Căutare după Autor "Diaconescu, Emanuel"

Afișează articolele 1-14 of 14

    • 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 ...

    • 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 ...

    • Experimental Determination of Contact Area Between a Sphere and a Circular Plate Using a Technique Based on Laser Profilometry 

      Trandafir, Marius; Ciornei, Maria; Diaconescu, Emanuel (UDJG, 2011)
      This paper presents the experimental determination of contact area between a steel sphere and a sapphire circular plate, using a technique based on laser profilometry. The reflectivity value is smaller inside contact area ...

    • Experimental Preliminary Research Regarding Normally and Tangentially Loaded Contacts 

      Ciornei, Maria; Trandafir, Marius; Diaconescu, Emanuel (UDJG, 2011)
      The purpose of this paper is to determine the contact area for a contact between a steel sphere and a sapphire disk loaded normally and tangentially, using laser profilometry. For this, was used an experimental device ...

    • 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, ...

    • Hysteresis and Mechanical Fatigue 

      Frunză, Gheorghe; Diaconescu, Emanuel (Universitatea ”Dunărea de Jos” din Galați, 2006)
      The material dumping, known also as inner friction or, simply hysteresis, is considered to be related to energy dissipation in the volume of a macro-continuous medium. This phenomenon takes place when a more or less ...

    • Interaction Between Two Unequal Circular Holes Lying in a Sheared Elastic Plane 

      Alaci, Stelian; Diaconescu, Emanuel; Frunză, Gheorghe (Universitatea "Dunărea de Jos" din Galaţi, 2006)
      The paper presents an analytic solution for the stress states in an elastic plan where two unequal circular holes are lying. At infinity, the elastic plane is sheared. To solve the problem, the authors used bipolar ...

    • Numerical Modelling of 3D Impact 

      Stelian, Alaci; Diaconescu, Emanuel; Ciornei, Florina; Irimescu, Luminița; Cerlincă, Delia; Rusu, Ovidiu (UDJG, 2010)
      The paper presents a virtual device designed for studying tri-dimensional impact. The main goal of the work is to present a solution for finding the coefficient of restitution for the tri-dimensional case of a sphere ...

    • Research Issues on Punch - Circular Plate Elastic Contacts 

      Trandafir, Marius; Diaconescu, Emanuel (UDJG, 2010)
      Circular plates enter into the category of finite dimension bodies. Solutions regarding the displacements and stresses, which appear at the contact involving finite dimension bodies and also numerical and analytical results ...

    • A Simple Device for Modelling Bioarticular Joint Friction 

      Bejinariu, Brîndusa; Diaconescu, Emanuel (UDJG, 2011)
      In this paper a simple device for modelling bioarticular friction is presented. The experimental device serves to simulate the movement as it would take place in a knee joint. Key components of the experimental device are ...

    • Singular Points in an Elastic Half-Plane Containing a Circular Hole, Loaded by a Normal Point Force on the Straight Boundary 

      Alaci, Stelian; Diaconescu, Emanuel; Frunză, Gheorghe (Universitatea "Dunărea de Jos" din Galaţi, 2006)
      These authors published theoretical results upon the stress state induced in an elastic half-plane containing a circular hole by a point force applied on its boundary. The solutions were found in bipolar co-ordinates and ...

    • 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 ...

    • Viscosity of Amorphous Molecular Substances 

      Diaconescu, Emanuel; Zegrean, Vlad Flaviu; Onciul Miron, Oana (Universitatea ”Dunărea de Jos” din Galați, 2008)
      Because the great majority of flow units in a liquid behave instantaneously in a solid-like manner, rheological properties of molecular liquids subjected to high pressures may be measured by using corresponding molecular ...