This paper brings the introduction of the analysis of foundation solution for the noise protection walls on the reinforced earth along the Highway Corridor Vc, a road and rail transport corridor that connects Hungary, Croatia and Bosnia and Herzegovina, included in the network of Pan-European transport corridors. A solution with pile foundations made of steel IPE profiles is presented in detail. During the design and modelling, as well as the calculation of the structural foundation, the modern software program PLAXIS was used, and the calculation was made in accordance with EN 1997 Eurocode 7, Geotechnical Design. Special attention is devoted to the analysis of the impact of driving IPE steel profiles, as foundation piles, on reinforced earth. The presented solution was then verified by an additional control calculation and a field test of the impact of the horizontal load on the bearing capacity of the IPE steel profile driven into the reinforced slope. Based on the conducted analyses and testing, it has been proven that it is possible to build noise protection walls on the reinforced earth without disturbing the internal stability and functionality of the reinforced earth.

The paper presents the engineering practice, which the company “Regeneracija” Ltd. Velika Kladuša – Bosnia and Herzegovina uses to perform preliminary experimental testing and measurements, followed by mathematical modeling of critical pressure of these vessels, in order to obtain the projected quality of pressure vessels made of composite materials. The paper will confirm the hypothesis that it is possible to relate mathematical connection and dependence of the critical pressure of vessels of composite materials (Pkr) with mechanical characteristics of vessel material (σM), vessel diameter (D), and vessel wall thickness (s). In this way, by varying the mentioned parameters, it is possible to achieve the desired product quality in the production of composite material containers by achieving the projected critical and thus working pressure. Generally speaking, the mathematical model of critical pressure obtained in this way will be a good indicator for design engineers to know how much critical pressure a given vessel can withstand, and based on that to take quick control of working or projected pressure, but also for designing completely new vessels made of composite materials as a substitute for the expensive experimental testing.

Paper received: 11.09.2017. Paper accepted: 20.12.2017. Pregledni rad REZIME Mehaničke osobine svakog materijala igraju veliku ulogu u toku izbora vrste materijala za bilo koji mehanički sistem. Jedna od osnovnih mehanička karakteristika koja je krucijalna za izbor materijala je žilavost. Rad prikazuje neke aspekte problema vezano za žilavost i zamor aluminijskih legura. U radu su također opisane standardne procedure prema ASTM i britanskom standardu prema kojima se opisuju procedure kod analize i određivanja osobina žilavosti i zamora materijala za ove vrste legura.

Z. Burzić, Military Technical Institute, Belgrade, Serbia. Dž. Gačo, F. Islamović, E. Bajramović, Technical faculty, University of Bihac,Bihac, Bosnia and Herzegovina. M. Burzić, University of Belgrade, I.C. Faculty of Mechanical Engineering, Belgrade, Serbia. In present paper, experimental investigations have included the eff ect of exploitation conditions (exploitation time and temperature) on properties of high-cycle fatigue and parameters of fatigue-crack growth of a welded joint of steel X20 CrM oV 12-1 ( X20). The eff ect of exploitation c onditions was analy sed by testing new pipe and the pipe having been exploited for 116 000 hours. The results obtained by testing and their analysis provide a practical contribution to assessment of quality of a welded joint of steel X20, the aim of which is r evitalisation and extension of exploitation life of vital c omponents of thermal po wer plants manufactured from high-alloy steel for operation at elevated temperatures.

In the area of Bosnia and Herzegovina there exist a significant number of oil terminals as a legacy of Federal direction of commodity reserves of the former Yugoslavia, which today is at disposal and usage to company Terminals of the Federation BH. Within those storages there is also TTT S-105 Ribic in Bihac. The paper presents an outline of the procedure selection and calculation of the general model of the multi-chamber tank of large volume, higher than 5.000[m 3 ], as a result of the reconstruction of the existing one-chamber tanks built 35 years ago, but destroyed due to war and not

The topic of this paper is the possibility of application of the laws of similarity in mechanics and experimental measuring conducted on the model of stationary multi-chamber cylindrical tank, during stress and strain condition analysis on actual tank (pressure vessel). The paper will present the results of the experimental strain measuring and stress estimation at critical points of the model of the vertical multi-chamber cylindrical tank with partitions, by experimental testing using cold water pressure, reduced 20 times in comparison to the actual tank. By using law of similarity in mechanics we will be able to, based on measured micro-strains, transfer calculated stress results from the model to the original, i.e. to the actual tank with estimated size of O 24.384[mm] x 11.010[mm], and 5.000[m 3 ]volume capacity.

In this paper, the effect of service temperature and life on high-cycle fatigue properties of base metal, steel X20 CrMoV 12-1, has been analysed. The effect of service conditions has been analysed by testing the new material and material that was in service for 116000 hours. The investigations have included determination of permanent fatigue strength at room and operating temperature. These investigations and their analysis should provide a practical contribution to assessment of behaviour of high alloy steel X20 under variable loading, thus ensuring safety in operation of the components in thermal power plants.