Buckling of bi-segment spherical shells under hydrostatic external pressure

Zhang, Meng; Tang, Wenxian; Wang, Fang; Zhang, Jian; Cui, Weicheng; Chen, Yun

doi:10.1016/j.tws.2017.08.017

Cited by 35 publications

(12 citation statements)

References 18 publications

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“…In addition, since the contact forces in various cases using different impact velocities have the same shape function, the contact forces can thereby be descripted as Equation (15). Figure 17 shows the comparison of contact forces between the fitting results derived from Equation (15) and the numerical data. Excellent agreement can be established.…”

Section: Contact Force Principlementioning

confidence: 99%

“…Excellent agreement can be established. Besides, according to Equation (15), the skewness ratio can be derived theoretically as /2 s k  = = 1.57, which has a 7.6% discrepancy compared with the numerical value 1.70. Table 11.…”

Section: Contact Force Principlementioning

confidence: 99%

“…At the beginning, the initial state is the same between the cases of velocities of 2.8 m/s and 2.7 m/s when the pressure load and configuration of the shell are the same. According to Equation (15), the dynamics equation can be written in Equation (16) correspondingly, where K is the stiffness of the spherical shell. The relationship depends on the thickness, elastic modulus, and radius of the shell:…”

Section: Dynamic Buckling Criteriamentioning

confidence: 99%

“…The collisions can induce the damage of the submarine nose structure through the failure of components, and the unstable deformation or buckling of the spherical nose. The buckling behavior and buckling criterion of spherical shell structures subjected to collisions have attracted more research attention over recent years [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Contact Force Principlementioning

confidence: 99%

Section: Contact Force Principlementioning

confidence: 99%

Section: Dynamic Buckling Criteriamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…In order to withstand the internal high pressures, a storage tank is generally designed in a cylindrical [1][2][3][4][5][6][7], oval [8,9], or spherical [10] shape. This structure and shape affects the performance of the storage tank.…”

Section: Introductionmentioning

confidence: 99%

Structural Performance Optimization and Verification of an Improved Thin-Walled Storage Tank for a Pico-Satellite

Teng

Zhong-he

2017

Applied Sciences

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This paper presents an improved mesh storage tank structure obtained using 3D metal printing. The storage tank structure is optimized using a multi-objective uniform design method. Each parameter influencing the storage tank is considered as the optimization factor, and the compression stress (σ ), volume utilization ratio (v), and weight (m), are considered as the optimization objectives. Regression equations were established between the optimization factors and targets, the orders of the six factors affecting three target values are analyzed, and the relative deviations between the regression equation and calculation results for σ , v, and m were 9.72%, 4.15%, and 2.94%, respectively. The optimization results showed that the regression equations can predict the structure performance of the improved storage tank, and the values of the influence factors obtained through the optimization are effective. In addition, the compression stress was improved by 24.98%, the volume utilization ratio was increased by 26.86%, and the weight was reduced by 26.83%. The optimized storage tank was developed through 3D metal printing, and the compressive stress was improved by 58.71%, the volume utilization ratio was increased by 24.52%, and the weight was reduced by 11.67%.

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