Fascicula VIII: Recent submissions
Afișează articolele 101-120 of 160
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Preparation of the Injection Moulded Polymeric Parts to Measure the Residual Stress
(Universitatea ”Dunărea de Jos” din Galați, 2009)Polymeric materials are nowadays widely employed as much for the manufacturing of a lot of daily objects as in the high-tech sector. These materials are well known for the extremely complex behavior strongly depending on ... -
Influence of Sliding Speed and Average Pressure in Dry Regim Upon Wear of Composite with PA and Micro Glass Spheres
(Universitatea ”Dunărea de Jos” din Galați, 2009)The papers presents the wear results of testing a set of composites PA + 1% black carbon + x% micro glass spheres, where x is the micro glass sphere concentration (x=0, 5, 10, 20, 30wt) using a pin-on-disc tribotester, for ... -
Tribological Behaviour of Molybdenum Disulphide Nanoparticles
(Universitatea ”Dunărea de Jos” din Galați, 2009)l dichalcogenides, are well known for their solid lubricating behaviour. Thin films of MoS2 exhibit extremely low coefficient of friction in dry environments, and are typically applied by mixing in oil, grease or impregnated ... -
Characterization of Materials Surface by X-Ray Reflectivity Measurements
(Universitatea ”Dunărea de Jos” din Galați, 2009)The mechanical or physical properties of surface determine a certain behaviour of material in various working conditions. For example, the roughness of surface influences the value of friction coefficient. X-ray reflectivity ... -
Experimental Validation of a New Dispersion Method of Additive Particles into Polymer Matrix Composites
(Universitatea ”Dunărea de Jos” din Galați, 2009)The general expected properties of the composite materials are the result of the efficient reinforcement distribution of nanometric particles, one of the most important methods considers their dispersion. The aim of this ... -
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 ... -
A Numerical Solver for the Wheel-Rail Contact Subjected to Combined Loads
(Universitatea ”Dunărea de Jos” din Galați, 2009)A working algorithm, able to be incorporated into a computer code, has been developed to solve the stress state in the general case of non-Hertzian contacts. Brent’s method has been involved to find the contact point for ... -
On the Effect of Spectral Characteristics of Roughness on Contact Pressure Distribution
(Universitatea ”Dunărea de Jos” din Galați, 2009)In the first part of the paper, the matrix containing the roughness heights is obtained by a linear transformation of the Gaussian input matrix, the coefficients of the transformation matrix being found as solutions of a ... -
An Analytical Procedure to Incorporate the Bauchinger Effect on Fretting Fatigue Models
(Universitatea ”Dunărea de Jos” din Galați, 2009)This paper proposes a modification on SWT model concerning the prediction on fretting fatigue life, in order to take into account the material deviation from the ideal elastic-plastic behaviour, the so-called “Bauschinger ... -
Characterisation of Particulate 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, ... -
Experimental Study of Friction Losses in Ball Screws
(Universitatea ”Dunărea de Jos” din Galați, 2009)In contrast with conventional sliding lead screws, ball screws with rolling friction between the screw and nut have high efficiency, accurate positioning and smooth, quiet operation at low friction that make this kind of ... -
Damage Prediction in Fatigue Corrosion Processes
(Universitatea ”Dunărea de Jos” din Galați, 2009)The paper aims to establish an algorithm for determining the values and evolution of the stress concentration factor in corrosive environment, and establish its influence on the fatigue strength of steel required in a ... -
Multipurpose Ecological Lubricating Greases
(UDJG, 2010)Lubricants facilitate the effective operation of mechanical equipment, reducing friction and wear, but, in the same time, they are a large and diffuse pollution source, both on soil and in water. Eliminating or reducing ... -
Research Issues on Punch - Circular Plate Elastic Contacts
(UDJG, 2010)Circular plates enter into the category of finite dimension bodies. Solutions regarding the displacements and stresses, which appear at the contact involving finite dimension bodies and also numerical and analytical results ... -
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 ... -
Numerical Modelling of 3D Impact
(UDJG, 2010)The paper presents a virtual device designed for studying tri-dimensional impact. The main goal of the work is to present a solution for finding the coefficient of restitution for the tri-dimensional case of a sphere ... -
Characteristics of Material in Zone of Cut by Laser Cutting
(UDJG, 2010)The laser cutting is a cost effective technology. This process is based on melting and evaporating material in very small, a well-defined area and a blownout of the cut by the assist gas. Laser cutting processes make heat ... -
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 ... -
Multiwall Carbon Nanotubes Coated with Iron (iii) Oxide and Improved Dispersion Method for Nanostructured Polymer Composites
(UDJG, 2010)The aim of this paper is to describe a method of coating with ceramic molecular layer, in order to obtain a MWCNTs (multiwall carbon nanotubes) functionalized surface, chemical bond energy increase and physico-chemical ... -
Upon Fretting Behaviour in a Hertzian Point Contact
(UDJG, 2010)Fretting is known as a wear process occurring in a small amplitude cyclic motion of two solid contacting surfaces and it can affect the fatigue resistance of the material, inducing wear and cracking. The kinematics ...
