This paper deals with jet engines compressor disks which have dovetail joints with blades. A compressor disk with reduced fatigue resistance was taken as an example. Two simplified conceptual solutions of the dovetail joint with blades were devised. Based on the low cycle fatigue theory, the crack initiation life of their critical parts with newly-...

By Strain Posavljak, Gordana Tosic, Katarina Maksimovic

In this study, a new numerical method based on the combination of High Exploration Particle Swarm Optimization (HEPSO) and Moving Least Squares (MLS) is introduced to solve nonlinear porous media equations. The MLS scheme is employed to describe an appropriate discretized function, and the penalty method is implemented to convert the constrained pr...

By Mohammad Javad Mahmoodabadi, Ali Reza Ghanizadeh

In this research, analysis of entropy generation for mixed convection fluid flow in a trapezoidal enclosure is numerically investigated. To achieve this goal, the influences of Grashof number, Reynolds number and inclination angle of enclosure side walls on the distributions of the velocity and temperature fields and the values of entropy generatio...

By Meysam Atashafrooz, Mohsen Shafie

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

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

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

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

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

During the total or partial hip replacement procedure, a damaged part of the hip joint is replaced with an artificial one. Both types of procedures include removal and replacement of the femoral head. After the femoral head is removed, an implant is inserted into the hollow femur. When the healing process starts, the newly formed bone interlocks wi...

By Aleksandra Vulovic, Nenad Filipovic

This research deals with the study of the irreversibility of three-dimensional mixed convection flow in an inclined duct with step. To reach this goal, an analysis of entropy generation is carried out according to the second law of thermodynamics. The effects of buoyancy force on the flow irreversibility are analyzed with all details. The results s...

By Meysam Atashafrooz, Tahereh Asadi