Прегледај по Аутор "Milutinović, Mladomir"
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- СтавкаCharacterization of Microstructural Damage and Failure Mechanisms in C45E Structural Steel under Compressive Load(MDPI, 2022) Kraišnik, Milija; Čep, Robert; Kourˇil, Karel; Baloš, Sebastian; Antić, Aco; Milutinović, MladomirIn this paper, the microstructural damage evolution of a steel with a ferrite–pearlite microstructure (C45E) was investigated during the process of cold upsetting. The development and the accumulation of microstructural damage were analyzed in different areas of samples that were deformed at different strain levels. The scanning electron microscopy (SEM) results showed that various mechanisms of nucleation of microcavities occurred during the upsetting process. In quantitative terms, microcavities were predominantly generated in pearlite colonies due to the fracture of cementite lamellae. In addition, the mechanism of decohesion had a significant influence on the development of a macroscopic crack, since a high level of microcracks, especially at higher degrees of deformation, was observed at the ferrite/pearlite or ferrite/ferrite interfaces. It was found that the distribution of microcavities along the equatorial plane of the sample was not uniform, as the density of microcavities increased with increasing strain level. The influence of stress state, i.e., stress triaxiality, on the nucleation and distribution of microcracks, was also analyzed.
- СтавкаIndustry 4.0 and New Paradigms in the Field of Metal Forming(University North, 2021) Milutinović, Mladomir; Milošević, Mijodrag; Ilić, Jovica; Movrin, Dejan; Kraišnik, Milija; Ranđelović, Saša; Lukić, DejanOver the last few year, the metalworking sector has been undergoing rapid and radical transformations driven by global competition and the revision of the production focus that is being moved from mass customization to mass individualization. A results of this is introduction of new manufacturing strategies such as Industry 4.0, a concept that combines cyber-physical systems and promote communication and connectivity. Therefore, this concept changes not only the face of the manufacturing systems but also causes transformation of existing business models and the society as a whole. This paper deals with the recent trends and paradigms in the field of metal forming, resulting from the concept of Industry 4.0 and the modern market challenges. The maim attention is paid on the flexibility of manufacturing systems and recent developments in design of smart forming tools.
- 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.
- 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.
- СтавкаWAAM 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, MladomirThe 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.