Прегледај по Аутор "Sovilj-Nikić, Sandra"

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    Analysis of tribological damages of plain bearings
    (IOP Publishing, 2019-09-17) Sovilj-Nikić, Sandra; Sovilj, Bogdan; Varga, Gyula; Antunović, Ranko; Ungureanu, Nicolae; GREBENIȘAN, Gavril; PELE, Alexandru-Viorel
    Tribological processes and failure of plain bearings significantly affect the availability, adaptability, reliability and productivity of modern technology, maintenance costs, energy costs and the costs of modern production. The research of tribological processes and failure of plain bearings should indicate the possible causes and the necessary measures to be applied in order to reduce the tribological processes and failure of plain bearings. In this paper, possible causes of tribological processes and failure of plain bearings were analyzed. Having in mind the most important causes of tribological processes and failure, a proposal for monitoring the condition is given.
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    INTEGRITY ASSESSMENT OF AN AIRCRAFT CYLINDER ASSEMBLY WITH A CRACK
    (Associated Publishers, 2022) Vučetić, Nikola; Jovičić, Gordana; Antunović, Ranko; Sovilj-Nikić, Sandra; Košarac, Aleksandar; Jeremić, Dejan
    The repeatability of the air-cooled piston engine cylinder assembly failure due to a crack in the cylinder head, as well as its severity from the aspect of crew and passenger safety were the main motives for our research. In this paper an integrity assessment of a cylinder assembly with a crack was performed. By modeling cracks of different lengths in the cylinder head and considering the values of stress intensity factors and J-integral values at a given crack length on the one hand and determining the critical values of these fracture mechanics parameters on the other hand, the stability of the crack was examined. As part of the research, the dependence of the crack length on the stress intensity factor was established. The methodology proposed in this paper can be adapted to assess the integrity of other similar structural elements
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    RESEARCH ABOUT POSSIBILITY FOR INCINERATION IN FLUIDISED BED OF WASTE MATERIALS PRODUCED BY PROCESSING OF USED LUBRICATING OILS
    (2018) Simić, Stojan; Kovač, Pavel; Sovilj-Nikić, Sandra; Kandeva, Mara; Kalitchin, Zhetcho; Ješić, Dušan; Golubović, Dušan
    In acid refining processes of used lubricating oil with sulphuric acid it is characteristic a creation of certain amount of waste which has to be disposed in an environmentally friendly way. Waste materials produced by acid refining process are: residue after the filtration process and resinousasphalt substance technically commonly named acid gudron. The paper presents the research results obtained in the experimental plant designed for the treatment of waste produced by refining of used lubricating oils sampled from the dump. With appropriate adjustment of process parameters, the results obtained during experimental tests in perspective would be a good basis for design of large capacity plants for treatment of waste materials such or similar physical and chemical characteristics