Fascicula VIII: Recent submissions

Afișează articolele 121-140 of 160

    • Microdefects Analysis of Dental Contact Surfaces 

      Frunza, Gheorghe; Frunza, Mihai Cătălin; Suciu, Cornel (UDJG, 2010)
      The tribological processes influence the behaviour of the biocontacts between biological bodies, between biomaterials or between biological bodies and biomaterials. Whether natural or artificial, any biocontact is the locus ...

    • Experimental Research for Measuring Friction Forces from Rod Sealing at the Hydraulic Cylinders 

      Drumea, Petrin; Cristescu, Corneliu; Fatu, Aurelian; Hajjam, Mohamed (UDJG, 2010)
      The paper presents experimental equipment and research results conducted by Hydraulics and Pneumatics Research Institute INOE 2000-IHP Romania in cooperation with Institute PPRIME – University of Poitiers France, in order ...

    • 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 ...

    • Dynamic Response of Ship Hull Composite Laminated Shells to Explosive Pressure 

      Chirica, Ionel; Boazu, Doina; Beznea, Elena-Felicia; Shenoi, R.Ajit (UDJG, 2010)
      The paper presents selected results of a study concerning the protective capacity of ship hull structures made of composite materials subjected to an explosion of a spherical charge. The main application of these structures ...

    • 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) ...

    • 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 ...

    • Elastic-Plastic Contact Modeling. Part II: Numerical Simulations and Program Validation 

      Diaconescu, Emanuel; Spînu, Sergiu (UDJG, 2010)
      Elastic plastic spherical contact is simulated using an algorithm proposed in a companion paper. Materials of contacting bodies are assumed to have different behaviours: rigid (R), elastic (E), elastic-plastic with isotropic ...

    • Elastic-Plastic Contact Modeling. Part I: Algorithm Overview and Assessment of Plastic Strain Increment 

      Spînu, Sergiu; Diaconescu, Emanuel (UDJG, 2010)
      A fast algorithm for elastic-plastic contact simulation is overviewed in this paper. Betti’s reciprocal theorem is employed to assess surface normal displacement and stress state in an elastic half-space in the presence ...

    • Monitoring the Influence of Thermomagnetic Treatment on the Ion Nitrided Layer Using Microhardness Curves, for 42MOCR11 Steel Grade Case 

      Papadatu, Carmen-Penelopi (UDJG, 2010)
      Each of the stages of heat treatment in magnetic field (AC or DC) influences the hardness and durability of different steels. This influence is extended in the case of the measured microhardness values obtained in the ...

    • Surface Roughness Parameters Evolution Under Fatigue Loading 

      Mereuță, Valentin V.; Palaghian, Liviu C. (UDJG, 2010)
      The main objective of this paper is to demonstrate that in order to have a complete characterisation of fatigue degradation it is necessary to analyze the evolution of surfaces roughness, which can become a stress ...

    • The Influence of the Sintering Atmospheres on the Wear Behaviour of the Copper Based Alloys 

      Gheorghe, Ștefan; Teișanu, Cristina; Merstallinger, Andreas; Ciupitu, Ion (UDJG, 2010)
      The Powder Metallurgy (PM) technique allows manufacturing the sintered selflubricating materials having a high wear resistance. It is well known that the small and medium sized bearings are processed by PM with better ...

    • Numerical and Experimental Investigations Upon Articular Cartilage Mechanical Hysteresis 

      Frunză, Gheorghe; Ciornei, Florina (UDJG, 2010)
      The paper presents biomechanical and tribological considerations upon articular cartilage. The experimental in vitro results from static and dynamic contact tests are presented together with numerical modelling of the ...

    • 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 ...

    • Power Losses Estimation in Precessional Gear 

      Bostan, Ion; Dulgheru, Valeriu; Bodnariuc, Ion (UDJG, 2010)
      Having established the estimation relations of power losses in basic kinematical joints, it becomes relatively simple to establish the estimation relation of kinematical precessional transmission efficiency which, on the ...

    • Postbuckling Behaviour of Composite Plates with Imperfections 

      Beznea, Elena-Felicia; Chirică, Ionel; Das, Purnendu K. (UDJG, 2010)
      The aim of the work presented in this paper is to analyze the influence of the imperfections on the changes in the buckling behaviour of ship deck plates made of composite materials. Thus, parametric analysis of the ...

    • 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 ...

    • 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 ...

    • Ecological Lubricants Based on Vegetal Oils 

      Ștefănescu, Ioan; Șolea, Liviu; Chiriță, George (UDJG, 2011)
      Recently, there is an ecologically justified tendency to use lubricants based on vegetal oils and synthetic fluids, both ones reducing the application field of mineral oils. Biodegradable lubricants will be more used in ...

    • Elastic Frictional Contact under Normal and Tangential Loading 

      Spînu, Sergiu; Grădinaru, Dorin (UDJG, 2011)
      A robust algorithm for elastic contact simulation considering tangential tractions is advanced in this paper. Two similar numerical models are advanced for the normal, as well as for the tangential direction, and the ...

    • A Method to Evaluate the Durability of Sucker Rod Pumps and to Reduce Corrosive Wear 

      Ripeanu, Razvan George (UDJG, 2011)
      The paper presents experimental tests made in static and dynamic conditions in order to establish the wear laws for different materials’ couples at different medium temperatures and pressures. Some complex wear laws were ...