USER INTERFACES CAD SOFTWARE FOR PRE- AND POST- PROCESSING OF MODELS ACCOMPANYING PAK FE CODE
This paper introduces the CAD user interface software developed to support example-driven simulations using the PAK finite element code. Built upon years of research and development by the authors, CAD represents a custom-built platform for three-dimensional model setup and result visualization, tightly integrated with the PAK solver. It facilitate...
By Miljan Milošević, Vladimir Simić, Bogdan Milićević, Velibor Isailović, Vladimir Ranković, Miloš Ivanović, Žarko Milošević, Dalibor Nikolić, Danko Milašinović, Arso Vukićević, Lazar Otašević, Mileta Stojanović, Nenad Filipović, Miloš Kojić, Boban Stojanović
HEART MODEL FOR ELECTROPHYSIOLOGY, MECHANICS AND BLOOD FLOW
Cardiovascular diseases are among the leading causes of mortality worldwide, necessitating advanced computational modeling to study their underlying mechanisms and explore potential treatments. In this paper, we present a multiphysics computational model that integrates cardiac mechanics, electrophysiology, and mass transport, implemented within th...
By Miljan Milošević, Bogdan Milićević, Vladimir Simić, Nenad Filipović, Miloš Kojić
A COMPUTATIONAL MODEL DEVELOPED TO DEMONSTRATE THAT DURING THE SPIDER SILK SPINNING INTERNAL DIFFUSION GOVERNS WATER REMOVAL – A PROCESS CENTRAL TO THE GENERATION OF SPIDER SILK’S EXCEPTIONAL MECHANICAL PROPERTIES
Solvent removal by diffusion from a polymer solution occurs in various technological processes, such dry spinning of synthetic silk-like fibers. There, it is important to determine the diffusion coefficient which is dependent on the solvent concentration, assuming the validity of Fick’s law. In order to prove the internal diffusion within the...
By Aleksandar Kojić, Miloš Kojić, Nikola Kojić
FATIGUE TO FRACTURE INTEGRITY ASSESSMENT IN ENGINEERING AND BIOMEDICAL ENGINEERING
Degradation of structural integrity and fatigue life estimation remain critical challenges in engineering, including biomedical applications. Fracture mechanics and crack propagation prediction are highly sensitive to material parameters, with the Stress Intensity Factor being the most significant physical parameter for the estimation of crack stre...
By Gordana Jovičić, Vladimir Milovanović, Aleksandra Vulović, Miroslav Živković, Nenad Đorđevič, Nenad Filipović
OVERVIEW OF EXPLICIT AND IMPLICIT DYNAMIC FEM ANALYSIS IN PAK SOFTWARE
Dynamic analysis of engineering structures is essential in the design process, providing insights into their behavior under various loading conditions. This paper focuses on the comparative study of implicit and explicit dynamic analysis methods using the PAK software and FEMAP with the Nastran software. Both methods have distinct advantages and di...
By Vladimir Dunić, Miloš Pešić, Miroslav Živković, Radovan Slavković
SELECTED EXAMPLES OF THE APPLICATION OF PAK SOFTWARE FOR MODELING THE BEHAVIOUR OF COMPLEX ENGINEERING STRUCTURES
The paper presents various examples of the application of the PAK software and its modules for thermal, filtration, and stress–strain analysis of different complex engineering structures such as gravity dams, arch dams, embankment dams, tunnels, and mines. Examples of research, studies, and projects in which PAK has been applied to assess the...
By Dejan Divac, Slobodan Radovanović, Maja Pavić, Nikola Milivojević, Vladimir Milivojević, Miroslav Živković, Dragan Rakić, Snežana Vulović
TURBULENT FLUID FLOW MODEL WITH APPLICATION IN BIOMEDICINE
Two-equation turbulent models are widely used in finite element analysis of fluid flow. The PAK program package was upgraded from the classical laminar flow to the turbulent k-omega model. The turbulence model was validated using the case of fluid flow in a backward-facing step channel. The analysis results show good agreement with experimental dat...
By Aleksandar Nikolić, Miroslav Živković, Nenad Filipović, Marko Topalović
PROJECT RISKS DURING THE COVID-19 PANDEMIC AND THEIR EFFECTS ON DELAYS AND COST OVERRUNS
The COVID-19 pandemic has significantly impacted project implementation costs and caused delays across numerous industries. Various analysis found in the literature show that the predominant cause of project delays and higher costs have been people, material, and equipment movement restrictions, supply chain disruptions, and social distancing polic...
By Ilija Stojanović, Marko Selaković, Marija Gačić, Milica Kaplarević, Nenad Filipović
INVERSE IDENTIFICATION METHOD OF PLASTICITY PARAMETERS OF ANISOTROPIC MATERIAL
Nowadays, the finite element method has been widely applied in product calculation and design. One of the critical parameters in finite element modeling are the parameters in the material behavior model. In this study, an inverse procedure determines the values of parameters in the behavior model of anisotropic materials. First, optimization algori...
By Dao Lien Tien, Viet Dung Luong
In this paper, a new design of solar air-water heater for the purpose of performance improvement is introduced for the first time. This thermal system will be a good alternative for both space heating and providing domestic hot water for use in buildings. In the proposed solar collector, the absorbed incoming solar irradiation is transferred into b...
By Seyyed Abdolreza Gandjalikhan Nassab