Ultimate Longitudinal Capacity Of Damaged Large-scale Double Shell Oil Tanker

all ships all face with the damage of colliding and grounding during the transportation. After Ship damaged, it will not only cause serious economic losses, but also caused incalculable effects because the liquid cargo or fuel leak to the marine environment. Therefore, IMO made a mandatory requirement for phasing out of single-hull oil tankers in 2001, to avoid fuel or liquid cargo leaking after ship damaged. However, because the hull overall intensity and the partial intensity have received great influence, The inner shell may damaged, and the oil tanker may submerged in the rescue. Therefore, in the ships science, It is necessary to research the relationship between the crevasse and limit bearing capacity.the most important index to appraise the limit bearing capacity of double shell oil tanker is longitudinal moment. Now, There are main four kinds of methods to calculate the longitudinal moment of ship hull, they are empirical formulas method, nonlinear finite element method, idealized structural unit method and simplified Smith method. Simplified Smith method is a relative simple and effective method for the calculation of longitudinal strength of ship hull. Simplified Smith method is a relative simple and effective method for the calculation of longitudinal strength of ship hull.based on the simplified Smith method, We design a 105000 tons double shell oil tanker and calculate its longitudinal limit moment, the cross-sectional distribution of stress and the location of neutral axis in many different cases which contain crevasse location, crevasse size, and crevasse shape. And on the base, we find and explain many important phenomena and rules.