| Autor: |
Pranesh, S. B., Sathianarayanan, D., Ramadass, G. A. |
| Zdroj: |
Marine Systems & Ocean Technology; October 2024, Vol. 19 Issue: 1-2 p93-107, 15p |
| Abstrakt: |
Spherical pressure hull for manned submersible may experience extreme environmental conditions. Damage assessment of the spherical pressure hull subjected to an underwater explosion of a mine or a depth charge or a gas explosion in offshore industries is very much required. This study focuses on elastic and inelastic numerical analysis on the spherical pressure hull of 2100 mm internal diameter and 65 mm thickness subjected to a non-contact underwater explosion. Numerical analysis is carried out in finite element analysis software ANSYS. Explosion can be defined by its intensity, which is a function of the mass of the explosive and distance between the structure and the detonation point. The amount of shock energy delivered by the explosion is defined by scaled distance, whereas the energy absorbed by the structure is defined by effective shock factor. Numerical analyses under elastic and inelastic conditions are carried out for different stand-off distances. Initially, the analysis is carried out using stress–strain curve. If the structure undergoes permanent deformation, then Cowper–Symonds material model is introduced to consider the strain rate effect. At a shock factor of 3.98 and scaled distance of 0.15, the spherical pressure hull undergoes a permanent deformation of 0.7 mm. Non-contact underwater explosion damage is predicted by numerical analysis to understand the elasto-plastic behavior of the spherical pressure hull. |
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