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Publications
Publications (37)
This work considers fatigue strength behavior of construction made from composite materials. Primary attention in this work is focused to fatigue strength behaviors of helicopter tail rotor blade made from composite materials. In this investigation some aspects of design and experimental verification of composite structural elements are considered....
This paper considers computational fluid dynamics (CFD) analysis and experimental test strength verification of the UAV wing made of composite materials. The CFD calculation and static strength testing results of specific UAV wing are illustrated. Specific attention was given to the definition of aerodynamics loads acting on UAV wing and experiment...
One of the consequences of the growth of the world industry is the increased need for electricity. It is imperative for developed countries to use renewable sources, both due to the declining reserves of conventional fuels and the reduction of environmental pollution. The unstoppable growth in the use of alternative sources is more than evident in...
In the base, working of ventilation system can be analyzed in regular and incidental modes of operation. This paper concerns the specification of the longitudinal ventilation necessary to prevent upstream movement of combustion products in a tunnel fire. In this work the objective of the study is to analyze the road way tunnel ventilation system us...
![Fig. 3 Stewart platform [44] with universal and spherical joints](profile/Jelena-Vidakovic-2/publication/349434766/figure/fig3/AS:1095415206281217@1638178745855/Stewart-platform-44-with-universal-and-spherical-joints_Q320.jpg)
Safe and efficient training using flight simulation training devices (FSTD) is one of the fundamental components of training in the commercial, military, and general aviation. When compared with the live training, the most significant benefits of ground trainers include improved safety and the reduced cost of a pilot training process. Flight simula...
The thermomechanical buckling and postbuckling behavior of layered composite shell type structure are considered with the finite element method (FEM) under the combination of temperature load and applied mechanical loads. To account for through-thickness shear deformation effects, the thermal elastic, Higher-Order Shear deformation Theory (HOST) is...
This work presents total fatigue life prediction methodology of aircraft structural components under general load spectrum. Here is presented an effective computation procedure, that combines the finite element method (FEM) and strain-life methods to predict fatigue crack initiation life and fatigue crack growth model based on the strain energy den...
A nonlinear finite element method, based on the von Karman-High Order Shear Deformation Theory (HOST) and on the principle of minimal total potential energy, is used for the analysis of buckling and post buckling behavior and of the first-ply failure of an axially compressed laminated type composite structure. For this purpose and for the analysis...
This work considers the buckling and postbuckling behaviour of axially compressed layered composite panels including initial failure analysis. For determination stresses in layered composite panels Finite Element Method (FEM) used. A series of experiments were conducted to verify the FEA-results, but also to address the stability and strength of th...
The work presents a residual fatigue life prediction methodology of cracked structural components under interspersed mode-I and mixed-modes (I and II). In this paper the numerical computation methods and procedures for predicting the fatigue crack growth trajectories and residual fatigue lives of notched structural components are analyzed. Special...
Global demand for electrical energy is in constant growth because of the constant increase in the number of inhabitants and the economy growth. This paper presents the way the increasing demand for energy and the constant increase in the capacity of power plant production systems exacerbates the working conditions of the system parts and leads to t...
The subject of this investigation is focused on developing computation procedure for strength analysis of damaged aircraft structural components with respect to fatigue and fracture mechanics. For that purpose, here will be defined computation procedures for residual life estimation of aircraft structural components such as wing skin and attachment...
The aim of this paper was to determine the causes of screws failures in compressor valves, obtained from petroleum industry. The analysed screws were in exploitation and deposition coated. Before the fracture analysis, control calculation of screws is done in order to determine, if the screws are properly dimensioned. After visual and radiographic...
Attention in this work is focused to crack growth analysis and residual life estimation of metal structural components under mixed modes I/II. Primary attention of this investigation is numerical simuation crack growth trajectory. For this purpose FEM is used together with the maximum tangential stress (MTS) criterion. To determine crack growth tra...
This work focuses on defining loads and fatigue life estimation of helicopter tail rotor blades. The original metal construction of these blades was replaced with a new construction of blades made from composite materials. The subject of this investigation is the precise determination of loads of helicopter composite tail rotor blades together with...
Ventilation mill for grinding coal is one of the main steam power plants in the system that makes a significant effect on the level of energy efficiency with its work. The aim of this paper is to increase the energy efficiency of thermo power plant Kostolac B by reducing the problem of wear in ventilation mill for coal grinding. The idea of this re...
The subject of this investigation is focused on developing a computation procedure for optimal design of aircraft structural components with respect to stress, displacement and technology constraints. Attention is focused on minimal weight design of plates with a reinforced hole. The optimal design procedure is based on combining the finite element...
În lumea afacerilor expresia “timpul înseamnă bani” este proverbială. Când este vorba despre risc, trebuie să avem în vedere faptul că “riscul înseamnă bani” și în același timp “cine nu riscă, nu câștigă”.
Sunteți pregătiți să riscați ? Știți exact ce riscați ? Până unde puteți risca ? sunt doar câteva întrebări la care orice manager trebuie să ști...
Primary attention of our investigation during the last ten years has been focused on the development of efficient computation methods and corresponding software for strength analyses of flight structures such as aircraft, helicopter and tactical UAV structures. In these investigations the complete computation methods/procedures are developed and co...
Rotational components of aero engine turbine are the most important components. It operates at high temperature and under conditions of extreme environmental attack such as oxidation, corrosion and wear. These conditions can cause cracking of rotational components. The failure damage modes of turbine are classified in terms of main components as fl...
This paper presents results of the suction plate surface modification by hardfacing, of the ventilation mill in the Kostolac B power plant. Before applying hardfaced suction plates to exploitation conditions, it is necessary to study model hardfaced samples for determining the optimal tech-nology and filler material for revitalization. Experimental...
To define load spectra of main rotor blades in this study computational fluid dynamics (CFD) software is used. The aim of the present investigation is the development of a CFD computation procedure capable of accurately simulating the flow around a full helicopter especially around main rotor blades. For this purpose the complete helicopter configu...
The aim of this paper is improving the characteristic of Ventilation mill for grinding coal, which is one of the main parts of steam power plants in the system that makes a significant influence on the level of energy efficiency with its work. Working parts of the mill are dominantly exposed to intensive abrasive and erosive wear during exploitatio...
Numerical simulations are powerful tool for analyzing and research in domain of mechanical constructions. In welded joints is very important to determine residual stresses and temperature distribution in sample, apropos, element of construction. For welded construction that are in exploitation is not possible doing experiments, so numerical simulat...
An attention in this paper is focused on the stress analysis and the determination of fracture mechanics parameters in low pressure (LP) turbine rotor discs and on developing analytic expressions for stress intensity factors at the critical location of LP steam turbine disc. Critical locations such as keyway and dovetail area experienced stress con...
This paper considers the determination of the crack growth trajectory and residual life for the two-dimensional structural elements under mixed modes. To study crack growth behaviour, a specimen with two holes and a crack between them is considered. This crack is defined as achieving a mixed-mode I/II crack growth trajectory. To produce a crack gro...
This paper presents evaluation fracture mechanics parameters in low pressure
turbine components. Critical locations such as keyway and dovetail area are
experiencing stress concentration leading to crack initiation. Stress
intensity factors were evaluated using the J-Integral approach available
within ANSYS software code. The finite element method...
The most important characteristics for service safety of complex metal structures are those describing crack initiation and growth caused by static or dynamic, variable loading. Crack initiation and growth is subject of numerous investigations by different methods. The paper shows the possibility of applying infrared thermography to the problems of...
This paper's objective is to establish convenient and efficient numerical models for the crack propagation analysis of structural elements with initial damages. The goal of this paper is the establishment of computation methods for the evaluation of the residual life of structural elements in the presence of initial damage which appears in the form...
This work considers the analytical/numerical methods and procedures for obtaining the stress intensity factors and for predicting the fatigue crack growth life of notched structural components. Many efforts have been made during the past two decades to evaluate the stress intensity factor for corner cracks and for through cracks emanating from fast...
The subject of this work is focused on strength analysis of filament-wound composite tubes made of E glass/polyester under internal pressure. The primary attention of this investigation is to develop a reliable computation procedure for stress, displacement and initial failure analysis of layered composite tubes. For that purpose we have combined t...
The subject of this paper is research of the characteristics of shock absorbers of collision energy of passenger trains operating on the principle of tube compression into a special cone-like ring with a reduced diameter [1]. The absorber’s role is to absorb as much of the collision kinetic energy as possible by controlled deformation, in order to...
In this paper, Manual Metal Arc Welding of carbon steel plates was studied. The finite element analysis of residual stresses in butt welding of two similar plates is performed with the ANSYS software. This analysis includes a finite element model for the thermal and mechanical welding simulation. It also includes a moving heat source, material depo...
This work investigates the behavior of structural components with surface cracks 1,2 . The attention is focused on a circular bar with an elliptical surface crack under tension load. The aim of this study is to analyze the influence of the shape and size of cracks at the structural part on the fracture mechanics parameters. Stress intensity factors...
Aerodynamic problems in railway trains are closely associated with flows occurring around trains. The main objective of this paper is to present the results of the finite element method for stress and stability analysis of aerodynamic brakes in high speed trains (HST). The aerodynamic brake is defined as a stiffened plate subjected to lateral press...
Projects
Projects (2)
Technological Development Research Program – Ministry of Science and Technological Development, Serbia
Provide a training course support on Industrial Risk Management (IRM). The project contributes to the development of knowledge in the field of technological risk assessment and in the field of environment management as it promotes new integrated technologies in an innovative system, specific tools for quantitative assessment of technological risks in industrial installations which use dangerous substances in the fabrication process with potential pollution risk.
