Author(s):
1. Sadoon Ayed, Faculty of Mechanical Engineering in Niš, Serbia
2. Milos Jovanovic, Faculty of Mechanical Engineering in Niš, Serbia
3. Gradimir Ilić, Faculty of Mechanical Engineering in Niš, Serbia
4. Predrag Živković, Faculty of Mechanical Engineering in Niš, Serbia
5. Mića Vukić , Faculty of Mechanical Engineering in Niš, Serbia
6. Mirko Dobranjac, University of Banja Luka, Faculty of mechanical engineering,
Republic of Srpska, Bosnia and Herzegovina
7. Suzana Klječanin, The Public Institution Institute for materials and construction testing of Republic of Srpska,
Republic of Srpska, Bosnia and Herzegovina