Прегледај по Аутор "Anić, Jelica"

Сада се приказује 1 - 12 од 12
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    APPLICATION POTENTIAL OF SOME CRITERIA OF DUCTILE CRACK IN BULK FORMING PROCESSES
    (University POLITEHNICA Timisoara, 2016) Kraišnik, Milija; Vilotić, Dragiša; Šiđanin, Leposava; Stefanović, Milentije; Anić, Jelica
    Ductile crack criteria are unavoidable tool for material formability analysis. Their basic task is foreseeing the location of crack occurrence and critical value of deformation level in the course of forming process. However, in order to provide successful application of certain criterion it is necessary to be familiar with material characteristics, specificities of forming processes and forming conditions. For all the above mentioned reasons this paper deals with the analysis of application potential of some widely used criteria of ductile crack in cold bulk forming processes according to representative literature resources. Results can contribute better understanding of phenomenon of material microstructure damage and adequate choice of ductile crack criterion in the analysis of formability in various processes and forming conditions.
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    COMPARING THE ACCURACY OF MASTER MODEL AND THEIR REPLICAS PRODUCED BY RAPID TOOLING USING VACUUM CASTING
    (Mašinski fakultet, Univerzitet u Banjoj Luci, 2019) Kraišnik, Milija; Ilić, Jovica; Jotić, Goran; Mačkić, Tihomir; Anić, Jelica; Gvero, Petar; Prochaska, Biljana
    In this paper we compared the accuracy of an original master model which was used to make the silicone mold and mold cavity and its replicas obtained by the vacuum casting technology. This technology allows us to create small batches of parts based on the master model in a relatively short time. The aim of the paper is to compare the accuracy of replicas produced with the OEM part using a reversible engineering technique, that is, CAD to part.
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    COMPRESSIVE PROPERTIES OF COMMONLY USED POLYMERS IN ADDITIVE MANUFACTURING PROCESSES
    (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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    DEVELOPMENT OF SMALL BATCHES OF FUNCTIONAL PARTS USING INTEGRATION OF 3D PRINTING AND VACUUM CASTING TECHNOLOGY
    (University of Banja Luka, Faculty of Mechanical Engineering, 2017) Šljivić, Milan; Kraišnik, Milija; Ilić, Jovica; Anić, Jelica
    In conditions of dynamic market environment there is an increasing requirement for rapid development and production of complex and functional parts from different materials. In this paper, we present the process of development and production of small batches of functional parts in the integrated system of additive and vacuum casting technology. All advantages of this integrated approach were used during the research. Data obtained from the manufacturer were used for the proper selection of materials and they relate to the value of mechanical characteristics.
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    FABRICATION OF SMALL BATCHES OF FUNCTIONAL AND AUTHENTIC PARTS FOR OLD-TIMERS USING INTEGRATION OF MATERIAL EXTRUSION AND VACUUM CASTING TECHNOLOGIES
    (Department of Mechanical Engineering, Aristotle University of Thessaloniki, Greece, 2017) Kraišnik, Milija; Šljivić, Milan; Ilić, Jovica; Anić, Jelica
    This paper focuses on production of small series of functional parts for old timers, for which it is very difficult and in some cases impossible to find spare parts. Specifically, the paper presents the possibilities of designing and making authentic parts with special requirements of the owner or the collector of old timers. As a result of this study, a small series of authentic parts and replicas based on the existing functional parts of the oldtimers was designed and fabricated. The results of experimental studies have highlighted the advantages of production that is based on the integration of technology of material extrusion and vacuum casting, especially for small series of complex and specific products.
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    Industry 4.0 and Multi-tasking machining
    (SCIENTIFIC TECHNICAL UNION OF MECHANICAL ENGINEERING “INDUSTRY 4.0”, 2023) Sekulić, Milenko; Savković, Borislav; Aleksić, Anđelko; Košarac, Aleksandar; Moljević, Slaviša; Anić, Jelica; Popov, Georgi
    A clear trend of Industry 4.0 and smart manufacturing is to promote the increased use of multi-tasking machine tools. These machines are easily integrated into digital production systems and enable real-time data acquisition, remote monitoring and adaptive cutting processing. The integration of multi-tasking machine tools and digital manufacturing systems will improve the implementation of predictive maintenance, process optimization and production efficiency. Moreover, the development of robotics and AI along with the adoption of Industry 4.0 will increase the market share of these machine tools. The market demand is expected to increase further due to the rise of Industry 4.0. The paper analyzes the main advantages of multi-tasking machining, focusing on the advanced features of multi-tasking machine tools, as well as the latest trend of integrating additive manufacturing processes with CNC machining.
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    LAYER THICKNESS INFLUENCE OF MACRO- AND MICROSTRUCTURE QUALITY OF 3D PRINTED PARTS
    (Faculty of Engineering, University of Kragujevac, 2019) Đurić, Aleksija; Gojković, Ranka; Marković, Biljana; Moljević, Slaviša; Anić, Jelica
    In this paper will be analyzed the influence of the layer thickness on the micro and macro structure of the parts obtained by 3D printing, i.e. fused filament fabrication (FFF) technology. Specimens for analysis will be printed on the 3D printer Zotrax M 200, and the macro and microstructure will be done on the VHX 6000 microscope. It will be shown in the paper that by increasing the thickness of the layer, the time required for the production of the part will be significantly reduced, but also the quality of the surface is also significantly affected.
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    MATERIAL FORMABILITY AT BULK METAL FORMING, CRITERIA, METHOD OF DETERMINATION AND APPLICATION
    (UNIVERRSITY POLITEHNICA TIMISOARA, FACULTY OF ENGINEERING HUNEDOARA, 2019) Vilotić, Dragiša; Kraišnik, Milija; Milutinović, Mladomir; Movrin, Dejan; Vilotić, Marko; Anić, Jelica; Ficko, Mirko
    Material formability it is material ability to deform permanently in different stress condition without structure damage. The fracture limit of material in bulk metal forming is based on fracture and formability criteria. In metal forming, two formability criteria and two workability diagrams are being used: a) the strain based and b) stress based formability diagram. Strain based formability diagram represents the dependence of the principal strains on the free surface of specimen at the moment of the fracture occurrence. The stress based formability diagram represents the relation between limit strain and stress triaxiality ratio in the zone of fracture. In this paper, methodology of formability diagrams determination is presented and application of formability diagram for the limit strain prediction in multi-stage upsetting of prismatic specimen by V-shape dies is performed.
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    Polymers in Additive Manufacturing: the Case of a Water Pump Impeller
    (Faculty of Mechanical Engineering, Belgrade University, 2017) Pavlović, Ana; Šljivić, Milan; Kraišnik, Milija; Ilić, Jovica; Anić, Jelica
    This research aimed at evaluating which of the polymers commonly used for rapid prototyping in the process of additive manufacturing can also meet the functional requirements in the preparation of final parts. In particular, the investigation was focused on a water pump impeller as a practical case study. A comparison between mechanical properties was proposed for this scope. ABSplus, ABS and PLA polymers were considered. Materials were tested in tensile and bending conditions. Results showed that ABSplus and ABS polymers satisfy all the mechanical requirements, while PLA fails. Then, the impellers were built-in and tested. All functional requirements, together with the necessary stability were verified. In this way, it was proved that, by selecting a suitable polymer, additive manufacturing can be successfully used to produce complex final elements, thus leading to extremely fast production, high accuracy and precision and even lower costs compared to other conventional technologies.
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    Procjena radnog stanja kotrljajnih ležajeva uz softversku podršku
    (Elektrotehnički fakultet, Univerzitet u Istočnom Sarajevu, 2015) Marković, Biljana; Anić, Jelica; Košarac, Aleksandar
    Ležajevi su mašinski elementi čiji je zadatak da omoguće relativno kretanje obrtnih dijelova uz istovremeno prenošenje opterećenja između njih i obezbjeđenje tačnosti njihovog položaja. Mogućnosti otkaza ovog elementa su veoma velike, a s obzirom na visok procenat prevremeno uništenih ležajeva, razvijene su brojne metode za detekciju, ne samo oštećenog stanja kotrljajnog ležaja, već i za identifikaciju tipa otkaza ležaja. Jedna od metoda za detekciju je vibrodijagnostika. U ovom radu prikazana je primjena savremenih vibrodijagnostičkih metoda za utvrđivanje stanja ispravnosti kotrljajnih ležajeva, sa ciljem prediktivnog održavanja tehničkih sistema, uz podršku softvera za analizu rezultata ispitivanja.
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    SOME ASPECTS OF DEVELOPMENT OF DUCTILE CRACK IN THE PROCESS OF COLD BULK FORMING
    (Faculty of Engineering Hunedoara, University POLITEHNICA Timisoara, 2017) Kraišnik, Milija; Šljivić, Milan; Anić, Jelica; Ilić, Jovica; Mijatović, Biljana
    The main limiting factor in increasing the productivity of the process of cold bulk metal forming is the appearance of plastic fracture. However, proper design of a technological process can greatly increase formability of the material. For those activities it is necessary to fully understand all the factors that affect constituent stages of development and the appearance of macroscopic damage on metal components. Therefore, based on the available literature resources and our own research, the impact of the most dominant factors on accumulation of critical damage of microstructure in cold bulk metal forming processes with special reference to the impact of stress state was analyzed in this paper.
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    SOME ASPECTS OF DEVELOPMENT OF PLASTIC FRACTURE IN THE PROCESS OF COLD BULK FORMING
    (Technical faculty “Mihajlo Pupin” Zrenjanin, University of Novi Sad, 2016) Kraišnik, Milija; Šljivić, Milan; Anić, Jelica; Ilić, Jovica
    The main limiting factor in increasing the productivity of the process of cold bulk metal forming is the appearance of plastic fracture. However, proper design of a technological process can greatly increase formability of the material. For those activities it is necessary to fully understand all the factors that affect constituent stages of development and the appearance of macroscopic damage on metal components. Therefore, based on the available literature resources and our own research, the impact of the most dominant factors on accumulation of critical damage of microstructure in cold bulk metal forming processes with special reference to the impact of stress state was analyzed in this paper.