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Now showing items 11-20 of 24
Etablissement de L’angle Maximum de Pivotement pour un Rouleau Cylindrique d’un Roulement a Quatre Epaulements de Guidage
(Universitatea ”Dunărea de Jos” din Galați, 2006)
In cylindrical roller bearings subjected to complex radial and axial load, there is always a skew motion of rollers. This parasite motion increases the total friction loss within the bearings, restricting their running ...
A New Trend for Preparating Polymeric Calcium Sulfonates for Metal Working Fluids by Phase Transfer Catalysis. Part I.
(Universitatea ”Dunărea de Jos” din Galați, 2006)
Calcium sulfonates derived from sulfonation of heavy alkylate and aromatic extract were synthesized and reacted with formalin to produce anionic polymer in the presence of phase transfer catalysts (PTC). These catalysis ...
A Preliminary Study on the Dynamics of Triboemission, Work Function and Surface Charging of Ceramics
(Universitatea ”Dunărea de Jos” din Galați, 2006)
This paper discusses the tribological dynamics of electron triboemission and after-contact emission during scratching of ceramics. The origin of such triboemission is still unclear, but the author and colleagues consistently ...
Prediction of Wear of Acetabulum Inserts Due to Multiple Human Routine Activities
(Universitatea ”Dunărea de Jos” din Galați, 2006)
It is difficult to predict the quantitative and qualitative aspects of the wear of the components that allow relative motion due to several factors. First, the prosthetic parts in contact experience a wide spectrum of ...
Ultrasound Action on Strength Properties of Polycrystalline Metals
(Universitatea ”Dunărea de Jos” din Galați, 2006)
The mechanical properties of pure aluminum were investigated by tensile test on the sample with average grain size between 60 and 1000 µ m. The stress strain functions given by the models are fitted to the measured points. ...
Research on Surface Roughness by Laser Cut
(Universitatea ”Dunărea de Jos” din Galați, 2006)
Laser cutting is one of the most industrial applications. Laser cutting with oxygen is used primarily for cutting of mild and low-alloyed steels. Cut surface quality is a very important characteristic of laser cutting that ...
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 ...
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 ...
Upon Radial Fretting of Dissimilar Materials
(Universitatea ”Dunărea de Jos” din Galați, 2006)
The paper presents a state of the art concerning radial fretting for dissimilar bodies and fretting damage. Four simple fretting models are defined in the literature: tangential, radial, rotational and torsional. Only the ...
Failure of a Total Knee Prosthesis Tibial Tray Due to the Fatigue Wear
(Universitatea ”Dunărea de Jos” din Galați, 2006)
Some studies report the failure of a tibial insert of knee prostheses due to the subsurface cracking and delamination wear [1]. The present study starts by analysing retrieved total knee prosthesis revealing the loss of a ...