Naslov
Pressure Vessel Steels Crack Driving Force Assessment Using Different Models

Autori
Vukelić, Goran ; Brnić, Josip

Izvornik
Journal of constructional steel research (0143-974X) 72 (2012); 29-34

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
pressure vessel steel; crack; crack driving force; SENB specimen; DCT specimen

Sažetak
Fracture behaviour of two pressure vessel steels, 20MnMoNi55 and 50CrMo4, was numerically investigated in this work. The research was conducted using numerical models of single-edge notched bend (SENB) and disc compact type (DCT) specimens. J-integral, an important fracture mechanics parameter, was chosen as a criterion for the fracture behaviour comparison of two mentioned steels. J-integral values were determined using newly developed numerical algorithm coupled with finite element (FE) analysis. Numerically obtained J-integral values are presented as a measure of crack driving force versus crack growth size (Δa) for a range of initial crack sizes (a/W = 0.25, 0.375, 0.5, 0.625). Fracture behaviour of two steels was investigated using numerical models of pressure vessels containing also inner axial crack of different sizes (a/t = 0.25, 0.375, 0.5, 0.625). Although Jintegral values cannot be transferred from specimens to real structures, results obtained on pressure vessels have proved useful in engineering assessment of fracture behaviour of such structures.

Izvorni jezik
Engleski

Znanstvena područja
Brodogradnja, Strojarstvo, Temeljne tehničke znanosti

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