Characteristics of material, ship side structure response and ship survivability in ship collisions

Abstract

Research on ship collision and grounding has taken giant steps during the last decade. One reason is that computer capacity has increased and, therefore, also the possibility to simulate various collision scenarios in a realistic way using more advanced and larger models. As a result, it has been possible to investigate in more detail the understanding of structural integrity, characteristics and failure phenomena that interact during, for example, a collision. This article summarises research experiences from a research group that has been working with ship collision safety, using both experiments and numerical simulations by finite element (FE) analysis. Results are presented from tensile and forming limit tests, followed by FE analyses of these with the objective of predicting material rupture using appropriate constitutive material models and damage criteria. An example of an innovative design of a side-shell structure that is considered to be more intrusion-tolerant than most side-shell structures used today is demonstrated. Finally, results from a research project which has a holistic approach on the assessment of survivability of a struck ship are presented. In the project, a methodology has been developed which combines structural analysis and damage stability analysis followed by risk analysis.

Modelling and experimental testing of expanded granules as crash‐absorber for double hull ships

“…Between two steel plates, with a distance of 280 mm and made of Steel 235, a rectangular box is placed, as shown in figure 1. The overall dimensions of this test rig is inspired by [1] to allow for additional comparisons with their results. Thus, the outer and inner hull are 1500 mm × 1090 mm and the box for the granulate is 750 mm × 700 mm.…”

Finite element simulation of blank torpedo impact on submarine hulls

“…Numerous models have been developed to simulate the internal mechanics of ship-to-ship collisions and grounding (Ehlers et al, 2008;Ringsberg, 2009;Zhang and Suzuki, 2006;Zheng et al, 2007). However, the scenarios used for the collision assessment were developed for impacts were the kinetic energy of the impacting object exceeded 100 MJ (Klanac et al, 2009;Samuelides et al, 2008).…”

Rapid hull collapse strength calculations of double hull oil tankers after collisions

“…Previously, several studies were conducted concerning ship hull impact and collision consequences analysis (Zhang and Suzuki 2006;Paik 2007;Ringsberg 2010;Pill and Tabri 2011). The longitudinal hull girder strength capacity of the hypothetical ships is calculated using ALPS/HULL (2016) ISFEM software.…”