Машински факултет [Научни радови] / Faculty of Mechanical Engineering [Scientific papers]

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    (University Politehnica Timisoara, Faculty of Engineering Hunedoara, 2017) Kraišnik, Milija; Šljivić, Milan; Ilić, Jovica; Anić, Jelica
    Production methods based on additive manufacturing technologies represent a powerful approach to the rapid and efficient production of complex prototypes and functional parts from different materials. This paper presents the procedure of development and production of a holder using a fusing deposition modeling process. Since compression is the dominant load on the holder in exploitation, mechanical testing was carried out and the results obtained can contribute to adequate material selection.
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    (University Politehnica Timisoara, Faculty of Engineering Hunedoara, 2016) Vučinić, Radivojka; Srđan, Pelkic; Krstova, Keti; Đurić, Aleksija
    Through this work is shown the calculation procedure for the main energy characteristics of plant steam turbines working on the Clausius-Rankine cycle with reheating. The parameters that we are going to analyze are the level of usefulness ηPPT, specific heat consumption qPPT, total and specific steam consumption MTVPu, mPPT and the unit useful work LiTeq . This project was developed for maximum continuous power turbines of 235 MW, all the other parameters that were used in the calculation are listed in the the work. The aim of this research is to show the comprehensive budget mentioned turbines and making the schematic operation of the system with calculated characteristics, which could be used as a good basis for the design of thermal power plants.
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    (DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd, 2021) Milčić, Dragan; Mitić, Dragan; Radović, Nenad; Milčić, Miodrag; Đurić, Aleksija; Antić, Milica
    Postojeći standardi zahtevaju zavarene spojeve sa potpunom penetracijom. Smatra se, da se zavarenim spojevima sa potpunom penetracijom, minimizira koncentracija napona u korenskom prolazu. Međutim, brojne su situacije u industriji, u kojima je zadovoljavajuća nosivost zavarenog spoja sa delimičnom penetracijom. Ako ispitivanja zavarenih spojeva sa delimičnom penetracijom pokažu zadovoljavajuću nosivost, benefiti u odnosu na zavarene spojeve sa potpunom penetracijom se ogledaju u nižim troškovima, odnosno manje je potrebno vreme za pripremu spoja, manje je potrebno dodatnog materijala, odnosno kraće je vreme neophodno za izradu zavarenog spoja. U radu je dato ispitivanje sučeonih zavarivanih spojeva konstrukcionog čelika S355N, sa delimičnom penetracijom, ostvarenih MAG postupkom u nadglavnom položaju (PD) u zaštiti mešavine gasova. Uzorci su zavarivani sa različitim parametrima zavarivanja i sa različitom pripremom spoja – dubina spoja, a ispitivanja su vršena nedestruktivnim metodama (vizuelna kontrola, ispitivanje penetrantima i magnetnim česticama) i destruktivnim metodama –zatezanje, savijanje i tvrdoća.
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    WAAM and Other Unconventional Metal Additive Manufacturing Technologies
    (University of Novi Sad, Faculty of Technical Sciences Department of Production Engineering, 2020) Klobčar, Damjan; Baloš, Sebastian; Busić, Matija; Đurić, Aleksija; Lindič, Maja; Ščetinec, Aljaz; Milutinović, Mladomir
    The paper presents an overview of metal additive manufacturing technologies. The emphasis is on unconventional emerging technologies with firm background on welding technologies such as Ultrasonic Additive Manufacturing, Friction Additive Manufacturing, Thermal Spray Additive Manufacturing, Resistance Additive Manufacturing and Wire and Arc Additive Manufacturing. The particular processes are explained in detail and their advantages and drawbacks are presented. Attention is made on materials used, possibilities to produce multi-material products and functionally graded materials, and typical applications of currently developed technologies. The state-of-the-art on the Wire and Arc Additive Manufacturing is presented in more detail due to high research interests, it’s potential and widespread. The main differences between different arc additive manufacturing technologies are shown. An influence of processing parameters is discussed with respect to process stability and process control. The challenges related to path planning are shown together with the importance of post-processing. The main advantage of presented technologies is their ability of making larger and multi-material parts, with high deposition rate, which is difficult to achieve using conventional additive technologies.
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    Procjena bilansa emisije CO2 iz termoelektrana sa količinom apsorbovanog CO2 šumama u Republici Srpskoj
    (Faculty of Production and Management Trebinje, University of East Sarajevo, 2024-04-26) Vasković, Srđan; Tanić, Ljubiša; Adžić, Stefan; Jović, Borislav; Krunić, Gojko; Spaić, Obrad
    This paper deals with the comparison of the amount of carbon dioxide emitted from thermal power plants in the Republic of Srpska with the amount of CO2 absorbed in the process of photosynthesis through existing wood stocks in forests and the achieved wood growth of forests in the territory of the Republic of Srpska. Since CO2 by definition has a negative impact on the climate on planet Earth and due to the fact that it causes the greenhouse effect, additional warming of our planet occurs. There are generally two procedures for estimating and determining CO2 emissions from thermal power plants: based on previously defined mathematical models and measured coal consumption. The measurement methods used for taking samples are: nonextractive (measuring probes and devices are located inside or in the smoke duct) and extractive (the sample is taken from the smoke duct and taken to the device where it is analyzed). Sensors based on which the composition is determined are divided into: electrolytic, optical, calorimetric and photometric. The calculated and predicted emissions from the existing thermal power plants in the Republic of Srpska were compared with the equivalent of CO2 storage in the forest biomass that the Republic of Srpska has at its disposal, from which were derived very interesting parts of the conclusions regarding the CO2 neutrality of the energy sector related to the thermal power plants of the Republic of Srpska.