The perpetual points have been defined recently as characteristic points in a dynamical system. In many unexcited linear and nonlinear mechanical systems, the perpetual points are associated with rigid body motions and form the perpetual manifolds. The mechanical systems that admit rigid body motions as solutions are called perpetual. In the extern...

By FOTIOS GEORGIADES

Molecular dynamics simulations of the rigid-anvil collision test are performed by using a two-dimensional computational setup that mimics the traditional ballistic Taylor test. In this extensively utilized computational setup, the slender nanoscale projectiles collide with a rigid wall with hypersonic striking velocities ranging from 3 km/s to 30 k...

By SRETEN MASTILOVIĆ

The aims of this work are to investigate and compare two different flow dynamics techniques (steady state - pulsatile flow) for endothelial shear stress calculation, compare lesion specific smartFFR and ESS values, as well as total vessel smartFFR and ESS values, and investigate the relationship between smartFFR and ESS to stress MBF (myocardial bl...

By PANAGIOTIS K. SIOGKAS, GEORGIOS-ELEFTHERIOS KALYKAKIS, CONSTANTINOS D. ANAGNOSTOPOULOS, THEMIS P. EXARCHOS

The basic definitions and a history of the development of biomimetics as a discipline that considers nature-inspired design are presented in this paper. The discussion and the results of the application of principles of nature-inspired design in machine elements design are given. The fact that transition zones that Nature chose and designed on tree...

By IVANA D. ATANASOVSKA, DEJAN B. MOMČILOVIĆ

Kirchhoff plate bending and Winkler-type contact problems with different boundary conditions are solved with the use of physics-informed neural networks (PINN). The PINN is built on the base of mechanics laws and deep learning. The idea of the technique includes fitting the governing partial differential equations at collocation points and then tra...

By ALIKI D. MURADOVA, GEORGIOS E. STAVROULAKIS

This is a feasibility study for the application of a novel concept of single-needle device for localized chemotherapy. Systemic chemotherapy has numerous and severe side effects. To conduct localized (electro)chemotherapy, we designed a novel device that does not currently exist on the market. Electrochemotherapy is based on the cell membranes temp...

By ALEKSANDAR CVETKOVIĆ, DANIJELA CVETKOVIĆ, DANKO MILAŠINOVIĆ, NEMANJA JOVIČIĆ, NIKOLA MIAILOVIĆ, DALIBOR NIKOLIĆ, SLOBODANKA MITROVIĆ, NENAD FILIPOVIĆ

Vibration suppression has been thoroughly studied in the last few years. A number of methods has been proposed for this purpose. An evolving method lies in the search of band gap regions, that is, certain frequency ranges where vibrations are isolated. In the present investigation, a periodic unit cell of a chiral metamaterial has been created in o...

By PANAGIOTIS KOUTSIANITIS, GEORGIOS K. TAIRIDIS, ALEXANDROS KOUGKOULOS, GEORGIOS E. STAVROULAKIS

In this paper, turbulent fluid flow is analyzed using a two-equation turbulent finite element model that can calculate values in the viscous sublayer. Implicit integration of the equations is used for determining the fluid velocity, fluid pressure, turbulence, kinetic energy, and dissipation of turbulent kinetic energy. These values are calculated ...

By ALEKSANDAR NIKOLIĆ, MARKO TOPALOVIĆ, VLADIMIR SIMIĆ, MILAN BLAGOJEVIĆ

The purpose of this research was to investigate the prospect of continuous flow modelling in LS-DYNA using SPH-FEM coupling. The both methods (SPH and FEM) are based on the continuum mechanics, however, SPH implementation uses Lagrangian material framework, while FEM uses an Eulerian formulation for the fluid analysis, and Lagrangian formulation fo...

By MARKO TOPALOVIĆ, ALEKSANDAR NIKOLIĆ, SNEŽANA VULOVIĆ, VLADIMIR P. MILOVANOVIĆ

Elastic strain is covered by the effective medium homogenization method inside a representative volume element (RVE). It has an incremental quasi rate-independent (QRI) form obtained by the endochronic concept of thermodynamic time. The rate dependence takes place by means of stress rate dependent value of the initial yield stress. Free meso rotati...

By LJUDMILA T. KUDRJAVČEVA, MILAN V. MIĆUNOVIĆ

The procedure for identifying concrete damage plasticity material model parameters is presented in this paper. Concrete damage plasticity material model represents a constitutive model which is based on a combination of theory of plasticity and theory of damage mechanics. This material model is often used in solving geotechnical problems due to its...

By DRAGAN M. RAKIĆ, ALEKSANDAR S. BODIĆ, NIKOLA J. MILIVOJEVIĆ, VLADIMIR LJ. DUNIĆ, MIROSLAV M. ŽIVKOVIĆ