Residual strength assessment of corroded ships involved in ship-to-ship collisions
Typ
Examensarbete för masterexamen
Program
Naval architecture and ocean engineering (MPNAV), MSc
Publicerad
2019
Författare
Baxevanis, Dimitrios
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Ships and marine structures are forced to operate in a very complex environment with corrosion
to be regarded as one of its main features. Another crucial aspect of shipping operation is the
ship collisions. The possibility of an accidental collision can’t be ignored due to the increase
of traffic density. The objective of the present study is to estimate the ultimate strength of
damaged ships considering the effects of material degradation due to corrosion. A review of
the corrosion models, which can be used for the prediction of the thickness reduction of the
hull, is included. The structural damage of non-corroded and corroded ships involved in ship
collisions are calculated by nonlinear FEA. The Smith-Fujikubo method is applied for the
residual strength assessment of the damaged ship under biaxial loading conditions. The largest
reduction of the ultimate strength is observed when the most severe structural damage appears
in a corroded hull showing a correlation between residual strength and corrosion presence. The
most significant ultimate strength decrease is found in loading directions, which do not
correspond to hogging and sagging conditions concluding the importace of the biaxial loading
in the residual strength assessment.
Beskrivning
Ämne/nyckelord
Biaxial loading , corrosion , corrosion models , material degradation , residual strength , ship collisions , ultimate strength