TY  - JOUR
AU  - Drobnjak, Radmila
AU  - Radović-Stojanović, Jelena   
AU  - Drobnjak, Predrag
AU  - Nešić, Ivan
PY  - 2000
UR  - http://jakov.kpu.edu.rs/handle/123456789/14
AB  - One of the biggest problems in the process of casting, is how to determine the distribution of temperature, taking into consideration the effects of several mechanisms of heat exchange. The experimental methods being rather expensive and complicated, the numerical methods are nowadays applied largely. Differential equations of heat conduction are derived according to the basic laws of continuum mechanics, taking into account the phase changes during the casting. The equations obtained are solved by the method of finite elements. In this way, a new scientific discipline is established within the scope of continuum mechanics. As an application of the described procedure, the temperature fields in the casting process of alloyed casting are determined.
AB  - Jedan od najsloženijih problema pri livenju je kako i na koji način da se odredi raspodela temperature, obzirom na dejstvo više mehanizama razmene toplote. Kako su eksperimentalne metode dosta skupe i složene, u novije vreme veliku primenu imaju numeričke metode. Polazeći od osnovnih zakona mehanike kontinuuma definisane su diferencijalne jednačine provođenja toplote, uzimajući u obzir fazne promene pri livenju. Dobijene jednačine su rešavane metodom konačnih elemenata. Time je ustanovljena nova naučna disciplina u okviru mehanike kontinuuma. Kao primena opisane procedure određena su temperaturna polja u toku procesa livenja legiranog liva.
PB  - Beograd : Kriminalističko- policijska akademija
T2  - Nauka, bezbednost, policija
T1  - Application of the method of finite elements to the simulation of casting process
T1  - Primena metode konačnih elemenata na simulaciju procesa livenja
VL  - 5
IS  - 1
SP  - 143
EP  - 167
UR  - https://hdl.handle.net/21.15107/rcub_jakov_14
ER  - 

@article{
author = "Drobnjak, Radmila and Radović-Stojanović, Jelena    and Drobnjak, Predrag and Nešić, Ivan",
year = "2000",
abstract = "One of the biggest problems in the process of casting, is how to determine the distribution of temperature, taking into consideration the effects of several mechanisms of heat exchange. The experimental methods being rather expensive and complicated, the numerical methods are nowadays applied largely. Differential equations of heat conduction are derived according to the basic laws of continuum mechanics, taking into account the phase changes during the casting. The equations obtained are solved by the method of finite elements. In this way, a new scientific discipline is established within the scope of continuum mechanics. As an application of the described procedure, the temperature fields in the casting process of alloyed casting are determined., Jedan od najsloženijih problema pri livenju je kako i na koji način da se odredi raspodela temperature, obzirom na dejstvo više mehanizama razmene toplote. Kako su eksperimentalne metode dosta skupe i složene, u novije vreme veliku primenu imaju numeričke metode. Polazeći od osnovnih zakona mehanike kontinuuma definisane su diferencijalne jednačine provođenja toplote, uzimajući u obzir fazne promene pri livenju. Dobijene jednačine su rešavane metodom konačnih elemenata. Time je ustanovljena nova naučna disciplina u okviru mehanike kontinuuma. Kao primena opisane procedure određena su temperaturna polja u toku procesa livenja legiranog liva.",
publisher = "Beograd : Kriminalističko- policijska akademija",
journal = "Nauka, bezbednost, policija",
title = "Application of the method of finite elements to the simulation of casting process, Primena metode konačnih elemenata na simulaciju procesa livenja",
volume = "5",
number = "1",
pages = "143-167",
url = "https://hdl.handle.net/21.15107/rcub_jakov_14"
}

Drobnjak, R., Radović-Stojanović, J., Drobnjak, P.,& Nešić, I.. (2000). Application of the method of finite elements to the simulation of casting process. in Nauka, bezbednost, policija
Beograd : Kriminalističko- policijska akademija., 5(1), 143-167.
https://hdl.handle.net/21.15107/rcub_jakov_14

Drobnjak R, Radović-Stojanović J, Drobnjak P, Nešić I. Application of the method of finite elements to the simulation of casting process. in Nauka, bezbednost, policija. 2000;5(1):143-167.
https://hdl.handle.net/21.15107/rcub_jakov_14 .

Drobnjak, Radmila, Radović-Stojanović, Jelena   , Drobnjak, Predrag, Nešić, Ivan, "Application of the method of finite elements to the simulation of casting process" in Nauka, bezbednost, policija, 5, no. 1 (2000):143-167,
https://hdl.handle.net/21.15107/rcub_jakov_14 .

TY  - JOUR
AU  - Kerečki, Radoslav
AU  - Radovanović, Radovan
AU  - Drobnjak, Radmila
AU  - Jotić, Dragana
PY  - 1997
UR  - http://jakov.kpu.edu.rs/handle/123456789/6
AB  - Compared to the low-carbon and low-alloyed constructive steels, application of high strengthened steels has significant advantages. Those advantages are contained in reducing the mass of construction, increasing the carrying capacity and working period, increasing the anti-corrosive protection and attaining the good properties of welded joint. But it is not that easy to accomplish these characteristics in high strengthened micro-alloyed steels because of following difficulties:- increase of strength is usually followed by decrease of plasticity,- increase of strength causes decrease of impact toughness, which increases tendency to brittle fracture,- increase of strength steels decreases the ratio between yield limit and tensile strength, which leads to decreasing of dependability of welded assembly. The purpose of this paper was to determine optimum regime of thermo-mechanical treatment for certain amount of input heat during welding, what should contribute in achievement of quality appliance of welded assembly. The tested material was high strengthened micro-alloyed steel with all its properties, such as resistance and deformation, toughness, macroscopic, microscopic and submicroscopic changes in material.
AB  - Primena čelika visoke čvrstoće ima znatne prednosti u odnosu na obične niskougljenične i niskolegirane konstrukcione čelike. Prednosti se ogledaju u smanjenju mase konstrukcije, povećanju nosivosti i veka trajanja, povećanju antikorozivne zaštite i postizanju dobrih karakteristika zavarenog spoja. Međutim, postizanje navedenih svojstava kod mikrolegiranih čelika visoke čvrstoće nije tako jednostavno zato što: - povećanje čvrstoće obično prati smanjenje plastičnosti; - povećanje čvrstoće izaziva smanjenje udarne žilavosti, a time i povećanje sklonosti ka krtom lomu; - sa povećanjem čvrstoće čelika smanjuje se odnos granice tečenja i zatezne čvrstoće, što dovodi do smanjenja pouzdanosti zavarene konstrukcije. Cilj ovoga rada je bio da se na mikrolegiranom čeliku visoke čvrstoće na osnovu ispitivanja svojstava otpornosti i deformacije, karakteristika žilavosti, praćenja makroskopskih, mikroskopskih i submikroskopskih promena u materijalu utvrdi optimalni režim termomehaničke obrade za određenu količinu unesene toplote pri zavarivanju, što bi doprinelo da se postigne odgovarajući kvalitet za primenu zavarene konstrukcije.
PB  - Beograd : Kriminalističko- policijska akademija
T2  - Nauka, bezbednost, policija
T1  - Analysis of the amount of input heat during welding and its influence on structure and toughness of high strengthened micro-alloyed steels
T1  - Analiza unesene količine toplote pri zavarivanju i njen uticaj na strukturu i žilavost mikrolegiranih čelika povišene čvrstoće
VL  - 2
IS  - 2
SP  - 69
EP  - 76
UR  - https://hdl.handle.net/21.15107/rcub_jakov_6
ER  - 

@article{
author = "Kerečki, Radoslav and Radovanović, Radovan and Drobnjak, Radmila and Jotić, Dragana",
year = "1997",
abstract = "Compared to the low-carbon and low-alloyed constructive steels, application of high strengthened steels has significant advantages. Those advantages are contained in reducing the mass of construction, increasing the carrying capacity and working period, increasing the anti-corrosive protection and attaining the good properties of welded joint. But it is not that easy to accomplish these characteristics in high strengthened micro-alloyed steels because of following difficulties:- increase of strength is usually followed by decrease of plasticity,- increase of strength causes decrease of impact toughness, which increases tendency to brittle fracture,- increase of strength steels decreases the ratio between yield limit and tensile strength, which leads to decreasing of dependability of welded assembly. The purpose of this paper was to determine optimum regime of thermo-mechanical treatment for certain amount of input heat during welding, what should contribute in achievement of quality appliance of welded assembly. The tested material was high strengthened micro-alloyed steel with all its properties, such as resistance and deformation, toughness, macroscopic, microscopic and submicroscopic changes in material., Primena čelika visoke čvrstoće ima znatne prednosti u odnosu na obične niskougljenične i niskolegirane konstrukcione čelike. Prednosti se ogledaju u smanjenju mase konstrukcije, povećanju nosivosti i veka trajanja, povećanju antikorozivne zaštite i postizanju dobrih karakteristika zavarenog spoja. Međutim, postizanje navedenih svojstava kod mikrolegiranih čelika visoke čvrstoće nije tako jednostavno zato što: - povećanje čvrstoće obično prati smanjenje plastičnosti; - povećanje čvrstoće izaziva smanjenje udarne žilavosti, a time i povećanje sklonosti ka krtom lomu; - sa povećanjem čvrstoće čelika smanjuje se odnos granice tečenja i zatezne čvrstoće, što dovodi do smanjenja pouzdanosti zavarene konstrukcije. Cilj ovoga rada je bio da se na mikrolegiranom čeliku visoke čvrstoće na osnovu ispitivanja svojstava otpornosti i deformacije, karakteristika žilavosti, praćenja makroskopskih, mikroskopskih i submikroskopskih promena u materijalu utvrdi optimalni režim termomehaničke obrade za određenu količinu unesene toplote pri zavarivanju, što bi doprinelo da se postigne odgovarajući kvalitet za primenu zavarene konstrukcije.",
publisher = "Beograd : Kriminalističko- policijska akademija",
journal = "Nauka, bezbednost, policija",
title = "Analysis of the amount of input heat during welding and its influence on structure and toughness of high strengthened micro-alloyed steels, Analiza unesene količine toplote pri zavarivanju i njen uticaj na strukturu i žilavost mikrolegiranih čelika povišene čvrstoće",
volume = "2",
number = "2",
pages = "69-76",
url = "https://hdl.handle.net/21.15107/rcub_jakov_6"
}

Kerečki, R., Radovanović, R., Drobnjak, R.,& Jotić, D.. (1997). Analysis of the amount of input heat during welding and its influence on structure and toughness of high strengthened micro-alloyed steels. in Nauka, bezbednost, policija
Beograd : Kriminalističko- policijska akademija., 2(2), 69-76.
https://hdl.handle.net/21.15107/rcub_jakov_6

Kerečki R, Radovanović R, Drobnjak R, Jotić D. Analysis of the amount of input heat during welding and its influence on structure and toughness of high strengthened micro-alloyed steels. in Nauka, bezbednost, policija. 1997;2(2):69-76.
https://hdl.handle.net/21.15107/rcub_jakov_6 .

Kerečki, Radoslav, Radovanović, Radovan, Drobnjak, Radmila, Jotić, Dragana, "Analysis of the amount of input heat during welding and its influence on structure and toughness of high strengthened micro-alloyed steels" in Nauka, bezbednost, policija, 2, no. 2 (1997):69-76,
https://hdl.handle.net/21.15107/rcub_jakov_6 .