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Analiza zloma osi [fi] 176 mm pri tovornem vagonu 31 79 665 05002-4 : poročilo št. P 26102
Kovše, Igor ; Gerdun, Viktor, 1971-
Z lomnomehanskih preskusom na vzorcu iz materiala gredi smo določili konstante v Parisovem zakonu hitrosti rasti razpoke. Z integracijo tega zakonasmo dobili oceno za število ciklov potrebno za ...napredovanje razpoke od 2 mm do 120 mm. Glede na to, da en cikel pomeni en obrat kolesa, smo ocenili, da čas rasti razpoke od velikosti 2 mm do 120 mm ustreza prevoženim 60000 kilometrov polnega vagona. Pri 80000 povprečno prevoženih kilometrih na leto in oceni, da je vagon poln 50% časa, pomeni da razpoka zraste od 2mm do 120 mm v približno 1,5 leta. Rast razpoke pri praznem vagonu je v primerjavi s polnim vagonom zanemarljiva. Rast razpoke je neenakomerna: od 2 mm do 10 mm raste razpoka pirbližno v 40000 km (1 letu), nato pa v 20000 km (0,5 leta) zraste od 10 mm do 120 mm, tj. do porušitve. Pravilnost lomnomehansko izmerjene hitrosti razpoke na vzorcu gredi smo dodatno preverili z meritvijo velikosti brazd na fraktografskih posnetkih. Ugotovili smo dobro ujemanje.
Type of material - research report
Publication and manufacture - Ljubljana : IMK, april 2004
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