engleski

Finite element study of residual ultimate strength of a double hull oil tanker damaged in collision and subjected to bi-axial bending

The aim of the study is the nonlinear finite element method (NFEM) assessment of the residual ultimate strength of an Aframax-class double hull oil tanker damaged in collision and subjected to combined horizontal and vertical bending moments. The explicit dynamic integration method implemented in LS-Dyna is employed. The FE model extends over three web frame spacing. Collision damage is assumed to start from the main deck downwards. Two types of damage were considered: damage of the outer shell only and a damage of both the outer and inner shell. Residual strength interaction diagrams are developed with the purpose of rapid residual ultimate longitudinal strength assessment of the damaged oil tanker under combined bending moments. Following this, the developed interaction diagrams are compared with previously published research as well as with Smith’s type progressive collapse analysis (PCA) method for bi-axial bending. A contribution to current research of the problem is offered through a systematic NFEM investigation of double hull oil tanker residual strength under combined horizontal and vertical bending moments that has not been performed previously.

Ship structure ; residual strength ; collision ; combined bending ; nonlinear finite element method

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