Căutare Fascicula VIII după Titlu

Afișează articolele 136-155 of 160

    • The Influence of the Thermomagnetic Treatments on the Nitrided Superficial Layers Evolution after Wear Process (III) 

      Papadatu, Carmen-Penelopi (UDJG, 2011)
      Two types of steel grades were subjected to a nitriding thermo-chemical treatment after the thermo-magnetic treatments. The structural aspects of the superficial layers of these steels are studied after the friction process ...

    • The Level of Confidence for a Ship Hull Girder 

      Popoiu Păcuraru, Sandiţa; Matulea, Iordan (Universitatea "Dunărea de Jos" din Galaţi, 2007)
      Structural estimation consists in a set of activities done to certificate security and reliability of an existing ship for its residual service life. Depending on ship’s type and damages, there are alternatively evaluation ...

    • The Neuber’s Rule and a Correlation Between Fretting Fatigue and Plain Fatigue 

      Buciumeanu, Mihaela; Palaghian, Liviu (UDJG, 2010)
      Based on these experimental observations and on the remark that any small change on the discontinuity geometry has a significant effect on the stress distribution around it, a stress concentration factor is mandatory to ...

    • The Presence of Hydrogen as Wear Environment for the Mechanical System of the Continuous Casting Equipment 

      Teletin, Claudiu; Spânu, Constantin; Crudu, Ion (UDJG, 2010)
      In the last years the continuous casting of the steel has a tremendous development. In the same time, the casting steel quality requirements become higher. The hydrogen as environment of the casting diminishes the steel ...

    • The Reliability of the Rlac Bore-Hole Pumps 

      Drumeanu, Adrian Cătălin; Antonescu, Niculae Napoleon (UDJG, 2010)
      The paper aims to present a study concerning the determination of the borehole pumps operating reliability. The considered bore-hole pump for this study is RLAC 2 7/8 x 1¾ in x 32c type and it equips the oil-wells of ...

    • The Resulted Roughness at Turning of some Non-Metallic Materials and Correlation with Durability of Machine Cut Surfaces 

      Pascu, Ileana Cristina; Popescu, Iulian (Universitatea "Dunărea de Jos" din Galaţi, 2007)
      In this paper there are studied the results obtained at graphite and polyvinyl chloride turning. Such pieces are used like loose parts or in subassemblies. The final roughness of such pieces after processing and the influence ...

    • The Screw Fastening Order in Slewing Rings 

      Rezmires, Daniel; Monfardini, Alfredo; Racocea, Cezar (UDJG, 2011)
      The slewing rings are composed of two rings, an inner one and an outer one, in which raceways are obtained that, contains the rolling elements on which the working loads are transmitted from the moving ring to the fixed ...

    • The Tool to Model through Micro Strain and Micro Cutting 

      Tache, Antonio; Tache, Carmen (Universitatea ”Dunărea de Jos” din Galați, 2008)
      The cutter wear is analised by a single hard fixed particle (inclusion) in brittle material. The shakedown pressure of the inclusion contact is directly proportional to shear field stress of the cutter surface and is ...

    • Theoretical Evaluation and Experimental Measuring of the Friction Forces from the Sealing of the Rod for the Hydraulic Cylinders 

      Cristescu, Corneliu; Drumea, Petrin; Dumitrescu, Catalin (UDJG, 2011)
      The paper presents some technical problems specific to the mobile sealing, used in the construction of hydraulic cylinders, and the theoretical and experimental methods which allow to determine the friction forces which ...

    • A Three-Dimensional Elastic-Plastic Analysis of Rolling Contacts 

      Benchea, Marcelin; Crețu, Spiridon (UDJG, 2010)
      An analysis model has been developed to model the nonlinear strain rate dependent deformation of rolling bearing steel stressed in the elastic-plastic domain. The model is designed in the frame of the incremental theory ...

    • 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 Aspects of Electrode-Elastomer Contact 

      Cârlescu, Vlad; Olaru, Dumitru; Prisăcaru, Gheorghe (UDJG, 2010)
      Dielectric elastomers (DE) are soft polymers based smart materials that may be potentially employed in applications such as actuation, sensing and energy harvesting. The performance of dielectric elastomer actuators (DEA) ...

    • 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 ...

    • Tribological Behaviour of CO-CR-MO and Uhmwpe the Components of Intervertebral Disc Prosthesis 

      Iliuță-Crețan, Monica; Munteanu, Florin; Gafițanu, Mihai (Universitatea ”Dunărea de Jos” din Galați, 2006)
      The Intervertebral Disc Prostheses consist of a modular system and his function is based on low intervertebral friction. As a result of friction forces acting to the spine structures, the intervetebral disc prostheses can ...

    • 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 ...

    • Ultrasound Action on Strength Properties of Polycrystalline Metals 

      Moraru, Luminița (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. ...

    • Upon Fretting Behaviour in a Hertzian Point Contact 

      Irimescu, Luminita; Ciornei, Florina; Berthier, Yves (UDJG, 2010)
      Fretting is known as a wear process occurring in a small amplitude cyclic motion of two solid contacting surfaces and it can affect the fatigue resistance of the material, inducing wear and cracking. The kinematics ...

    • Upon Friction on a Ball Bearing - Outer Raceway Contact - I. Uniform Loading of the Balls 

      Irimescu, Luminița; Diaconescu, Emanuel; Berthier, Yves (Universitatea ”Dunărea de Jos” din Galați, 2006)
      The paper advances an analytical model to evaluate the effect of micro-slip on the friction losses at the interface of a normally loaded rolling contact. The model validation was done by comparing the theoretical results ...

    • Upon Radial Fretting of Dissimilar Materials 

      Ciornei, Florina; Irimescu, Luminița; Diaconescu, Emanuel (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 ...