Fascicula VIII: Recent submissions
Afișează articolele 21-40 of 160
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Model and Application of the Dispsersional aAnalysis for a Wear Study
(Universitatea "Dunărea de Jos" din Galaţi, 2006)This paper shows a coherent calculation model of the unifactorial dispsersional statistic analysis applied for the experimental data study obtained on samples of different volumes, drawn out from a researched statistical ... -
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 ... -
Optimisation of the Tooth Flank Geometry for Non-Standard Spur gear
(Universitatea "Dunărea de Jos" din Galaţi, 2006)In order to increase the transmissible power level of the plastic spur gears, a non-standard tooth is designed, with a variable geometry along the gear facewidth. The variation of the tooth flank geometry, generated by ... -
Interaction Between Two Unequal Circular Holes Lying in a Sheared Elastic Plane
(Universitatea "Dunărea de Jos" din Galaţi, 2006)The paper presents an analytic solution for the stress states in an elastic plan where two unequal circular holes are lying. At infinity, the elastic plane is sheared. To solve the problem, the authors used bipolar ... -
Singular Points in an Elastic Half-Plane Containing a Circular Hole, Loaded by a Normal Point Force on the Straight Boundary
(Universitatea "Dunărea de Jos" din Galaţi, 2006)These authors published theoretical results upon the stress state induced in an elastic half-plane containing a circular hole by a point force applied on its boundary. The solutions were found in bipolar co-ordinates and ... -
Wear and Irreversible Entropy Generation in Dry Sliding
(Universitatea "Dunărea de Jos" din Galaţi, 2006)This paper examines the relationship between wear and the generation of entropy within the mechanically affected zone, MAZ, of a sliding material. It is postulated that wear is related to irreversible entropy generation ... -
Analysis of Wear Cutting Tools by Complex Powerexponential Function for Finishing Turning of the Hardened Steel 20CRMO5 by Mixed Ceramic Tools
(Universitatea "Dunărea de Jos" din Galaţi, 2006)In this paper it is analised the dependence regression between flank wear tools or wear out of belt width on the back surface VB and cutting time t in the form of complex power-exponential regression equation for turning ... -
Durabilyty of Friction Pairs With Functionality in Abrasive Randomly Particles
(Universitatea "Dunărea de Jos" din Galaţi, 2007)It is shown that the abrasive particles, which penetrate in the convergent joint of friction pairs, can damage the superficial layer of surfaces. The wear caused by individual particle depends on having both a satisfactory ... -
A Comparation of Standardized Methods for Lubrication Failure Determination
(Universitatea "Dunărea de Jos" din Galaţi, 2007)Lubricants are used to prevent wear between moving parts and to resist to high pressure between them. There are standardized testing methods that determinate the wear of the contact pair pieces and the pressure that leads ... -
Neural Networks Based Study of Friction Coefficient Variation in Sliding Bearings
(Universitatea "Dunărea de Jos" din Galaţi, 2007)The paper presents the possibility of using the neural networks approach for the analysis of friction coefficient evolution in case of sliding bearings. Several non-metallic bearing materials are investigated, both with ... -
The Level of Confidence for a Ship Hull Girder
(Universitatea "Dunărea de Jos" din Galaţi, 2007)Structural estimation consists in a set of activities done to certificate security and reliability of an existing ship for its residual service life. Depending on ship’s type and damages, there are alternatively evaluation ... -
Research about Roughness resulted at Steel Turning and the Correlation with Piece Surability
(Universitatea "Dunărea de Jos" din Galaţi, 2007)For achieving this study the background of the research in correlation domain between roughness and piece durability are used. This paper performs a new research direction about the roughness, considered such volumetric ... -
The Resulted Roughness at Turning of some Non-Metallic Materials and Correlation with Durability of Machine Cut Surfaces
(Universitatea "Dunărea de Jos" din Galaţi, 2007)In this paper there are studied the results obtained at graphite and polyvinyl chloride turning. Such pieces are used like loose parts or in subassemblies. The final roughness of such pieces after processing and the influence ... -
On Kerosene Lubrication of Hybrid Ball Bearings
(Universitatea "Dunărea de Jos" din Galaţi, 2007)The hybrid ball bearings with silicon nitride balls are employed in special applications, e.g. high-speed machine tools and aeronautics. The kerosene can be used not only as a fuel for the jet engine, but also as lubricant ... -
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 ... -
Influence of Grease Grade and Working Regime on the Structural Modifications of the Superficial Layers on Roller-Roller Tribosystems
(Universitatea "Dunărea de Jos" din Galaţi, 2007)A X-ray diffractometric method is used for analysing the distributions of the 1-st and 2-nd tension state and dislocation density in the superficial layers, after tests in different working and lubricating conditions, the ... -
Flammability Tests on Hot Surfaces for Industrial Fluids
(Universitatea "Dunărea de Jos" din Galaţi, 2007)Industrial fluids have to be evaluated not only for their performances as load capacity, durability, but also for their potential risk including ignition. Based on a solid documentation the authors point out the significance ... -
Diagniosis of the Technical State of Complex Mechanical Systems
(Universitatea "Dunărea de Jos" din Galaţi, 2007)The paper presents a model for prediction and diagnosis of technical state of complex mechanical systems based on the systems theory. In diagnosis studies is used a model that has only input and output parameters as a ... -
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 ... -
Mechanical Resistance as a Function of Local Properties
(Universitatea "Dunărea de Jos" din Galaţi, 2007)The present study makes an estimation of an automotive engine piston mechanical properties and fatigue life based on some characteristics of metallurgical microstructure. Because it is intended to assess the properties in ...
