Collapse Analysis of Ship Hull Girder Using Hydro-Elastoplastic Beam Model: Part 2

Abstract

In Part 1 study, a time-domain collapse analysis method of ship hull girder was developed and named FE-Smith method. Hull girder was treated as elastoplastic beam model and Smith’s method was used for collapse analysis of cross sections. A concept of average stress-average plastic strain relationship was introduced so that nonlinear collapse behavior of members can be treated as pseudo strain-hardening/softening behavior. Fluid-structure interaction effects were considered. Uniform cross-section beam was assumed as a most fundamental study. In this Part 2, a container ship is taken as subject model. Not only FE-Smith analysis but also non-linear FE analyses using shell model for collapse parts are performed for comparison purpose. Two types of average stress-average strain curves are considered for FE-Smith analysis, i.e. obtained by Gordo-Soares formulae and by shell FEM. Applicability of FE-Smith method is examined comparing with more precise but time-consuming methods. Some parametric studies are also performed. Wave response will be reported in the next papers.

Collapse response analysis of a ship's hull girder in cyclic focused waves using a hydro-elasto-plastic beam model

“…This means the progressive collapse behaviour of the hull-girder cross section is treated as material hardening/softening behaviour of the beam element. Since the FE/Smith method performs the progressive collapse analysis according to Smith's method within the framework of the finite element method, it can be extended to various load conditions other than static bending, such as combined bending and lateral load and dynamic load (Ko et al 2018).…”

“…The FE/Smith method was extended to analyse dynamic collapse behaviour of the hull girder under impulsive bending load (Ko et al 2018;Ko et.al. 2020).…”

“…The present study addresses this issue using a newly adapted numerical simulation method to predict post-collapse behaviour/response of the hullgirder in a series of focused waves including cyclic elasto-plastic buckling effects. The adaptation builds on a previously developed hydro-elasto-plastic beam model by Ko et al (2018; to predict the dynamic collapse behaviour of a hull girder in waves.…”