A pseudo-coupled analytic fluid-structure interaction method for underwater implosion of cylindrical shells

Gish, L. Andrew

doi:10.1016/j.apor.2017.05.013

Cited by 10 publications

(2 citation statements)

References 8 publications

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“…22 The particularity of the underwater environment leads to a structural damage mechanism that is different from that on land. The shell under deep water pressure can suffer buckling damage under impact without exceeding the ultimate strength, 23,24 and the degree of damage is strongly influenced by shell thickness, impact velocity, and material properties. 25,26 Moreover, it is necessary to consider the accurate solution process of the dynamic coupling between the structural wall and the strong turbulence model near the submarine.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the dynamic behavior of the ring-stiffened double-shell structure due to subsea collisions

Wang,

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The ring-stiffened double-shell structure is currently widely utilized in the equipment for ocean engineering, of which the response analysis under subsea impact is important to accomplish the safety and highly difficult Marine missions. However, due to the complex characteristics of the research object including fluid-solid coupling contact, large deformation, short response time, and multiplet structure, the dynamic behavior of the impacted ring-stiffened double-shell structure is hard to analyze accurately by traditional numerical methods. To overcome challenges, a fresh modeling and solving approach for the impacting mechanism of the structure body is put forward by this paper. The method is based on the Arbitrary Lagrange-Euler and Fluid-Structure-Interaction (ALE-FSI) theory. A stiffness matrix of a penalty function and steady outer pressure setting is presented to build the underwater interaction model. Then, the ALE-based description method is proposed to simulate the collision process. The results indicate that the adopted modeling and solving methods for the subsea structural collision have better revealed the dynamic response process of subsea structure to impact. There isn’t any evident damage spreading to the surrounding region, and the structural damage is primarily contained in the collision area. When an underwater impact is applied to the double shell structure, the non-pressure shell provides better protection. The core academic achievement of this work is providing an effective approach for subsea impacting mechanism and nonlinear dynamic response of ring-stiffened double-shell structure which can be used in different scenarios. It can offer universal references to optimize the construction of underwater equipment and determine the level of impact damage to submarines.

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Section: Introductionmentioning

confidence: 99%

Investigation on the dynamic behavior of the ring-stiffened double-shell structure due to subsea collisions

Wang,

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The effects of the material and geometrical properties, external pressure, and added mass of the spherical shells are then investigated and discussed. It was reported that the deep pressure hull could be buckled without exceeding the limited strength under collision [29,30], which can be strongly affected by the shell thickness, collision velocity, and properties of materials [31,32]. Nevertheless, spherical pressure hulls are the most efficient and popular type for the deep-sea pressure hull structures [33][34][35], as the spherical hull has the lowest buoyancy factor (weight-to-buoyancy ratio) [36,37].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Dynamic Buckling of Spherical Shell Structures Due to Subsea Collisions

Liu

Kaewunruen²,

Zhou

et al. 2018

Applied Sciences

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This paper is the first to present the dynamic buckling behavior of spherical shell structures colliding with an obstacle block under the sea. The effect of deep water has been considered as a uniform external pressure by simplifying the effect of fluid–structure interaction. The calibrated numerical simulations were carried out via the explicit finite element package LS-DYNA using different parameters, including thickness, elastic modulus, external pressure, added mass, and velocity. The closed-form analytical formula of the static buckling criteria, including point load and external pressure, has been firstly established and verified. In addition, unprecedented parametric analyses of collision show that the dynamic buckling force (peak force), mean force, and dynamic force redistribution (skewness) during collisions are proportional to the velocity, thickness, elastic modulus, and added mass of the spherical shell structure. These linear relationships are independent of other parameters. Furthermore, it can be found that the max force during the collision is about 2.1 times that of the static buckling force calculated from the analytical formula. These novel insights can help structural engineers and designers determine whether buckling will happen in the application of submarines, subsea exploration, underwater domes, etc.

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Experimental study on dynamic buckling of submerged grid-stiffened cylindrical shells under intermediate-velocity impact

Ren

Song

Zhang

et al. 2018

Applied Ocean Research

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A pseudo-coupled analytic fluid-structure interaction method for underwater implosion of cylindrical shells

Cited by 10 publications

References 8 publications

Investigation on the dynamic behavior of the ring-stiffened double-shell structure due to subsea collisions

Investigation on the dynamic behavior of the ring-stiffened double-shell structure due to subsea collisions

Investigation of the Dynamic Buckling of Spherical Shell Structures Due to Subsea Collisions

Experimental study on dynamic buckling of submerged grid-stiffened cylindrical shells under intermediate-velocity impact

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