Nonlinear analysis of inter-island RoRo under impact: effects of selected collision’s parameters on the crashworthy double-side structures

Abstract

The purpose of this paper is to study the effect of selected parameters in ship collision and extend it to assessment of structural crashworthiness on the double-side structure (DSS). A brief concept and implementation of the ship-ship interaction is presented in early discussion, which is followed by fundamental factors in numerical calculation. Initial analysis is addressed to quantify influence of several element formulations types on damage extent and simulation time. According to comparison with certain RoRo collision incident data, the fully integrated version of the Belytschko-Tsay emerges as the most similar in terms of the damage criterion of analysis. Even though ordinary type of the Belytschko-Tsay produces faster time processing, fully integrated version is still chosen as it can prevent undesired phenomena during nonlinear finite element analysis. The next analysis aims to conduct crashworthiness assessment on several regions of the target ship. Collision location and attacking velocity are determined as representative of the external dynamic parameters, while material grade is considered as the internal parameter. Assessment results of the DSS are presented in forms of the statistical calculation to obtain variance percentage, and failure sequence to understand crushing process during side collision. Result tendency indicates that the velocity is nominated as the most influencing parameters to the crashworthiness criteria of the target ship. Keywords Ship-ship collision scenario Á Nonlinear FE analysis Á Shell element formulation Á Double-side structure (DSS) Á Bow-hull interaction Á Material characterization Á Crashworthiness criteria

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