A Study on Inelastic Whipping Responses in a Navy Ship by Underwater Explosion

2021 ◽  
Vol 58 (6) ◽  
pp. 400-406
Author(s):  
Hyunwoo Kim ◽  
Jae Hoon Seo ◽  
Joonmo Choung
Keyword(s):  
Underwater Explosion

A Study on the Characteristics of Underwater Explosion for the Development of a Non-Explosive Test System

2020 ◽  
Vol 57 (6) ◽  
pp. 322-330
Author(s):  
Hansol Lee ◽  
Kyudong Park ◽  
Yangsub Na ◽  
Seunggyu Lee ◽  
Kyunghoon Pack ◽  
...  
Keyword(s):  
Underwater Explosion ◽  
Test System

An engineering application of Prosperetti and Lezzi equation to solve underwater explosion bubbles

2021 ◽  
Vol 33 (1) ◽  
pp. 017118
Author(s):  
Jingxiao Zhang ◽  
Shushan Wang ◽  
Xiyu Jia ◽  
Yuan Gao ◽  
Feng Ma
Keyword(s):  
Engineering Application ◽  
Underwater Explosion

The influence of strain rate on the cavitation time and deformation of an underwater impulsively rectangular plate

2021 ◽  
pp. 030932472110208
Author(s):  
Habib Ramezannejad Azarboni ◽  
Abolfazl Darvizeh
Keyword(s):  
Constitutive Equation ◽  
Strain Rate ◽  
Rectangular Plate ◽  
Total Pressure ◽  
Elastoplastic Deformation ◽  
Underwater Explosion ◽  
Strain Rate Effect ◽  
Linear Solution ◽  
Explosion Load ◽  
Explosive Forming

The effect of strain rate on the cavitation time and elastoplastic deformation of steel rectangular plate subjected to underwater explosion load is analytically and numerically investigated in this study. At the cavitation time, the total pressure of the explosion is eliminated so that the cavitation time plays a significant role in the elastoplastic deformation of underwater explosive forming of plate. Taking into account the strain rate effect, the Cowper-Symond constitutive equation of mild steel is employed. Exact linear solution using the Eigen function and numerical linear and nonlinear solution using finite difference method (FDM) of dynamic response of impulsively plate is obtained. Implementing the linear work hardening, the stress, strain, displacement, and velocity in any steps of loading are calculated. The time of cavitation can be recognized in elastic or plastic regimes by applying the Cowper-Symond constitutive equation. Considering the strain rate influence, the effects of charge mass and standoff are investigated to occur of cavitation and time dependent deflection and velocity of a rectangular plate.

Modeling the Effects of Underwater Detonation Wave

2013 ◽  
Vol 588 ◽  
pp. 175-183
Author(s):  
Andrzej Grządziela
Keyword(s):  
Vibration Spectrum ◽  
Water Environment ◽  
Underwater Explosion ◽  
Impulse Loading ◽  
Structure Model ◽  
Measuring Systems ◽  
Shaft Line ◽  
Hull Structure ◽  
On Line ◽  
Vibration Measuring

Minehunters are subjected to specific sea loads due to waving and dynamical impacts associated with underwater explosion. Sea waving can be sufficiently exactly modeled by means of statistical methods. Much more problems arise from modeling impacts due to underwater explosion. Knowledge of a character of impulse loading which affects ship shaft line can make it possible to identify potential failures by means of on-line vibration measuring systems. The problem of influence of sea mine explosion on hull structure is complex and belongs to more difficult issues of ship dynamics. Underwater explosion is meant as a violent upset of balance of a given system due to detonation of explosives in water environment. A paper presents a proposal of identification of a degree of hazard the ships hull forced from underwater explosion. A theoretical analysis was made of influence of changes of hull structure in vicinity of hull. The main problem of naval vessels is a lack of dynamical requirements of stiffness of the hull. Modeled signals and hull structure were recognized within sensitive symptoms of three sub models: model of hull structure, model of impact and model of propulsion system. All sub models allow testing forces and their responses in vibration spectrum using SIMULINK software and FEM models.

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