Прегледај по Аутор "Krstić, Branimir"

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    Further Investigation of the Repetitive Failure in an Aircraft Engine Cylinder Head - Mechanical properties of Aluminum alloy 242.0
    (2020) Vučetić, Nikola; Jovičić, Gordana; Krstić, Branimir; Živković, Miroslav; Milovanović, Vladimir; Kačmarčik, Josip; Antunović, Ranko
    Aluminum alloys are widely used in military and aviation industry due to their properties such as low density and high strength. During the aircraft operation there are mechanical failures of various structural components caused by numerous mechanisms such as corrosion, material defects, high cycle fatigue and the like. One of the frequent mechanical failures on air-cooled piston engines is the cylinder head cracking. This paper is the continuation a comprehensive research of the Lycoming IO-360-B1F aircraft cylinder head failure. The failure of this type has already occurred during flight and about 50 failures like this have been registered from around the world, some of them with a fatal outcome and therefore require detailed research. The paper consists of machining of the tested specimens and their testing at many different locations and in many different laboratories throughout Bosnia and Herzegovina, Serbia and Slovenia. This paper is based on a research that includes the experimental analysis of mechanical properties of Aluminum alloy 242.0 which is a constituent material of the cylinder head of the Lycoming IO-360-B1F aircraft engine on which a crack appeared. Based on chemical, metallographic, static and dynamic experimental tests of the material properties, Aluminum alloy 242.0 static and fatigue properties were obtained, S-N curve was formed and endurance limit was determined. Results of numerical simulations of experiments, confirmed by experimental results, were performed to make numerical procedures reliable due to further research. The results of the research are planned to be implemented in numerical modeling of the cylinder assembly stress-strain state under workload and in further numerical research of Lycoming IO-360-B1F cylinder assembly integrity assessment.
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    ISPITIVANJE ZAMORNIH KARAKTERISTIKA LEGURE ALUMINIJUMA 242.0 S CILJEM PROCJENE INTEGRITETA AVIONSKOG CILIDARSKOG SKLOPA SA PRSLINOM
    (Mašinski fakultet Istočno Sarajevo, Univerzitet u Istočnom Sarajevu, 2022) Vučetić, Nikola; Jovičić, Gordana; Antunović, Ranko; Milovanović, Vladimir; Krstić, Branimir; Jeremić, Dejan; Golubović, Dušan; Milutinović, Miroslav; Prodanović, Saša
    U cilju procjene integriteta cilindarskog sklopa avionskog motora Lycoming IO-360-B1F usljed pojave prsline na glavi cilindra potrebno je izvršiti niz eksperimentalnih ispitivanja legure aluminijuma 242.0 kao sastavnog materijala glave cilindra, među kojima je ispitivanje zamornih karakteristika na sobnoj i na povišenoj temperaturi. Dobijeni rezultati korišćeni su kao ulazni podaci u numeričkoj strukturnoj analizi razmatranog cilindarskog sklopa. Cilj ispitivanja materijala na zamor jeste odrediti dinamičku čvrstoću, odnosno najveći dinamički napon koji materijal pri određenom broju promjena opterećenja može da izdrži, a da pri tome ne dođe do loma.
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    POČETNA ISTRAŽIVANJA S CILJEM RAZVOJA METODOLOGIJE ZA PROCJENU INTEGRITETA CILINDARSKOG SKLOPA AVIONSKOG KLIPNOG MOTORA
    (Mašinski fakultet Istočno Sarajevo, Univerzitet u Istočnom Sarajevu, 2018) Vučetić, Nikola; Jovičić, Gordana; Milovanović, Vladimir; Krstić, Branimir; Rakić, Dragan; Tomović, Radoslav; Antunović, Ranko; Golubović, Dušan; Košarac, Aleksandar; Jeremić, Dejan
    U radu je dat pregled istraživanja mehaničkih otkaza različitih strukturnih elemenata vazduhoplova, kao u učestalost pojedinih mehanizama otkaza. Naveden je konkretan problem pucanja glave cilindra avionskog vazdušno hlađenog klipnog motora, te je predstavljen plan i cilj istraživanja u cilju razvoja metodologije za procjenu integriteta cilindarskog sklopa. U okviru planiranih istraživanja neophodno bi bilo izvršiti eksperimentalnu analizu mehaničkih karakteristika legure aluminijuma 242.0 na sobnoj i povišenoj temperaturi, kao i numeričku analizu cilindarskog sklopa. Prikazani su očekivani rezultati istraživanja, kao i zaključna razmatranja vezana za značaj samog istraživanja.