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By Bijjula Prabhakar Reddy, Oluwole Daniel Makinde, Paul Majani Matao

The paper presents the procedure of implicit stress integration for constitutive models for soil and rock. The theoretical basis of Mohr-Coulomb, Matsuoka-Nakai, Hoek-Brown and Hyperbolic soil constitutive models are presented. Stress integration was performed using the theory of incremental plasticity. The general procedure of implicit stress inte...

By Dragan Rakić, Miroslav Živković

This paper presents the integration of muscle fatigue modeling into the finite element solver PAK, based on an extended version of Hill’s phenomenological model. While traditional muscle models focus primarily on force generation, this study incorporates fatigue dynamics to provide a more realistic representation of muscle performance over ti...

By Boban Stojanović, Miloš Kojić, Srboljub Mijailovich

This paper describes software developed based on numerical implementation of algorithms for coupled acoustic – structure interaction. This class of problems implies coupling of the fluid domain, with sound wave propagation, and the domain of solid, which vibrates under the pressure caused by sound waves from the fluid domain. The physical beh...

By Velibor Isailović, Nenad Filipović, Milica Nikolić, Miloš Kojić

X-ray angiography is one of the diagnostic procedures applied in clinical practice to analyze the state of patient-specific coronary arteries. During this examination a parameter called fractional flow reserve (FFR) is invasively measured to quantitatively assess the existence of potential stenosis and its significance. The software proposed in thi...

By Tijana Đukić, Ognjen Pavić, Lazar Dašić, Tijana Geroski, Nenad Filipović

In this paper, we give a short overview of the basic concept of stress integration for inelastic material models. This methodology was introduced by the author, initially for thermo-elasticplastic and creep deformation of metals, termed as ‘effective-stress-function’ (ESF), and then generalized to the ‘governing parameter method&r...

By Miloš Kojić

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

Agitator shapes are of paramount importance in mixing processes, prompting researchers to explore new configurations to improve these operations. Our study focuses on the three-dimensional fluid dynamics in a flat-bottomed cylindrical tank equipped with different anchor shapes, ranging from the standard configuration to modified variants. Using bot...

By Abderrahim Sidi Mohammed Nekrouf, Sarra Youcefi, Mohamed Bouzit

This paper explores the dynamics and stability of measles infection within a specified population, utilizing the SEIRV+D model. The study commences by establishing the equilibrium points and determining the reproduction number. The stability of this equilibria is contingent on the calculated reproduction number. The research draws upon real data ob...

By Maja Kukusheva Paneva, Natasha Stojkovik, Vladimir Milićević

The need for effective CPU cooling has become increasingly important with the growing demand for computing performance. In this paper, we numerically investigate the problem of active CPU cooling using hybrid nanofluids. The studied heatsink consists of a parallelepiped-shaped block filled with a hybrid nanofluid, crossed by four tubes through whic...

By Melouka Benyamina, Abderrahim Mokhefi