Time-domain fatigue assessment of ship side-shell structures
Artikel i vetenskaplig tidskrift, 2013

Loads acting on ship side-shell structures are complex and vary randomly over time. The current study proposes a direct calculation procedure for the fatigue assessment of ship side-shell structures. The calculation procedure is characterised by nonlinear time-domain hydrodynamic simulations followed by finite element (FE) analyses. Sensitivity and feasibility analyses of the proposed time-domain procedure were carried out, and the calculated fatigue damages were compared with full-scale measurements made on a container vessel. Fatigue life analyses were carried out by both the spectral method and the time-domain approach. In addition, two approaches for local stress analysis are presented and discussed: an engineering-based definition of the stress concentration factor (SCF) and a proposed local stress factor (LSF) that utilises stress ranges extracted from the stress history. The results from the fatigue analysis using the LSF indicated a shorter fatigue life than the results obtained using the SCF. This difference is observed because the LSF accounts for the effects of wave-induced loads under ship operation conditions in a more realistic manner.

full-scale measurement

nonlinear time-domain approach

stress concentration factor

Fatigue

ship side-shell structure

Författare

Zhiyuan Li

Chalmers, Sjöfart och marin teknik, Marine Design

Jonas Ringsberg

Chalmers, Sjöfart och marin teknik, Marine Design

Gaute Storhaug

DNV GL AS

International Journal of Fatigue

0142-1123 (ISSN)

Vol. 55 1 276-290

Ämneskategorier

Maskinteknik

Beräkningsmatematik

Annan materialteknik

Farkostteknik

Sannolikhetsteori och statistik

Drivkrafter

Hållbar utveckling

Innovation och entreprenörskap

Styrkeområden

Transport

Materialvetenskap

DOI

10.1016/j.ijfatigue.2013.07.007