<p>U disertaciji je razvijena nova eksperimentalna postavka za merenje<br />graničnih uslova pri livenju u peščanim kalupima. Utvrđeno je da se<br />uvođenjem pojma prividne toplotne difuzivnosti materijala kalupa<br />može poništiti greška pozicioniranja termoparova i time smanjiti<br />greška procene graničnih uslova. Dodatno, pokazano je da proces<br />izdvajanja intermetalnih jedinjenja tokom procesa očvršćavanja<br />kalupa može uticati na vrednosti graničnih uslova. Razvijena je i<br />nova empirijska korelaciona funkcija kojom se može opisati promena<br />vrednosti koeficijenta prenosa toplote između kalupa i odlivka.</p> / <p>In this study a new experimental technique and apparatus for estimation of<br />boundary conditions in sand casting process were developed. It is shown<br />that thermocouple positioning errors can be nullified by introducing a concept<br />of apparent heat diffusivity of the mold material. In this way, total error of the<br />heat transfer estimation can be reduced. Additionally, it was found that the<br />process of precipitation of intermetallic compounds can influence the value of<br />achieved metal-mold heat transfer. A novel empirical correlation function is<br />proposed. This function has the ability to accurately describe the change in<br />interfacial heat transfer with the casting surface temperature.</p>
| Identifer | oai:union.ndltd.org:uns.ac.rs/oai:CRISUNS:(BISIS)95359 |
| Date | 01 October 2015 |
| Creators | Kovačević Lazar |
| Contributors | Kakaš Damir, Škorić Branko, Janjušević Zoran, Šiđanin Leposava, Vilotić Dragiša |
| Publisher | Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, University of Novi Sad, Faculty of Technical Sciences at Novi Sad |
| Source Sets | University of Novi Sad |
| Language | Serbian |
| Detected Language | English |
| Type | PhD thesis |
Page generated in 0.002 seconds