Effect of thickness on the buckling strength of egg-shaped pressure hulls

Zhang, Jian; Wang, Minglu; Cui, Weicheng; Wang, Fang; Hua, Zhengdao; Tang, Wenxian

doi:10.1080/17445302.2017.1389253

Cited by 24 publications

(6 citation statements)

References 25 publications

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“…[16][17][18] Zhang researched the relationship between structural buckling and pressure hulls with different shapes and thicknesses. 19 The conclusions showed that the pressure hull in the shape of an egg appears to be suitable for subsea vehicles at the whole ocean depth. Khakina 20 and Evkin and Lykhachova 21 researched buckling loads in terms of the energy change caused by the underwater collision.…”

Section: Introductionmentioning

confidence: 96%

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: 96%

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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“…To optimally coordinate the structural safety, defect sensitivity, space utilization, and hydrodynamic properties, scholars [5] have proposed a positive Gaussian multi-curvature eggshaped thin-walled closed shell from the perspective of bionics. It has advantages in defect sensitivity, structural safety, space utilization, and human-machine interaction [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Study of plastic deformation and quality of flexible medium forming of bionic egg-shaped shell

sun,

Shi,

Shen

et al. 2024

Preprint

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Aiming at the problems of large deviation of plastic machining accuracy and different buckling instability loads of bionic egg-shaped shells under different flexible medium forming technologies, it is proposed to adopt unidirectional loading rubber bulging and granular medium bulging technologies of bionic egg-shaped shells. By comparing the plastic machining accuracy, geometric accuracy, and strength of bionic egg-shaped shells with different flexible mediums, the machining accuracy and overall quality of bionic egg-shaped shells can be improved. To explore the stress and strain conditions in different stages and regions of egg-shaped shell flexible medium forming technologies under the ideal condition of considering the thickness stress, the mechanical analysis of egg-shaped shell flexible medium forming technologies is carried out. The simulation analysis and experimental verification methods are used to analyze the forming process of egg-shaped shells with different flexible mediums and verify the accuracy of the numerical analysis model. Then, in order to master the influence of flexible medium forming technologies on the plastic deformation and quality of egg-shaped shells, the influence of different flexible medium forming technologies on the plastic machining accuracy, geometric accuracy, and strength of egg-shaped shells is researched. The study shows that the results of the numerical analysis of the egg-shaped shell flexible medium forming technology have an average error of no more than 11% with the test, and the numerical analysis model can be considered accurate. Moreover, the plastic machining accuracy of egg-shaped shell process parts and egg-shaped parts with granular medium is better than that of rubber medium. The maximum strain of the egg-shaped part is 4% higher than that of the rubber medium, and the maximum thinning rate is 13.9% smaller than that of the rubber medium. The geometric accuracy deviation of the egg-shaped part of the egg-shaped shell with the granular medium is 10% smaller than that of the rubber medium, and the process parts are also superior to the rubber medium. The buckling loads of the egg-shaped shell process parts with the granular medium are all higher than that of the rubber medium, and the buckling loads of the egg-shaped parts are slightly smaller than that of the rubber medium. However, taking into account the error of the egg-shaped shell flexible medium forming test, hydrostatic pressure test, and the overall buckling load distribution of the egg-shaped shell flexible medium forming process parts, it is considered that the overall strength of the egg-shaped shell with the granular medium is higher than that of the rubber medium.

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“…In recent years, owing to the large demand for civilian buildings, ocean engineering, military structures, and membrane structures [1,2], many large-span structures have been widely designed for public uses [3][4][5]. It is well known that those structures are generally light and flexible so they are sensitive to dynamic loads, such as wind loads, seismic loads, etc.…”

Section: Introductionmentioning

confidence: 99%

Vibration-Induced Pressures on a Cylindrical Structure Surface in Compressible Fluid

2019

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This paper unprecedentedly addresses the effect of vibrations of a cylindrical structure on dynamic pressures in a compressible and incompressible fluid situation. To obtain analytical solutions, the density of the fluid is simplified as a constant, but the rates of the density with respect to time and to space are considered as a dynamic and time-dependent function. In addition, the low velocity of the vibration is taken into account so the lower order terms are negligible. According to the assumption that the vibration at the boundary of the structure behaves as a harmonic function, some interesting and new analytical solutions can be established. Both analytical solutions in the cases of the compressible and incompressible fluid are rigorously verified by the calibrated numerical simulations. New findings reveal that, in the case of the incompressible fluid, dynamic pressure at the surface of the cylindrical shell is proportional to the acceleration of the vibration, which acts like an added mass. In the case of the compressible fluid, the pressure at the surface of the cylindrical structure is proportional to the velocity of the vibration, which acts as a damping. In addition, the proportional ratio is derived as ρ c .

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Effect of thickness on the buckling strength of egg-shaped pressure hulls

Cited by 24 publications

References 25 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

Study of plastic deformation and quality of flexible medium forming of bionic egg-shaped shell

Vibration-Induced Pressures on a Cylindrical Structure Surface in Compressible Fluid

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