Study on influence of nonlinear finite element method models on ultimate bending moment for hull girder: Fid-Bau Portal

Study on influence of nonlinear finite element method models on ultimate bending moment for hull girder

Xu, Ming Cai / Song, Zhao Jun / Pan, Jin

AbstractThe various assessment methods of ultimate strength for hull girder of ships or offshore structures might lead to different results and computation time. The nonlinear finite element (FE) analyses include the implicit static analysis and explicit dynamic analysis, which both can consider the large deflection and material nonlinearity during the process of progressive collapse. Comparing with the implicit static analysis, the explicit dynamic analysis can consider the transient influence of time and avoid the convergence issue in iterative procedure. The object of the present paper is to figure out a reliable and suitable FE modelling in the explicit dynamic method, which could keep the balance of the acceptable accurate results and computation resources. Several influential factors on the collapse behaviours of hull girder are discussed including boundary conditions, geometric ranges of finite element model, element types, loading methods and loading time. The results of a Suezmax oil tanker and Reckling models assessed by the explicit dynamic method are compared with that by the other analytical methods or in the experiment.

Highlights•Imposing rotation angle method is appropriate to model the bending moment of hull girder.•The three-span model can consider the interaction of the adjacent members.•It is suggested to adopt the shell element for both plate and stiffener.•A proper loading time is advised for explicit dynamic analysis.