Oludi, Kingsley & Nwoka. B.G
Application of Scale Finite Element Method for Evaluating Ship Longitudinal Strength
Abstract
This research investigates the longitudinal strength of ship hull girders under complex loading conditions using nonlinear finite element method (FEM) analysis. The study employs ABAQUS software to model the MST-3 vessel, focusing on vertical bending moments and the effects of torsion. A comprehensive three-dimensional finite element model spanning three web frame spacings is developed to ensure the validity of the analysis, with boundary conditions and material properties carefully defined. The results highlight critical stress distributions within the hull girder, emphasizing that hull girder stresses due to vertical bending and torsion significantly influence total stress, especially near cargo hold bulkheads and hatch coamings. Torsion-induced warping stresses were found to be predominant in open-deck configurations. The FEM results closely align with experimental findings, demonstrating the model's accuracy in predicting the ultimate longitudinal strength of the hull girder. This study underscores the efficacy of nonlinear FEM analysis in assessing ship structural integrity under various load conditions and contributes valuable insights into hull girder behavior. The findings provide a foundation for improving ship design practices, ensuring structural reliability, and enhancing safety in marine operations.
Keyword; Design, Hull Girder, Stress, Torsional Effects, Bending Momen
