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2019, vol. 69, br. 2, str. 8-16
Uticaj cikličnih opterećenja na strukturna oštećenja pogonskih punjenja raketnih motora
aVojnotehnički institut - VTI, Beograd
bUniverzitet odbrane, Vojna akademija, Beograd

e-adresanikola.gligorijevic@gmail.com
Sažetak
Pogonsko punjenje raketnog motora, direktno liveno ili vezano za komoru ili čvrstu oblogu, izloženo je različitim opterećenjima tokom veka upotrebe. Raketno gorivo je viskoelastični materijal, čije mehaničke osobine značajno zavise od temperature i brzine deformacije. Dejstvo cikličnih opterećenja, pre svega termičkih, na raketni motor na skladištu, može da izazove neželjena oštećenja pogonskog punjenja. Vremenom, posle dugog skladištenja, nagomilana oštećenja mogu da porastu toliko da izazovu lom punjenja. Jedan od načina da se proceni ova pojava je da se odredi zakon akumulacije oštećenja. U ovom primeru, zakon je određen za jedan sastav kompozitnog raketnog goriva na bazi hidroksi-terminiranog polibutadiena (HTPB), izlaganjem njegovih uzoraka različitim dugotrajnim naprezanjima. Pomoću ovog zakona moguće je izračunati verovatnoću loma i vremensku promenu strukturne pouzdanosti pogonskog punjenja, sa ciljem da se proceni vek upotrebe. Pored toga, analiza je pokazala da postoji moguća korelacija zakona akumulacije oštećenja i zatezne čvrstoće. Ova činjenica može da se iskoristi umesto izvođenja dugotrajnog eksperimenta kojim se precizno određuje zakon akumulacije oštećenja.
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O članku

jezik rada: engleski
vrsta rada: neklasifikovan
DOI: 10.5937/str1902008G
objavljen u SCIndeksu: 14.02.2020.
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