Analysis Of Bulk Carrier Structural Style Effect On Torsional Strength

For single side bulk carriers, the side shell has become one of the weakest parts of the hull from the studies from accidents of the ships structure. It is considered that the double side structure is more rational, but the studies about the effect on the side shell of bulk carrier based on torque and how the double side shell improves the strength of the hull is not too much. Moreover, some unconventional bulk carrier styles development fast, whose strength also needs attention.In this article, the study based on the FEM method focus on how the bulk carrier structural style effect on its torsional strength, and takes the side shell as the main object, in order to find how the torsion acts on the side shell and make it clear that how the double side shell improve the strength. Furthermore, an analysis about the sensitivity of torsional strength is also included.From analyses based on the ANSYS models, the results indicate the relative high torsional stress convergence on the side shell between the top side tank and hopper tank which causes the stress increase largely is one of the causations of the destroy of the single side bulk carrier. The double side bulk carrier improves the torsional strength largely by reducing the maximum stress and improving stress convergence due to the participation of the inner side. Secondly, the torsional strength is more sensitive to the ship dimension, a large hatch opening and the geometry sides of the top side tank, which is useful in the design of bulk carrier, especially for the ship without top side tank. The mechanics model given in this study is an applied way to analyze the torsional effect on bulk carrier.