Naslov
Multiple Fatigue Cracks Propagating in a Stiffened Panel

Autori
Božić, Željko ; Sumi, Yoichi ; Iyama, Hisashi ; Kawamura, Yasumi

Izvornik
Journal of the Society of Naval Architects of Japan (0514-8499) 179 (1996), 3-13; 407-412

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

Ključne riječi
fatigue; multiple cracks; stiffened panel

Sažetak
Crack growth of a single crack or a periodical array of cracks initiated at the stiffeners in a stiffened panel has been investigated. Using stiffened panel specimens, fatigue crack propagation tests have been carried out with cyclic stress of constant amplitude and frequency. A procedure for simulation of crack propagation for multiple cracks was introduced. The stress intensity factors have been calculated by a FEM program. From experimental a-N data for simple plate specimens, the fatigue crack propagation rate was obtained, and the Paris' constants have been determined. By means of the material constants and the stress intensity factors, the fatigue crack growth has been simulated for all test specimens. The experiment and numerical simulation have shown that in case of stiffened panel with three cracks, the crack growth rate is higher compared with stiffened panel having a single crack, because in case of three cracks the net sectional area is reduced, and also the adjacent cracks interact with each other. For an actual deck of a ship structure, the ratios of crack growth lives for multiple site damage and a single crack damage have been investigated. In case of multiple site damage cracks it is found that the crack propagation rate is several times higher than the latter.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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