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Citation:
　F. Mannacio,F. Di Marzo,M. Gaiotti,et al.A Design Approach to Assess Effects of Non-Contact Underwater Explosions on Naval Composite Vessels[J].Journal of Marine Science and Application,2024,(2):316-326.[doi:10.1007/s11804-024-00421-6]
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A Design Approach to Assess Effects of Non-Contact Underwater Explosions on Naval Composite Vessels

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Title:
A Design Approach to Assess Effects of Non-Contact Underwater Explosions on Naval Composite Vessels
Author(s):
F. Mannacio1;  F. Di Marzo1;  M. Gaiotti2;  C. M. Rizzo2;  M. Venturini1
Affilations:
Author(s):
F. Mannacio1;  F. Di Marzo1;  M. Gaiotti2;  C. M. Rizzo2;  M. Venturini1
1 Italian Navy, Naval Support and Experimentation Centre, CSSN Viale S. Bartolomeo, 400, 19126 La Spezia (Italy);
2 University of Genova, Polytechnic School, DITEN Via Montallegro, 1, 16145 Genova (Italy).
Keywords:
Underwater explosions|Shock resistance|Composites|Fluid-structure interaction|Experimental analysis|Numerical simulation|Vulnerability|Preliminary design
分类号:
-
DOI:
10.1007/s11804-024-00421-6
Abstract:
Despite the non-contact underwater explosion phenomena (UNDEX) have been studied for decades and several numerical methods have been proposed in literature, its effects on military structures, especially composite ones, are even nowadays matter of research. In early design phases, it is not always possible to verify the shock resistance of hull structures modelling the whole phenomenon, in which fluid, gas and solid properties must be properly set in a fully coupled fluid-structure interaction (FSI) numerical model. These ones are extremely complex to set, computationally demanding and certainly not suitable for everyday design practice. In this paper, a simplified finite element (FE) model, easy to use in an early design phase, is proposed. Both, the structure and the fluid are simulated. In this approximation, the fluid behaviour is simplified, using special finite elements, available in a commercial software environment. This choice reduces the computational time and numerical efforts avoiding the problem of combining computational fluid dynamics (CFD) and FE domains and equations in a fully coupled fluidstructure interaction model. A typical parallel body block of a minesweeper is modelled, using two-dimensional multi-layered shell elements to properly account for the composite materials behaviour. For the fluid instead, three dimensional volumetric elements, directly coupled to the structural elements, are placed. In addition, the same calculation is performed, modelling separately fluid in the CFD environment and structures in the finite element one. Thus, realizing a fully coupled fluid-structure interaction model. The results obtained by applying both numerical models are compared with the structural response measured on board of a composite ship during a full-scale shock test. The simplified proposed procedure provides results in satisfactory agreement with experiments, allowing the validation of the model. Approximations are discussed and differences with the real phenomenon and fully coupled CFD+FE method are shown, providing a better understanding of the phenomena. Eventually, the modelling strategy has been considered a valuable and cost-effective tool for the concept and preliminary design of composite structures subject to underwater explosions.

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Memo

Memo:
Received date: 2023-07-06;Accepted date: 2023-12-19。
Corresponding author: F. Mannacio,E-mail:francesco.mannacio@marina.difesa.it
Last Update: 2024-05-28