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Vol 13, No 2 (2019)

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Authors in this issue:

Akindele M. Okedoye, Dejan Divac, Dragan Rakić, Gian C. Rana, Gunamani Deheri, Hemlata Saxena, Hocine Tebbiche, Ismail I. Safarov, Ivana Vasovic Maksimovic, Jimit R. Patel, Katarina Maksimovic, Lubomyr Ya. Ropyak, Mina Djuric, Mirko Maksimovic, Miroslav Živković, Mirziyod Mirsaidov, Mohammed Saîd Boutoudj, Muhsin Kh. Muhsin Kh., Nenad Grujović, Oleg Yu Pazen, Poonam Gautam, Roman M. Tatsiy, Sergiy Ya. Vovk, Slobodanka Boljanovic, Sulyman O. Salawu, Tetiana O. Pryhorovska, Vladimir Dunić,

Published: 01.12.2019.

Contents

01.12.2018. Research paper
RESIDUAL FATIGUE LIFE ESTIMATION OF CRACKED AIRCRAFT STRUCTURAL COMPONENTS UNDER LOAD SPECTRUM

This work deals with fatigue behaviour of cracked aircraft structural components under cyclic loads of constant amplitudes and load spectrum. This investigation is focused on developing efficient and reliable computational methods for fatigue life estimation of cracked aircraft lugs under cyclic loads of constant amplitude and load spectrum. For cr...

By KATARINA MAKSIMOVIC, SLOBODANKA BOLJANOVIC, MINA DJURIC, IVANA VASOVIC MAKSIMOVIC, MIRKO MAKSIMOVIC

01.12.2018. Research paper
MODELING OF DAMAGED CONCRETE USING INITIAL DEGRADATION PARAMETER

A stress-strain history in the material of real concrete structures is usually unknown. An effect of concrete degradation is analyzed to describe how the initial degradation parameter can describe the stress-strain history. The idea is to introduce the initial damage of the structure by the degradation parameter to calculate the internal variables ...

By DRAGAN RAKIĆ, VLADIMIR DUNIĆ, MIROSLAV ŽIVKOVIĆ, NENAD GRUJOVIĆ, DEJAN DIVAC

01.12.2018. Research paper
ELECTROHYDRODYNAMIC THERMAL INSTABILITY IN A WALTERS’ (MODEL B') ROTATING NANOFLUID SATURATING A POROUS MEDIUM

The onset of thermal instability in a dielectric rotating nanofluid layer saturating a porous medium with vertical AC electric field is investigated by employing Darcy model for porous medium. The rheology of the nanofluid is described by Walters’ (model B’) for calculating the shear stresses from the velocity gradients. The employed mo...

By GIAN C. RANA, POONAM GAUTAM, HEMLATA SAXENA

01.12.2018. Research paper
NUMERICAL STUDY ON HEAT TRANSFER IN MULTILAYERED STRUCTURES OF MAIN GEOMETRIC FORMS MADE OF DIFFERENT MATERIALS

The article proposed a general research scheme of heat transfer process in multilayer constructions for three basic geometric forms in order to simulate fire distribution. The scheme is based on linear differential equations, the Fourier method and the modified method of Eigen functions. The work considers five different layers’ design and do...

By ROMAN M. TATSIY, OLEG YU PAZEN, SERGIY YA. VOVK, LUBOMYR YA. ROPYAK, TETIANA O. PRYHOROVSKA

01.12.2018. Research paper
VISCOSITY VARIATION EFFECT ON THE MAGNETIC FLUID LUBRICATION OF A SHORT BEARING

The performance of a magnetic fluid based short bearing is examined with the effect of viscosity variation. The pressure temperature relation of Tipei (1962) concerning viscosity variation is adopted here. The Neuringer-Rosensweig’s model has been considered for the magnetic fluid flow. The related modified Reynolds type equation is solved fo...

By JIMIT R. PATEL, GUNAMANI DEHERI

01.12.2018. Research paper
TURBULENT FLOW CONTROL WITH VORTEX GENERATORS AROUND A SYMMETRICAL AIRFOIL AT HIGH ATTACK ANGLES

The flow on the upper surface of NACA 0015 airfoil is subject to an adverse pressure gradient when the incidence increases. This leads to the boundary layer separation which causes losses in the aerodynamic performances. Control using Vortex Generators (VGs) is a simple passive mean used to delay or eliminate the flow separation from the wall. The ...

By HOCINE TEBBICHE, MOHAMMED SAÎD BOUTOUDJ

01.12.2018. Research paper
EFFECT OF NONLINEAR RADIATIVE HEAT AND MASS TRANSFER ON MHD FLOW OVER A STRETCHING SURFACE WITH VARIABLE CONDUCTIVITY AND VISCOSITY

A theoretical investigation on the flow of nonlinear magnetohydrodynamic (MHD), laminar, viscous, incompressible boundary layer fluid with thermal radiative heat transfer and variable properties past a stretching plate was carried out. The liquid is taken to be gray, absorbing, emitting but with non-scattering medium. The main nonlinear equations g...

By AKINDELE M. OKEDOYE, SULYMAN O. SALAWU

01.12.2018. Research paper
OSCILLATIONS OF MULTILAYER VISCOELASTIC COMPOSITE TOROIDAL PIPES

This article discusses a method for calculating the dynamic characteristics of thin-walled viscoelastic composite pipes made by continuous winding under the influence of internal hydrodynamic pressures. The solution is based on an approximate energy method based on the instant theory of shells and the second-order Lagrange equation. Initial technol...

By MUHSIN KH. MUHSIN KH., ISMAIL I. SAFAROV, MIRZIYOD MIRSAIDOV

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