13 KB285 KB11 KB200020242006Cukalla, MimozaHuebner, PeterShehu, Mira4 straniletnik:40številka:5str. 207-210ISSN:1580-2949COBISSID:577706URN:URN:NBN:SI:doc-AOSTKKY0enInštitut za kovinske materiale in tehnologijeMateriali in tehnologijekonstrukcijsko jeklomodelirazpoketrdnostutrujenost materialovThe behavior of fatigue-crack growth in shipbuilding steel using the ESACRACK approach|Crack growth-rate calculations with NASGRO 3.0 using a relationship called the ESACRACK approach were developed by Forman and Newman at NASA. A simple assessment of the crack-growth analysis is given by the Paris law, called the analytic approach; however, for a complex case this assessment is conservative. In this paper we introduced and analyze the crack-growth curve for welded shipbuilding steel using the ESACRACK approach by identifying the crack-opening function, f, the threshold stress-intensity factor, triangleKsub(th), and the critical stress-intensity factor, KsubCIzvedli smo izračune hitrosti rasti utrujenostne razpoke z NASGRO 3.0 na osnovi tako imenovanega postopka ESACRACK, ki sta ga razvila Forman in Newman pri NASI. Enostavna ocena rasti utrujenostne razpoke je možna z analitičnim načinom, ki temelji na Parisovem zakonu. Vendar pa je v kompliciranih primerih ocena preveč konzervativna. V tem prispevku smo zato analizirali rast utrujenostne razpoke v konstrukcijskem jeklu, namenjenem za varjenje ladijske pločevine po postopku ESACRACK, ki temelji na funkciji odpiranja razpoke f, mejni vrednosti faktorja intenzitete napetosti trikotnikKspodaj(th) in kritičnem faktorju intenzitete napetosti KspodajCTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije