Căutare 2009 fascicula8 nr2 după Titlu

Afișează articolele 1-19 of 19

    • 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 ...

    • 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 ...

    • Diffractometry Analysis on Non-Conventional Treated Steels after Tribological Tests 

      Papadatu, Carmen-Penelopi; Gheorghieș, Constantin; Ștefănescu, Ioan (Universitatea ”Dunărea de Jos” din Galați, 2009)
      Two steel grades were subjected to a nitro-carburized thermo-chemical treatment after thermo-magnetic treatments. The contact was studied employing the concept of tribosystem and tribomodel. The structural aspects into ...

    • Estimation of the Operability Index of a Containership Operating in the Black Sea 

      Rusu, Liliana; Bernardino, Mariana (Universitatea ”Dunărea de Jos” din Galați, 2009)
      The calculation of the operability index, which represents the percentage of time during which the ship is operational, depends on the wave climate of the ocean area where the ship operates, the dynamic response of the ...

    • Fabric Reinforced Filled Epoxy Composites 

      Bria, Vasile; Cîrciumaru, Adrian; Bîrsan, Iulian-Gabriel; Ungureanu, Victor (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, ...

    • A Fast Numerical Method to Predict Elastic Fields Due to Eigenstrains in an Isotropic Half-Space PartII. Program Validation and Simulations 

      Spânu, Sergiu; Dearn, Emanuel (Universitatea ”Dunărea de Jos” din Galați, 2009)
      A fast algorithm to solve the inclusion problem for arbitrarily shaped eigenstrains is validated in this paper. Influence coefficients formulas and numerical predictions for elastic fields due to a spherical region of ...

    • A Fast Numerical Method to Predict Elastic Fields due to Eigenstrains in an Isotropic Half-Space Part I: Algorithm Overview 

      Spânu, Sergiu; Diaconescu, Emanuel (Universitatea ”Dunărea de Jos” din Galați, 2009)
      A fast algorithm to predict elastic fields due to arbitrarily shaped eigenstrains in an elastic, isotropic half-space is advanced in this paper. The inclusion domain is partitioned in a set of cuboids of uniform eigenstrains, ...

    • Fatigue Sensitivity Analysis of a Ship Structural Detail 

      Chirică, Ionel; Giuglea, Ștefan; Beznea, Elena-Felicia (Universitatea ”Dunărea de Jos” din Galați, 2009)
      In the paper, a FEM analysis used for fatigue assessment, based on the rules, was done. The approach for fatigue assessment in the early design stage of the ship structure has been developed. To overcome the challenges due ...

    • Measuring the Residual Stress of the Injection Moulded Polymeric Parts 

      Niță, Alexandra; Leițoiu, Bogdan; Goanță, Viorel; Bârsănescu, Paul (Universitatea ”Dunărea de Jos” din Galați, 2009)
      The residual stresses are usually introduced during manufacturing, and are caused by processes such as molding. This paper presents how the authors determine the residual stresses for the flat plates from ABS, PP and PS ...

    • Particularities of Rubber Lip Seals Used for Pneumatic Linear Drives 

      Podaru, Geanina; Ciortan, Sorin; Bîrsan, Iulian; Deleanu, Lorena (Universitatea ”Dunărea de Jos” din Galați, 2009)
      The paper presents some particular aspects of reciprocating rubber lip seals for pneumatic linear drives. This study is focused on the following tribological aspects: friction variation under linear velocity, determination ...

    • Preliminary Results on the use of Palm Oil and Shea Butter in Lubrication Process in Food Industry 

      Bike Mbah, Jean Baptiste; Kamga, Richard; Gheorghieș, Constantin; Praisler, Mirela (Universitatea ”Dunărea de Jos” din Galați, 2009)
      In this study, vegetal oils (palm oil and shea butter) are analyzed for their uses in lubrication of mechanical part of machines in food industry. These vegetal oils were analyzed by X-ray diffraction and transmission ...

    • Rapeseed Oil Flammability on Hot Surface 

      Deleanu, Lorena; Ciocan, Sorin; Șolea, Liviu (Universitatea ”Dunărea de Jos” din Galați, 2009)
      The paper presents the tests and results upon rapeseed oil flammability on hot surface. The oil samples were obtained from a rapeseed oil after a dewaxing process. There were established temperature ranges for which the ...

    • Sliding Indentation Behaviour of x 65 Hydrogenated Steel Grade 

      Spânu, Constantin; Teletin, Claudiu; Crudu, Ion; Mereuță, Valentin (Universitatea ”Dunărea de Jos” din Galați, 2009)
      The paper presents an experimental research on non-hydrogenated and hydrogenated X 65 steel samples. The steel was obtained from a continuous casting slab, this grade being used in petroleum industry. The hydrogen has an ...

    • Steel on Silicon Nitride Hybrid Tribological Systems Lubricated by Kerosene. Tests on a fFour-Ball Machine 

      Paleu, Viorel (Universitatea ”Dunărea de Jos” din Galați, 2009)
      The kerosene can be used not only as a fuel for jet engines, but also as lubricant of the various mechanisms of modern jet aircrafts and turbine helicopters [1]. In order to determine the wear resistance of hybrid ...

    • Structure Assessment by X-Ray Difractometry for Ceramic Materials used in Oral Prosthetic Systems 

      Ursache, Maria; Armencia, Oana (Universitatea ”Dunărea de Jos” din Galați, 2009)
      The paper presents a difractometric analysis on two types of ceramics nowadays available on the market and frequently used in restorative dentistry: InLine (IVOCLAR) and Hera-Ceram (HAEREUS KULZER). The diffractograms ...

    • The Behaviour of Two Non-Conventionally Treated Steels During Corrosion Process 

      Papadatu, Carmen-Penelopi (Universitatea ”Dunărea de Jos” din Galați, 2009)
      This paper presents an analysis on two steel grades, subjected to nitriding thermo-chemical treatment after classic / thermo-magnetic treatments (in direct current/alternative current). It was estimated the durability of ...

    • Torsional Analysis of Ship Hull Model 

      Chirică, Raluca; Mușat, Sorin Dumitru; Boazu, Doina; Beznea, Elena-Felicia (Universitatea ”Dunărea de Jos” din Galați, 2009)
      In this paper a new methodology (numerical and experimental) proposed to analyze the ship hull torsion is treated. The torsion analysis is performed on a scale model (1:50) of a container ship, made of composite material. ...

    • Tribological Characteristics and Formation of Subsurface Structures of Cast FE-CR-C Alloys with Different Content of Copper, under Sliding Friction 

      Novytskyy, Viktor; Lakhnenko, Volodymyr (Universitatea ”Dunărea de Jos” din Galați, 2009)
      Effect of copper contents (0%, 0.4%, and 14%) and modes of heat treatment on initial structure of Fe-Cr-C alloys (C~1.2%, Cr = 17…19%) and subsurface structure of friction layers and tribological characteristics of these ...

    • Tribological Testing Programs for Uhmwpe Matrix Composites 

      Chiculiță, Simona; Rîpă, Minodora; Andrei, Gabriel (Universitatea ”Dunărea de Jos” din Galați, 2009)
      This paper aims to review the knowledge on materials and tribology of the ultra high molecular weight polyethylene (UHMWPE) composites. The various mechanisms proposed for the wear behaviour of UHMWPE are closely associated ...