Now showing items 1-20 of 158

    • An Analytical Procedure to Incorporate the Bauchinger Effect on Fretting Fatigue Models 

      Buciumeanu, Mihaela; Palaghian, Liviu; Sousa Miranda, António; Silva, Filipe Samuel (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 ...
    • Analysis of Gear Quality Criteria and Performance of Curved Face width Spur Gears 

      Andrei, Laurentia; Andrei, Gabriel; Walton, Douglas; Dearn, Karl (Universitatea ”Dunărea de Jos” din Galați, 2008)
      For plastic gears, developments in composites and tooth geometry are essential for their selection in power transmissions. In order to enhance the transmissible power level of the plastic spur gears, an arc-shaped tooth ...
    • Analysis of the PM Bearing – Spindle Contact Using Finite Element Method 

      Teișanu, Cristina; Dumitru, Nicolae; Gheorghe, Ștefan (UDJG, 2011)
      Using PM (Powder Metallurgy) technologies, new antifriction materials based on iron-copper powders with different addition elements were developed. The elemental powder mixtures were compacted at different pressures and ...
    • Analysis of Wear Cutting Tools by Complex Powere-xponential Function for Finishing Turning of the Hardened Steel 20CRMO5 by Mixed Ceramic Tools 

      Dašić, Predrag (Universitatea ”Dunărea de Jos” din Galați, 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 ...
    • Analysis of Wear Cutting Tools by Complex Powerexponential Function for Finishing Turning of the Hardened Steel 20CRMO5 by Mixed Ceramic Tools 

      Dašić, Predrag (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 ...
    • Aspects Concerning Contact Stresses from a Dental Articulator Joint 

      Ciornei, Florina; Alaci, Stelian; Muscă, Ilie; Frunză, Gheorghe; Irimescu, Luminița; Cerlincă, Delia (UDJG, 2010)
      A dental articulator is a mechanical device, which simulates the temporomandibular joint (TMJ). The articulator is important because it replicates the basic revolve action of the upper and lower mandibles, as well as ...
    • Aspects of Rheological Behavior of Rapeseed Oil 

      Șolea, Liviu; Ștefănescu, Ioan; Chiriță, George (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 ...
    • Behaviour of a Hydrodynamic Journal Bearing: Torque Measurement During Start-Up 

      Bouyer, Jean; Fillon, Michel (Universitatea ”Dunărea de Jos” din Galați, 2008)
      The start-up friction coefficient in hydrodynamic bearings, used by engineers in the design of bearings, is most often issued from an approximation. Several studies can be found in the literature on this topic but most of ...
    • Bending of Thin Walled Pipes Using the Heat Realised by Friction 

      Tadic, Branko; Marjanovic, Nenad; Nedic, Bogdan (Universitatea ”Dunărea de Jos” din Galați, 2006)
      This paper considers appliance of heat generated by friction to relieve deformation of light metals, having as example of bending thin walled copper pipes. Based on numerous, primarily experiment analysis the conclusions ...
    • Characterisation of Particulate Epoxy Composites 

      Bîrsan, Iulian-Gabriel; Bria, Vasile; Cîrciumaru, Adrian; Roman, Igor (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, ...
    • Characteristics of Material in Zone of Cut by Laser Cutting 

      Radovanovic, Miroslav (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 ...
    • Characterization of Materials Surface by X-Ray Reflectivity Measurements 

      Gheorghieș, Constantin; Gheorghieș, Livia; Atanasiu, Valeriu (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 ...
    • Characterizing the Wear Particles of Intervertebral Disc Prosthesis and their Biological Response 

      Crețan Stamate, Monica; Gafițanu, Mihai; Stamate, Ciprian (Universitatea ”Dunărea de Jos” din Galați, 2008)
      Prosthetic debris is the leading factor causing prosthetic loosening and requiring revision surgery. Wear debris is formed over time with any prosthesis. Factors determining disc arthroplasty survivability are similar to ...
    • Clay/Epoxy Composites 

      Cîrciumaru, Adrian; Bîrsan, Iulian-Gabriel; Bria, Vasile; Postolache, Ion (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 ...
    • A Comparation of Standardized Methods for Lubrication Failure Determination 

      Spânu, Constantin; Rîpă, Minodora; Ştefănescu, Ioan; Deleanu, Lorena (Universitatea "Dunărea de Jos" din Galaţi, 2007)
      Lubricants are used to prevent wear between moving parts and to resist to high pressure between them. There are standardized testing methods that determinate the wear of the contact pair pieces and the pressure that leads ...
    • Contact Model for a Rough Surface 

      Cănănău, Sorin (Universitatea ”Dunărea de Jos” din Galați, 2008)
      The paper presents a model for the determination of the contact characteristics, pressure distribution and subsurface stress field at the contact cylinder- plane. The first part of the paper presents the geometrical models ...
    • Criterion of Transition in the Fretting Phenomenon Based on the Variabile Coefficient of Friction 

      Ghimiși, Ștefan Sorinel (Universitatea ”Dunărea de Jos” din Galați, 2006)
      Fretting is now fully identified as a small amplitude oscillatory motion which induces a harmonic tangential force between two surfaces in contact. It is related to three main processes, i.e. fretting-wear, fretting-fatigue ...
    • Damage Evolution of AL7175 and CK45 Alloys under Fretting Fatigue 

      Buciumeanu, Mihaela; Miranda, Antonio Sousa; Silva, Filipe Samuel (Universitatea "Dunărea de Jos" din Galaţi, 2007)
      There are several different parameters that affect the fretting fatigue behaviour of materials. The present work is focused on the influence of the wear damage evolution. Results of fretting fatigue experimental tests ...
    • Damage Prediction in Fatigue Corrosion Processes 

      Băicean, Svetlana; Palaghian, Liviu; Buciumeanu, Mihaela; Mereuță, Valentin (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 ...
    • Diagniosis of the Technical State of Complex Mechanical Systems 

      Crudu, Ion; Spânu, Constantin; Rîpă, Minodora; Teletin, Claudiu (Universitatea "Dunărea de Jos" din Galaţi, 2007)
      The paper presents a model for prediction and diagnosis of technical state of complex mechanical systems based on the systems theory. In diagnosis studies is used a model that has only input and output parameters as a ...