Ship bow response in high energy collisions

Kierkegaard, Henning

doi:10.1016/0951-8339(93)90002-k

Cited by 15 publications

(1 citation statement)

References 7 publications

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“…Assuming that the collapse pattern is determined at an early stage of crushing and remains constant during further crushing, Amdahl (1983) calculated the parameter to be k = 0.573. This has been widely accepted by other authors on the problem of crushing of plated structures, for example Kierkegaard (1993) and Paik and Pedersen (1995). The central part of the transverse member with breadth 2C, which equals the span of the contact surface with the indenter, is considered to be two flanges of a cruciform.…”

Section: Simplified Methods For Transverse Membersmentioning

confidence: 99%

Rapid assessment of ship grounding over large contact surfaces

Lin

Amdahl

2012

Ships and Offshore Structures

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A simple method for the rapid assessment of ship bottom structures subjected to grounding over seabed obstructions with large contact surfaces is proposed in this paper. It has been recognised that the shape and size of the seabed obstruction is of crucial importance in relation to the characteristics of bottom damage. Most studies on ship grounding are concerned with 'rock-type' sharp obstructions, where plate tearing is the dominating failure mode. However, very few studies are found related to grounding over blunt obstructions with large contact surfaces such as 'shoals'. Denting rather than tearing is more likely for the bottom plating as observed from actual grounding incidents. The sharp obstruction may cause earlier penetration and result in very unfavourable consequences such as compartment flooding. In contrast, the bottom plating may not fracture when moving over a blunt-type sea floor. But it may threaten the global hull girder resistance and give rise to even worse consequences such as hull collapse. The proposed simple method is established on the basis of a series of closed-form solutions for individual structural members developed from the plastic mechanism analysis. The primary deformation modes for the major bottom structural members are sliding deformation of longitudinal girders, denting and crushing of transverse members and indentation of bottom plating. The effect of friction is considered and estimated in a simple manner. The vertical resistance that governs the vertical ship motion is derived. It is found that the vertical resistance is free of friction. The proposed simple method for bottom strength is verified against large-scale non-linear finite element analyses, where a good correlation is obtained.

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Section: Simplified Methods For Transverse Membersmentioning

confidence: 99%