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Afișează articolele 911-920 of 1945
Influence of the Sliding Speed on the Elastohydrodynamic Regime
(Universitatea ”Dunărea de Jos” din Galați, 2008)
The study of the elastohydrodynamic (EHD) lubrication regime is characterristic for the heavily loaded gears and can be modeled on a two disk (SAE) rig. It is very important to observe and determine the lubrication regime ...
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 ...
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 ...
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 ...
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, ...
Nitrogen Influence on Indentation Fracture Toughness of Stainless Steel Coatings
(Universitatea ”Dunărea de Jos” din Galați, 2008)
This paper studies some aspects of coatings fracture theory and the possibility of extending Lawn’s equation from Vickers indenter geometry to the Rockwell one. Indentation tests were performed on stainless steel coatings ...
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 ...
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 ...
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 ...
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 ...