Buckling of externally pressurised egg-shaped shells with variable and constant wall thicknesses

Zhang, Jian; Hua, Zhengdao; Tang, Wenxian; Wang, Fang; Wang, Shuyan

doi:10.1016/j.tws.2018.08.013

Cited by 32 publications

(3 citation statements)

References 44 publications

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“…Additionally, the lack of an extensive knowledge base for designing the process and necessary tools is a significant issue [27]. Rapid prototyping methods, such as additive manufacturing, can be employed to produce atypical shells of revolution directly from CAD models, such as corrugated [28,29], oval-shaped [30], and egg-shaped shells [31]. Additive manufacturing avoids many of the disadvantages of the traditional manufacturing process, such as producing metal dies, which is typically expensive and requires long manufacturing cycles and is therefore effective for producing small and complex parts.…”

Section: Introductionmentioning

confidence: 99%

Internal Hydroforming of Large Stainless-Steel Eggshells from Stepped Preforms

Tang

Zhang

Zhan

et al. 2023

Metals

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The internal hydroforming of large stainless-steel eggshells from a stepped preform is investigated in this paper. The nominal major and minor axes of the eggshell were 1537 and 1070 mm, respectively. The stepped preform was fabricated from thin-walled (1.9 mm thick) stainless-steel sheets and comprised twelve conical segments inscribed inside the target eggshell. The preform was then hydroformed, and its wall thickness and shape were measured. The yield load distribution and material hardening of the hydroforming process were investigated analytically. Nonlinear finite-element analyses were employed to further investigate hydroforming behaviors and the effect of weld lines on hydroforming. The experimental, numerical, and analytical results were consistent. The results confirm that, during the hydroforming process, considerable springback occurs for large eggshells, which greatly affects forming precision. However, this effect can be reduced by accounting for the strengthening effect of weld lines.

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Section: Introductionmentioning

confidence: 99%

Internal Hydroforming of Large Stainless-Steel Eggshells from Stepped Preforms

Tang

Zhang

Zhan

et al. 2023

Metals

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“…Very interesting works, which concern the buckling phenomena of the egg-shaped shells subjected to external pressure, were presented by Zhang and his colleagues [25][26][27]. In the first work, the influence of the geometrical dimensions on the critical buckling load was investigated.…”

Section: Introductionmentioning

confidence: 99%

Parametric Optimization of Isotropic and Composite Axially Symmetric Shells Subjected to External Pressure and Twisting

et al. 2021

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The present paper is devoted to the problem of the optimal design of thin-walled composite axially symmetric shells with respect to buckling resistance. The optimization problem is formulated with the following constraints: namely, all analyzed shells have identical capacity and volume of material. The optimization procedure consists of four steps. In the first step, the initial calculations are made for cylindrical shells with non-optimal orientation of layers and these results are used as the reference for optimization. Next, the optimal orientations of layers for cylindrical shapes are determined. In the third step, the optimal geometrical shape of a middle surface with a constant thickness is determined for isotropic material. Finally, for the assumed shape of the middle surface, the optimal fiber orientation angle θ of the composite shell is appointed. Such studies were carried for three cases: pure external pressure, pure twisting, and combined external pressure with twisting. In the case of shells made of isotropic material the obtained results are compared with the optimal structure of uniform stability, where the analytical Shirshov’s local stability condition is utilized. In the case of structures made of composite materials, the computations are carried out for two different materials, where the ratio of E1/E2 is equal to 17.573 and 3.415. The obtained benefit from optimization, measured as the ratio of critical load multiplier computed for reference shell and optimal structure, is significant. Finally, the optimal geometrical shapes and orientations of the layers for the assumed loadings is proposed.

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“…de Faria and de Almeida (2003) and Le-Manh et al (2017) studied buckling of composite plates with variable thickness. Zhang et al (2018) studied buckling of egg-shaped shells with variable thickness under external pressure loads. However, no studies on the ultimate strength of isotropic plate panels with variable or nonuniform thickness are found in the literature.…”

Section: Introductionmentioning

confidence: 99%

Ultimate Compressive Strength Computational Modeling for Stiffened Plate Panels with Nonuniform Thickness

Lee

Paik

2020

J. Marine. Sci. Appl.

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The aim of this paper is to develop computational models for the ultimate compressive strength analysis of stiffened plate panels with nonuniform thickness. Modeling welding-induced initial deformations and residual stresses was presented with the measured data. Three methods, i.e., ANSYS finite element method, ALPS/SPINE incremental Galerkin method, and ALPS/ULSAP analytical method, were employed together with existing test database obtained from a full-scale collapse testing of steel-stiffened plate structures. Sensitivity study was conducted with varying the difference in plate thickness to define a representative (equivalent) thickness for plate panels with nonuniform thickness. Guidelines are provided for structural modeling to compute the ultimate compressive strength of plate panels with variable thickness.

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Buckling of externally pressurised egg-shaped shells with variable and constant wall thicknesses

Cited by 32 publications

References 44 publications

Internal Hydroforming of Large Stainless-Steel Eggshells from Stepped Preforms

Internal Hydroforming of Large Stainless-Steel Eggshells from Stepped Preforms

Parametric Optimization of Isotropic and Composite Axially Symmetric Shells Subjected to External Pressure and Twisting

Ultimate Compressive Strength Computational Modeling for Stiffened Plate Panels with Nonuniform Thickness

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