Eksperimentalno i numeričko ispitivanje cevnog luka urađenog od cevi izlaznog međupregrejača pare nakon eksploatacije

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Published: Mar 2, 2020
DOI: https://doi.org/10.2298/HEMIND190905005P
Keywords:
međupregrejač pare, cevni luk, čelik 12H1MF, gasna korozija, korelacija digitalnih slika, metoda konačnih elemenata.

Main Article Content

Vladimir Pavkov
Institut za nuklearne nauke "Vinča", Laboratorija za materijale 170
Gordana Bakić
Mašinski fakultet, Univerzitet u Beogradu
Vesna Maksimović
Institut za nuklearne nauke Vinča, Univerzitet u Beogradu
Aleksandar Petrović
Mašinski fakultet, Univerzitet u Beogradu
Nenad Mitrović
Mašinski fakultet, Univerzitet u Beogradu
Žarko Mišković
Mašinski fakultet, Univerzitet u Beogradu

Abstract

Jedan od važnih zadataka procene integriteta mašinskih elemenata i konstrukcija je određivanje lokalnih mehaničkih svojstava. U ovom radu izvršeno je eksperimentalno i numeričko ispitivanje mehaničkih svojstava cevi, izlaznog međupregrejača pare, izrađenog od toplotnopostojanog čelika 12H1MF, nakon 200.000h rada. Cev izlaznog međupregrejača pare je isečena iz cevnog sistema tokom remonta termoelektrane, a potom hladno deformisana savijanjem, u cilju dobijanja cevnog luka, za potrebe eksperimenta. Namenski je konstruisan držač za ispitivanje takvog uzorka. Eksperimentalno istraživanje je bazirano na primeni 3D metode korelacije digitalnih slika, dok je metoda konačnih elemenata primenjena u numeričkoj simulaciji. Metoda 3D korelacije digitalnih slika predstavlja optičku i bezkontaktnu eksperimentalnu metodu koja omogućava merenje polja pomeranja i deformacija geometrijski kompleksnih struktura. Za eksperimentalnu analizu kao i verifikaciju numeričkog modela korišćen je sistem Aramis, baziran na metodi korelacije digitalnih slika. Na osnovu dobijenih rezultata i uporedne analize eksperimentalnih i numeričkih vrednosti, koje se odnose na von Mizesove deformacije na temenu cevnog luka, javlja se odstupanje od oko 18%. Ovo odstupanje nastaje kao rezultat korišćenih metoda koje imaju bitne razlike u njihovim početnim uslovima ispitivanja.

Article Details

How to Cite
[1]
V. Pavkov, G. Bakić, V. Maksimović, A. Petrović, N. Mitrović, and Žarko Mišković, “Eksperimentalno i numeričko ispitivanje cevnog luka urađenog od cevi izlaznog međupregrejača pare nakon eksploatacije”, Hem Ind, vol. 74, no. 1, pp. 51–63, Mar. 2020, doi: 10.2298/HEMIND190905005P.
Issue
Vol. 74 No. 1 (2020)
Section
Engineering of Materials - Metal materials
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How to Cite

[1]
V. Pavkov, G. Bakić, V. Maksimović, A. Petrović, N. Mitrović, and Žarko Mišković, “Eksperimentalno i numeričko ispitivanje cevnog luka urađenog od cevi izlaznog međupregrejača pare nakon eksploatacije”, Hem Ind, vol. 74, no. 1, pp. 51–63, Mar. 2020, doi: 10.2298/HEMIND190905005P.
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