Машински факултет [Научни радови] / Faculty of Mechanical Engineering [Scientific papers]
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Прегледај Машински факултет [Научни радови] / Faculty of Mechanical Engineering [Scientific papers] по Аутор "Anić, Jelica"
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- СтавкаAPPLICATION POTENTIAL OF SOME CRITERIA OF DUCTILE CRACK IN BULK FORMING PROCESSES(University POLITEHNICA Timisoara, 2016) Kraišnik, Milija; Vilotić, Dragiša; Šiđanin, Leposava; Stefanović, Milentije; Anić, JelicaDuctile 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.
- СтавкаCOMPRESSIVE PROPERTIES OF COMMONLY USED POLYMERS IN ADDITIVE MANUFACTURING PROCESSES(University Politehnica Timisoara, Faculty of Engineering Hunedoara, 2017) Kraišnik, Milija; Šljivić, Milan; Ilić, Jovica; Anić, JelicaProduction 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.
- СтавкаIndustry 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, GeorgiA 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.
- СтавкаMATERIAL 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, MirkoMaterial 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.
- СтавкаPolymers 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, JelicaThis 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.
- СтавкаSOME 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, BiljanaThe 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.
- СтавкаTHE CURRENT STATE OF ART ON MICROFORMING(University Politehnica Timisoara, Faculty of Engineering Hunedoara, 2024-02) Anić, Jelica; Milutinović, Mladomir; Kraišnik, Milija; Moljević, Slaviša; Kiss, ImreThe growing utilization of micro parts in various industries has resulted in a notable upsurge in micro production. This trend is especially prominent in sectors such as automotive, aerospace, electronic component manufacturing, and medical device production. This paper gives an overview of researches conducted in certain areas of microforming, including micro deep drawing, micro hydroforming, micro incremental sheet forming, micro extrusion, micro bending, and micro tensile testing.