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On the other hand, the behavior of the specimen with shallow crack is dictated by the overmatch region ahead the crack tip and depends very little on the weld slenderness.

Abstract The purpose of this paper is to analyze how the Engineering Project Organization Society (EPOS) has addressed the issue of megaprojects at their annual conferences organized from 2006 to 2016. The literature analysis used in this paper is a form of content analysis. It focuses on the usage of a particular term in scientific papers. In this case, the key term is “megaprojects” or “mega-projects”. Papers in which this term appears are selected for further analysis. The findings show that the main keyword “megaproject” or “mega-project” appears 22 times in the identified papers. It appears in 10 titles and nine abstracts. Most important for this literature analysis, it appears in seven lists of keywords. Literature analysis proceeded by analyzing the associated keywords in the seven papers in which the main keyword “megaproject” or “mega-projects” can be found in the listed keywords. The analysis shows that the main associated keywords are “governance”, “complexity”, and “trust”. This research provides a view of the collective understanding of megaprojects within the EPOS community and helps to shape further research in this field. In addition, the results of this research can be seen as a step forward for scholars and practitioners to discuss and develop a new theoret­ical framework for better understanding of megaproject governance.

Professional paperThe device used to shake off the ash of the steam boiler harp consists of a drive shaft which has radial carriers welded on. During the operation of the waste incinerator steam boiler in Riverside, a fracture of the radial carrier and drive shaft weld occurred. Such a welded T-joint is made as a double fillet weld. It is loaded with the impact loading which causes the fatigue of material because of its repetition. The analytical calculation, with which the loadbearing capacity of the welded joint is determined, is suggested in this paper. The suggested analytical calculation of the mean impact force is based on the law of momentum conservation during the collision of rapping device and elastically deformable heat exchanger harp. The mean impact force is applied for the weld strength calculation. The results showed that the use of double fillet weld loaded with the fatigue impact loading was a bad choice. The suggested analytical calculation model is applicable for the rapping device design. Keywords: double fillet weld; fatigue; impact loading; rapping device; strength Utjecaj udarnog zamornog opterećenja na čvrstoću kutnog zavarenog spoja radijalnog nosača i pogonskog vratila udaračaStručni članak Uređaj za stresanje pepela s izmjenjivačkih harfi parnog kotla sastoji se od pogonskog vratila na koje su zavareni radijalni nosači čekića. U radu parnog kotla spalionice smeća u Riverside-u došlo je do loma zavarenog spoja radijalnog nosača i pogonskog vratila udarača. Zavareni spoj radijalnog nosača i vratila izveden je kao obostrani kutni zavareni spoj. Ovaj zavareni spoj opterećen je udarnim opterećenjem koje zbog ponavljajućeg karaktera prouzrokuje zamor materijala. U radu je predložen analitički proračun kojim je utvrđena nosivost zavarenog spoja. Predloženi analitički proračun srednje sile sudara temelji se na zakonu očuvanja količine gibanja uslijed sudara čekića udarača i elastično deformabilne harfe izmjenjivača topline. Srednja sila sudara primjenjuje se kod proračuna čvrstoće zavarenog spoja. Dobiveni rezultati pokazali su da je primjena kutnog zavarenog spoja opterećenog udarnim zamornim opterećenjem loš izbor. Predloženi model analitičkog proračuna moguće je primijeniti kod dizajna udarača.