Faculty of Mechanical and Civil Engineering, Kraljevo

Permanent URI for this collectionhttps://dspace.unic.kg.ac.rs/handle/123456789/8211

Browse

Browsing Faculty of Mechanical and Civil Engineering, Kraljevo by Subject "Additive manufacturing"

Filter results by typing the first few letters
Now showing 1 - 4 of 4
  • Thumbnail Image
    Item
    Advantages and Drawbacks of Additive Manufacturing
    (Faculty of Mechanical and Civil Engineering, 2017) Vranić, Aleksandar; Bogojevic, Nebojsa; Ćirić Kostić, Snežana; Croccolo, D.; Olmi, G.
    - This paper presents some various imperfections that can occur during Direct Metal Laser Sintering (DMLS) and their effects on part quality. Direct Metal Laser Sintering is one of the Additive Manufacturing (AM) technologies that enables fast production of an accurate, functional, complex shape parts and tools, without additional tooling, directly from 3D CAD model. This process is based on layer by layer manufacturing, where the fusion of the metal powder is performed by selective melting with laser beam. The laser beam moves and scans area that correspond to section of the part for the specific layer. In the DMLS the part is built layer by layer, where the process of the melting and solidification occur in small volume in relatively short time. Thanks to this kind of approach, the DMLS has much less limitations than the subtractive methods of part production. However, the production in the layers has some drawbacks, which can have a significantly influence on the part geometry, structural errors and part imperfections. Some of the advantages as well and drawback of the DMLS of metal parts has been presented in this paper.
  • Thumbnail Image
    Item
    Effects of Machining on the Fatigue Strength of Steel Components Produced by DMLS
    (2021) Ćirić Kostić, Snežana; Bogojevic, Nebojsa; Croccolo, D.; Olmi, G.; Sinđelić, V.; Šoškić, Zlatan
    Direct metal laser sintering (DMLS) is the additive manufacturing (AM) technology that allows production of metal machine components with complex geometry. Due to the layer-wise production principle, its products usually require post-processing, predominantly machining, to achieve uniform or requested surface quality. Given the increasing application of DMLS technology in industry and insufficient published data about the effects of machining on the fatigue properties of steel, the focus of this research is put to investigation of the influence of thickness of allowance for machining to fatigue strength of DMLS products. Previous studies revealed significant differences in the mechanical behaviour of samples made of different kinds of steels, both during production and testing. Unlike the samples made from maraging steel, the samples made from stainless steel often deformed during cooling due to the strong residual stresses, and revealed dependence of mechanical properties on orientation during production process. To improve the understanding of the differences, fatigue testing according to ISO 1143 was performed on samples manufactured from two kinds of steel, maraging steel 1.2709 and stainless steel 15-5. Twelve sets of samples were tested with the aim to investigate the effects of machining allowance and build orientation according to an extensive DoE experimental plan.
  • Thumbnail Image
    Item
    A Heuristic Approach to the Estimation of the Mass of the Waste Powder During Selective Laser Sintering of Polyamide PA2200, Proceedings of IX International Conference “Heavy Machinery-HM 2017"
    (Faculty of Mechanical and Civil Engineering, 2017) Šoškić, Zlatan; Montanari, Simona; Monti, Gian Luca; Monti, Michele
  • Thumbnail Image
    Item
    Investigation of mixed mode I and II fracture mechanical behaviour of SLS printed IASCB specimens by digital image correlation
    (2019) Campione, Ivo; Brugo, Tommaso Maria; Minak, Giangiacomo; Kos, Josip; Janković Tomić, Jelena; Ćirić Kostić, Snežana
    This work focuses on the fracture mechanics properties of polyamide (PA) for selective laser sintering (SLS) and investigates the capability of additive manufacturing process to build 3D artificial cracks, otherwise impossible to create by classic methods. IASCB semi-circular specimen with tilted crack subjected to asymmetric three-point bend loading were tested in order to cover a wide range of stress intensity factors (KI, KII and mixed modes) and T-stress. Moreover, Digital Image correlation (DIC) technique was used by full strain field analysis with the purpose of evaluating the fracture behaviour
Faculty of Mechanical and Civil Engineering in Kraljevo