Căutare Fascicula VIII după Titlu
Afișează articolele 124-143 of 160
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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 ... -
The Influence of Biodiesel Fuels on Lubricity of Passenger Car Diesel Engine Oils
(UDJG, 2010)The present paper mainly focuses on the physical and chemical impact of currently used and future biodiesel components on the performance of a typical low-sulphated-ash-phosphorus-sulphur (low SAPS) passenger car engine ... -
The Influence of Nano-Particle Additive to Lubricating Oils on the Structure and Properties of Friction Surfaces
(UDJG, 2011)The article considers the influence of the additive in the lubricating oils Cermet, on tribological properties of a friction pair «cast iron – chrome», which is typical for the cylinder-piston unit of engines. It is shown ... -
The Influence of the Applied Load on the Friction Coefficient of the Sintered Iron-Base Bearings
(Universitatea ”Dunărea de Jos” din Galați, 2008)In the recent years the iron base sintered bearings production was considerable increased at the expense of the copper based ones, due to the low cost and availability of the iron powders as well as the higher strength. ... -
The Influence of the Sintering Atmospheres on the Wear Behaviour of the Copper Based Alloys
(UDJG, 2010)The Powder Metallurgy (PM) technique allows manufacturing the sintered selflubricating materials having a high wear resistance. It is well known that the small and medium sized bearings are processed by PM with better ... -
The Influence of the Thermomagnetic Treatments on the Nitrided Superficial Layers Evolution after Wear Process (III)
(UDJG, 2011)Two types of steel grades were subjected to a nitriding thermo-chemical treatment after the thermo-magnetic treatments. The structural aspects of the superficial layers of these steels are studied after the friction process ... -
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 ... -
The Neuber’s Rule and a Correlation Between Fretting Fatigue and Plain Fatigue
(UDJG, 2010)Based on these experimental observations and on the remark that any small change on the discontinuity geometry has a significant effect on the stress distribution around it, a stress concentration factor is mandatory to ... -
The Presence of Hydrogen as Wear Environment for the Mechanical System of the Continuous Casting Equipment
(UDJG, 2010)In the last years the continuous casting of the steel has a tremendous development. In the same time, the casting steel quality requirements become higher. The hydrogen as environment of the casting diminishes the steel ... -
The Reliability of the Rlac Bore-Hole Pumps
(UDJG, 2010)The paper aims to present a study concerning the determination of the borehole pumps operating reliability. The considered bore-hole pump for this study is RLAC 2 7/8 x 1¾ in x 32c type and it equips the oil-wells of ... -
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 ... -
The Screw Fastening Order in Slewing Rings
(UDJG, 2011)The slewing rings are composed of two rings, an inner one and an outer one, in which raceways are obtained that, contains the rolling elements on which the working loads are transmitted from the moving ring to the fixed ... -
The Tool to Model through Micro Strain and Micro Cutting
(Universitatea ”Dunărea de Jos” din Galați, 2008)The cutter wear is analised by a single hard fixed particle (inclusion) in brittle material. The shakedown pressure of the inclusion contact is directly proportional to shear field stress of the cutter surface and is ...