Marine & Offshore

Simulation of local damage in ship to ship collision
K. Wisniewski, P. Kolakowski, B. Rozmarynowski, J.T. Gierlinski , WS Atkins Consultants, Epsom, United Kingdom
The paper presents results of numerical simulations of the local behaviour of a struck ship during a collision of two vessels. The struck vessel is a 105400 DWT double hull crude oil carrier, while the striking ship is a 40000 DWT container vessel with a bulbous bow, modelled as a rigid body. The dynamic analysis has been performed using the FE code ABAQUS-Explicit, which allowed to monitor the deformation and damage progression in time, accounting for large plastic strains and including the contact between the ships. To investigate sensitivity of the damage with respect to several parameters, such as : the material model, the friction coefficient for the contact between the vessels and the initial velocity of the striking ship, a number of parametric studies has been carried out.

Crack management for naval ships
Dr John D G Sumpter & John D McVee, QinetiQ Rosyth, Centre for Marine Technology, Dunfermline, United Kingdom
This presentation considers the need for a crack management policy for naval surface ships and in particular the requirements for assessing whether it is safe to leave a crack unrepaired. A case study demonstrates that it is feasible to determine that repair of cracks can be delayed if ship specific information including a finite element model, global strength estimates and a toughness database is available. Further validation and development is required before generic advice can be developed for specific classes of ship.

ShipFlex, an integral approach on hydromechanics and ship elasticity
Jack Reijmers, Nevesbu, The Hague, The Netherlands  
Hydrostatics on ship design treat buoyancy and stability, but in general go no further than the loading on the ship‘s hull. Deflection due to shear and hull bending is not taken into account although there could be a significant influence on the displaced volume.
part 2 here

Review on the workshop on 13 November 2001
Jack Reijmers, Nevesbu, The Hague, The Netherlands
The on-going story about the workshops