Energy Absorption Characteristics and Assessment of Failure Criteria During Ship Collisions

Glykas, Alexandros (1998) Energy Absorption Characteristics and Assessment of Failure Criteria During Ship Collisions. PhD thesis, University of Glasgow.

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Ship collision against rigid bodies is a very complex phenomenon and a large number of parameters are involved. All analytical methods developed until now consider the colliding ship as a rigid structure. This suggests that methods used to date have not considered the deformation of the ship. The potential energy derived is estimated as a function of the available kinetic energy prior to the collision. Especially in the case of grounding the response of the ship during the impact is examined with the equations of motion and kinematic relationships. The energy dissipated on the structural members and the kinetic energy lost due to the collision still remains unknown. The use of Finite Element Methods has proved to be, one way to analyse the structural response of a ship structure during collision. It is feasible to ascertain the effect of mass inertia, strain rate hardening, complicated boundary conditions etc. In this thesis a three-dimensional finite element model of a bow, is presented for the collision and grounding with a rigid object. The energy dissipation of the structural configuration is examined and compared with the existing empirical methods. A parametric study is performed and the results are presented in terms of velocity, the duration of the collision and the relative penetration. An evaluation for the calculation of the indentation is compared with existing empirical approaches. Furthermore a fracture criterion is introduced on the basis of the energy released during crack propagation. A comparative study is shown involving three other failure criteria and the fracture criterion utilisation is validated on the bow model during the collision with a rigid surface. Results are generated with regard to the indentation, limit speeds and potential energy dissipated on the bow.

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Additional Information: Adviser: P K Das
Keywords: Naval engineering
Date of Award: 1998
Depositing User: Enlighten Team
Unique ID: glathesis:1998-75883
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 19 Nov 2019 17:40
Last Modified: 19 Nov 2019 17:40

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