanical joints and the biological ones, in the presence of relative motion, are based on the pressure distribution. The paper analysed a numerical model of the pressure distribution ... -
The External Cylindrical Surface Rolling by Method of Cold Deformation
(Universitatea ”Dunărea de Jos” din Galați, 2006)This report, by the shown methodology, tries to contribute to the effective solution of tasks in the field of studying and designing the processes and states. It also points out a possible way of achieving high techno-economical ...
