• Principles and Methodologic Peculiarities in the Research of the Tribosystem with Sliding on Translation Cyclic Movement 

      Poștaru, Gheorghe; Ajder, Vasile; Crudu, Ion; Poștaru, Andrei; Ceban, Victor (Universitatea ”Dunărea de Jos” din Galați, 2009)
      The work presents methodological aspects of behavior research in the cyclical slip tribosystems regarding the dynamics of contact processes. Taking into account the fact that in the contact, processes of various origins ...
    • Experimental Study of Friction Losses in Ball Screws 

      Bălan, Rodica Mihaela; Urzică, Ana (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 

      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 ...
    • On the Effect of Spectral Characteristics of Roughness on Contact Pressure Distribution 

      Crețu, Spiridon; Bălan, Mihaela Rodica; Urzică, Ana (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 ...
    • Statistical Assessment of Surface Quality Using 3D Profilometry Parameters 

      Deleanu, Lorena; Andrei, Gabriel; Ciortan, Sorin; Cantaragiu, Alina; Besnea, Aida; Trufașu, Cătălin; Podaru, Geanina (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 ...
    • Experimental Validation of a New Dispersion Method of Additive Particles into Polymer Matrix Composites 

      Dima, Dumitru; Murărescu, Monica; Andrei, Gabriel (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 ...
    • Influence of Sliding Speed and Average Pressure in Dry Regim Upon Wear of Composite with PA and Micro Glass Spheres 

      Maftei, Laura; Deleanu, Lorena; Andrei, Gabriel (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 ...
    • 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 ...
    • 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 ...
    • Tribological Behaviour of Molybdenum Disulphide Nanoparticles 

      Ilie, Filip; Constantin, Tita (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 ...
    • Friction in the Microtribosystems.Influence of Condensed Water 

      Olaru, Dumitru; Stamate, Ciprian; Dumitrescu, Alina; Ianus, Gelu (Universitatea ”Dunărea de Jos” din Galați, 2009)
      To evaluate the influence of condensed water on the rolling friction in the microtribosystems, the authors used a micro tribometer consisting in a driving rotational disc in contact with 3 microballs which sustain an ...
    • On Viscosity Variation with Temperature of Rapeseed Oil After Different Processing Stages 

      Ștefănescu, Ioan; Șolea, Liviu; Zgherea, Gheorghe; Chiriță, George; Spânu, Constantin (Universitatea ”Dunărea de Jos” din Galați, 2009)
      In recent years, vegetal oils are carefully studied as they may constitute a category of basic raw materials for obtaining organic biodegradable lubricants. Rapeseed oil is seen as an alternative of mineral and synthetic ...
    • A Numerical Solver for the Wheel-Rail Contact Subjected to Combined Loads 

      Crețu, Spiridon; Bărbînță, Constantin-Ioan (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 ...
    • 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, ...
    • Researches on the Presence of Hydrogen During Continuous Casting of Steel 

      Teletin, Claudiu; Crudu, Ion; Spânu, Constantin (Universitatea ”Dunărea de Jos” din Galați, 2009)
      Due to the negative effects that hydrogen has on steels, its content in steels has lately been given special attention. The paper presents the evolution of hydrogen content in steel during the manufacturing and continuous ...
    • Preparation of the Injection Moulded Polymeric Parts to Measure the Residual Stress 

      Niță, Alexandra; Bârsănescu, Paul (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 ...