Buckling performance of egg-shaped shells fabricated through free hydroforming

Zhang, Jian; Dai, Mingqiang; Wang, Fang; Tang, Wenxian; Zhao, Xilu

doi:10.1016/j.ijpvp.2021.104435

Cited by 19 publications

(16 citation statements)

References 37 publications

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“…Then, experimental and numerical study of non-linear hydroforming and mechanical properties was done. The experimental results are shown to be in good agreement with the analytical results [1][2].…”

Section: Introductionsupporting

confidence: 77%

Experimental Bulging and Buckling of Bi-segmented Cylinders

Wang

Zhang

Zuo

et al. 2022

J. Phys.: Conf. Ser.

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This paper studies the experimental free bulging and buckling of bi-segmented cylinders. Two cylindrical shells are manufactured using argon-arc welding and analyzed for manufacturing errors. Next, free bulging tests and hydrostatic pressure tests are conducted to verify the feasibility of the free bulging technique and to confirm the destruction form of the bulged bi-segmented barrel. At the same time, the reasonableness of the circular thick plate is examined, which is determined according to the deformation consistency. The results show that the bi-segmented cylindrical preforms exhibit good welding quality by TIG welding technology. It has the same critical pressure load as a single cylindrical preform. Nevertheless, the bi-segmented cylindrical preforms have larger internal volume and better buoyancy capability than the single cylindrical preform. The free bulging bi-segmented shell has good symmetry along the axial direction. It has larger internal volume and higher critical buckle capacities than the non-bulging one.

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Section: Introductionsupporting

confidence: 77%

Experimental Bulging and Buckling of Bi-segmented Cylinders

Wang

Zhang

Zuo

et al. 2022

J. Phys.: Conf. Ser.

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“…It is these geometrical and mechanical properties that have facilitated its increasing use in engineering solutions, specifically applied to designing thin-walled shells. Results of numerous studies of these structures ( Lazarus et al, 2012 ; Zhang et al, 2017a , b , 2019 , 2021 , 2022 ; Guo et al, 2020 have highlighted these beneficial characteristics, i.e., high loading capacity, efficient space utilization, amazing weight-to-strength ratio, proper span-to-thickness ratio and streamlined forms.…”

Section: Introductionmentioning

confidence: 99%

“…Despite fairly extensive research in this field for ∼70 years (e.g., Preston, 1953 ; Carter, 1968 ; Todd and Smart, 1984 ; Smart, 1991 ; Baker, 2002 ; Troscianko, 2014 ; Biggins et al, 2018 ; Pike, 2019 ), the Narushin’s ( Narushin, 2001b ) and Hügelschäffer’s ( Petrović and Obradović, 2010 ; Petrović et al, 2011 ; Obradović et al, 2013 ) models have recently gained the most attention. While the former is thought to be more applicable in thin-walled shell structures ( Zhang et al, 2017a ; b , 2019 , 2021 , 2022 ), the latter has been more adapted to architectural and construction design ( Petrović et al, 2011 ; Maulana et al, 2015 ).…”

Section: Introductionmentioning

confidence: 99%

Egg-inspired engineering in the design of thin-walled shelled vessels: a theoretical approach for shell strength

Narushin¹,

Romanov

Griffin

2022

Front. Bioeng. Biotechnol.

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A novel subdiscipline of bionics is emerging in the form of ‘egg-inspired engineering’ through the use of egg-shaped ovoids as thin-walled tanks and building structures. Hügelschäffer’s and Narushin’s models of egg geometry are highly applicable within this proposed subdiscipline. Here we conducted a comparative analysis between the two models with respect to some of the most important egg parameters. These included contents volume, shell volume, and the location of the neutral axis along the shell thickness. As a first step, theoretical studies using the Narushin’s model were carried out due to the lack (or limited amount) of data on the geometric relationships of parameters and available calculation formulae. Considering experimental data accumulated in the engineering and construction industries, we postulate a hypothesis that there is a correlation between location of the neutral axis and the strength of the walls in the egg-shaped structure. We suggest that the use of Narushin’s model is preferable to Hügelschäffer’s model for designing thin-walled shelled vessels and egg-shaped building structures. This is due to its relative simplicity (because of the requirement for only two initial parameters in the basic equation), optimal geometry in terms of material costs per unit of internal capacity, and effective prerequisites for shell strength characteristics.

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“…In a recent study, this process has been used to fabricate complex egg shell-shaped submarine hulls which can support extreme pressure under water. 7 In another study, this process was successfully used to fabricate large size tubular components of 5A06 material with rectangular cross-section. 8 Apart from fabricating bulk components, this process can also be used to fabricate components from blanks of lower thickness.…”

Section: Introductionmentioning

confidence: 99%

Punch-less and die-less sheet hydroforming process for manufacturing of serpentine-shaped micro-channels in ultra-thin sheets

Sudarsan

Panda

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the present work, novel serpentine-shaped micro-channels were successfully fabricated in ultra-thin sheets of AA1050, C101, and SS304 materials using the sheet hydroforming (SHF) process. In-house fabrication methods, namely punch-less SHF and die-less SHF processes were designed and developed on a 20-t press to manufacture these channels. The finite element (FE) modeling of both processes was developed for the prediction of the deformation behavior of these sheets. The elasto-plastic FE models incorporated the elastic properties, Barlat 89 anisotropic yield model, and Hollomon hardening law for all the three sheets, and their corresponding forming limit diagrams (FLDs) were implemented as damage criteria. It was observed that the maximum pressure was 28 MPa and 32 MPa for the punch-less and die-less SHF process, respectively. The manufacturability of the hydroformed channels was examined through channel depth, aspect ratio, and thickness distribution. The average channel depth and aspect ratio were found to be higher in the case of the die-less SHF compared to punch-less SHF. The failure occurred in the AA1050 channel under plane strain deformation mode near the die corner region and punch corner region for punch-less and die-less SHF processes, respectively, indicated by a sudden dip in the thickness distribution profile. Moreover, the surface quality of the formed channels was investigated through surface roughness value, and this was further correlated with effective plastic strain incurred in the deformation process. It was observed that the surface roughness of the deformed channels fabricated by the punch-less SHF process was lower than those formed through the die-less SHF process in the present study.

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Buckling performance of egg-shaped shells fabricated through free hydroforming

Cited by 19 publications

References 37 publications

Experimental Bulging and Buckling of Bi-segmented Cylinders

Experimental Bulging and Buckling of Bi-segmented Cylinders

Egg-inspired engineering in the design of thin-walled shelled vessels: a theoretical approach for shell strength

Punch-less and die-less sheet hydroforming process for manufacturing of serpentine-shaped micro-channels in ultra-thin sheets

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