Buckling failure analysis of PMMA spherical pressure hull

Liu, Di; Zhu, Haitao; Liu, Feng; Jia-qing, Cao; Ding, Zhongjun; Zhang, Yi

doi:10.1016/j.oceaneng.2021.110465

Cited by 9 publications

(4 citation statements)

References 12 publications

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“…In order to verify the validity of the estimation above and consider walnut samples with irregular shapes and uneven surfaces, uniaxial compression experiments using standard samples with different sizes were conducted with the help of the finite element method (FEM), as shown in Figure 10. Note that the standard sample was a spherical shell made out of polymethyl methacrylate (PMMA), which is the reason why the inside of the PMMA material is more uniform and has no pore structure and natural micro-cracks [33]. It should be emphasized that compared with the experimental methods (e.g., additive manufacturing), the spherical shell is easier to construct using finite element software ABAQUS 2022.…”

Section: Crack Bifurcation Coefficientmentioning

confidence: 99%

“…For the sake of simplicity, more details about the simulation method and progress, as well as parameter settings, can be referred to in Refs. [33,34].…”

Section: Crack Bifurcation Coefficientmentioning

confidence: 99%

“…Agriculture 2024, 14, x FOR PEER REVIEW 11 of 17 1 0 0.5 0.001 0.25 0.002 0.125 0.003 For the sake of simplicity, more details about the simulation method and progress, as well as parameter settings, can be referred to in Refs. [33,34]. Figure 11 shows the fracture energy of a spherical shell at different sizes.…”

Section: Plexiglas Properties Valuesmentioning

confidence: 99%

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Study on the Relationship between Crack Initiation and Crack Bifurcation in Walnut Shells Based on Energy

Man,

Li,

Zhang

et al. 2023

Agriculture

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Clarifying the dissipated energy required for crack expansion is an effective way to control material crushing. Therefore, based on the material fracture probability model and fractal theory, the energy range required for crack extension was determined, and the morphology of the cracks was quantified. This study investigates the influence of walnut size on crack propagation characteristics; this includes its effects on the crack initiation threshold energy, representing resistance to crack initiation, and the crack bifurcation threshold energy, representing resistance to crack bifurcation. The results show that crack extension has a well-defined threshold energy below which cracks do not initiate or bifurcate. The size of walnuts significantly impacts crack propagation characteristics, showing that both crack initiation threshold energy and crack bifurcation threshold energy decrease with increasing walnut sizes. In addition, there is a positive correlation function between the crack initiation threshold energy and the crack bifurcation threshold energy. The experimental results can offer fresh insights into material fracture prediction and serve as a reference for numerical simulations.

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Section: Crack Bifurcation Coefficientmentioning

confidence: 99%

“…For the sake of simplicity, more details about the simulation method and progress, as well as parameter settings, can be referred to in Refs. [33,34].…”

Section: Crack Bifurcation Coefficientmentioning

confidence: 99%

See 1 more Smart Citation

Study on the Relationship between Crack Initiation and Crack Bifurcation in Walnut Shells Based on Energy

Man,

Li,

Zhang

et al. 2023

Agriculture

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“…It is easier for the pressure-resistant spherical shell to establish the equilibrium equation in the spherical coordinate system. The maximum stress σ max is generated on the inner surface of the pressure-resistant spherical shell [27].…”

Section: Failure Theory For Intact Spherical Cabinmentioning

confidence: 99%

The Ultimate Strength of Fully Transparent Pressure-Resistant Spherical Cabins

Wang,

Li,

et al. 2023

Applied Sciences

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The fully transparent cabin used in a manned submersible is typically made of the viscoelastic material polymethyl methacrylate (PMMA). The pressure-bearing capacity of a PMMA-manned cabin was investigated considering the effects of initial geometrical imperfections and large openings. Three types of cabins were studied within the failure mode of nonlinear buckling, including an intact spherical cabin, a spherical cabin with a single opening, and a spherical cabin with double openings. The initial geometrical imperfection ranges from 0.1% to 0.5% of the inner diameter. The ultimate strength decreasing tendency for the different types of cabins with increasing initial imperfection was obtained and the thickness of the hatch cover determined based on the principle of equivalence differed its effects on the strength of the cabin. The influence of the hatch cover stiffness was not linear and indicated the necessity of exploring the coordinated design between the PMMA shell and the metal hatch cover for the transparent cabin.

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