Scientific papers - Annals of "Dunarea de Jos" University of Galati - Analele științifice ale Universității "Dunărea de Jos" din Galați: Recent submissions
Afișează articolele 921-940 of 1845
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Treating Propriety Through Cutting of Metals and Alloys in Cryogenic Condition
(Universitatea "Dunărea de Jos" din Galați, 2003)It is known that a base function of cutting environments is to cool the cutting tools, the tooled area and the material that is removed under the shape of chip. But it is also known that beginning with the increase of ... -
A Study Upon Traction Systems for Technological Machines with Auto Propulsion
(Universitatea "Dunărea de Jos" din Galați, 2003)This paperwork presents a comparison of traction systems used for heavy machines that needs to move on public roads. (construction devices, agriculture machines, etc.). Here are presented traction charts implemented on ... -
The Character of the Dynamic Processes in the Proportional Servodriving Systems of the Hydraulic Pumps Capacity
(Universitatea "Dunărea de Jos" din Galați, 2003)The proportional servodriving systems of hydraulics pump capacity are used in many more applications in tehnological equipments driving. Thus, the construction of specialized pumping hydraulics units, like the A10VG and ... -
About Dynamic Stability Analysis of the Power Regulators With Exactly Hyperbolic Characteristic
(Universitatea "Dunărea de Jos" din Galați, 2003)Power regulators are attached devices of hydraulic pumps with variable capacity. Theses have the means to modify the pump capacity depending of the pressure from the circuit served by the pump. In this way, it result ... -
Dynamic of Industrial Tractors with THM for Construction
(Universitatea "Dunărea de Jos" din Galaţi, 2003)Traction calculus is done to determine the main parameters of the equipment’ s engine and transmission designed to achieve the performances imposed in exploitation [1, 2, 3]. One of the base problem of the traction ... -
Friction Coupling and Specific Phenomena
(Universitatea "Dunarea de Jos" din Galați, 2003)The present work object is to make the transitory conditions evolution evident,in coupling, by considering the friction moment which depends on angular speed. The friction moment is considered to be dependent on the relative ... -
Aspects of Rheological Behavior of Rapeseed Oil
(Universitatea ”Dunărea de Jos” din Galați, 2009)This paper presents a study of dynamic viscosity variation with shear rate for rapeseed oils obtained from different stages of processing and the hydraulic oil grade H32. For each of the 6 types of oils studied was determined ... -
Estimation of the Operability Index of a Containership Operating in the Black Sea
(Universitatea ”Dunărea de Jos” din Galați, 2009)The calculation of the operability index, which represents the percentage of time during which the ship is operational, depends on the wave climate of the ocean area where the ship operates, the dynamic response of the ... -
Particularities of Rubber Lip Seals Used for Pneumatic Linear Drives
(Universitatea ”Dunărea de Jos” din Galați, 2009)The paper presents some particular aspects of reciprocating rubber lip seals for pneumatic linear drives. This study is focused on the following tribological aspects: friction variation under linear velocity, determination ... -
Diffractometry Analysis on Non-Conventional Treated Steels after Tribological Tests
(Universitatea ”Dunărea de Jos” din Galați, 2009)Two steel grades were subjected to a nitro-carburized thermo-chemical treatment after thermo-magnetic treatments. The contact was studied employing the concept of tribosystem and tribomodel. The structural aspects into ... -
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 ... -
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 ... -
Tribological Characteristics and Formation of Subsurface Structures of Cast FE-CR-C Alloys with Different Content of Copper, under Sliding Friction
(Universitatea ”Dunărea de Jos” din Galați, 2009)Effect of copper contents (0%, 0.4%, and 14%) and modes of heat treatment on initial structure of Fe-Cr-C alloys (C~1.2%, Cr = 17…19%) and subsurface structure of friction layers and tribological characteristics of these ... -
Measuring the Residual Stress of the Injection Moulded Polymeric Parts
(Universitatea ”Dunărea de Jos” din Galați, 2009)The residual stresses are usually introduced during manufacturing, and are caused by processes such as molding. This paper presents how the authors determine the residual stresses for the flat plates from ABS, PP and PS ... -
Rapeseed Oil Flammability on Hot Surface
(Universitatea ”Dunărea de Jos” din Galați, 2009)The paper presents the tests and results upon rapeseed oil flammability on hot surface. The oil samples were obtained from a rapeseed oil after a dewaxing process. There were established temperature ranges for which the ... -
Clay/Epoxy Composites
(Universitatea ”Dunărea de Jos” din Galați, 2009)Fillers are generally used to decrease the costs of a composite material but they are changing also some of composite’s properties due to their physical properties, their dimensions and their shapes. Filled polymer could ... -
Torsional Analysis of Ship Hull Model
(Universitatea ”Dunărea de Jos” din Galați, 2009)In this paper a new methodology (numerical and experimental) proposed to analyze the ship hull torsion is treated. The torsion analysis is performed on a scale model (1:50) of a container ship, made of composite material. ... -
Fatigue Sensitivity Analysis of a Ship Structural Detail
(Universitatea ”Dunărea de Jos” din Galați, 2009)In the paper, a FEM analysis used for fatigue assessment, based on the rules, was done. The approach for fatigue assessment in the early design stage of the ship structure has been developed. To overcome the challenges due ... -
Tribological Testing Programs for Uhmwpe Matrix Composites
(Universitatea ”Dunărea de Jos” din Galați, 2009)This paper aims to review the knowledge on materials and tribology of the ultra high molecular weight polyethylene (UHMWPE) composites. The various mechanisms proposed for the wear behaviour of UHMWPE are closely associated ... -
Fabric Reinforced Filled Epoxy Composites
(Universitatea ”Dunărea de Jos” din Galați, 2009)Among composites, the polymer matrix ones are the cheapest and the easiest to form but they show major disadvantages such as poor electrical and thermal conductivity, low fire resistance etc. In the case of any composite, ...
