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(searched for: doi:10.1016/j.ijpvp.2018.02.003)
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Zhanhui Wang, Zhifang Zhang, Jinzhong Chen, Jinjun Bai
Published: 25 November 2021
Scientific Reports, Volume 11, pp 1-12; https://doi.org/10.1038/s41598-021-02397-7

Abstract:
As the main pressure components of pressure vessels, the mechanical performance of cylinders and heads affects the normal operation of pressure vessels. At present, no unified theoretical formula exists for the connection region between an elliptical head and the cylinder. Therefore, the authors consider the standard elliptical head as the research object. First, the theoretical stress calculation formula is deduced according to the deformation continuity equation. Second, the stress is experimentally measured using an internal-pressure thin-walled-vessel stress measurement device, and the theoretical and experimental stress values in the discontinuous region between the elliptical head and cylinder are analysed and compared to verify the accuracy and applicability of the theoretical stress calculation formula. The results show that the theoretical stress calculation formula in the discontinuous region between the elliptical head and cylinder is valid. By comparing and analysing the theoretical and experimental stress values, the accuracy and applicability of the theoretical stress calculation formula in the discontinuous region are verified. The findings can provide guidance for the stress measurement of internal-pressure vessels.
, Keming Li
New Theory and Design of Ellipsoidal Heads for Pressure Vessels pp 1-34; https://doi.org/10.1007/978-981-16-0467-6_1

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Zhaohua Huang, , Chenhui Jia, Xianqing Lei, Zhuangya Zhang, Zhenyu Ma
International Journal of Pressure Vessels and Piping, Volume 192; https://doi.org/10.1016/j.ijpvp.2021.104398

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Jian Zhang, Zhenyang Zhu, , Xilu Zhao, YongMei Zhu
Published: 3 February 2021
Thin-Walled Structures, Volume 161; https://doi.org/10.1016/j.tws.2021.107485

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Jinyang Zheng, Yehong Yu, Yehong Chen, Keming Li, Zekun Zhang, Wenzhu Peng, ,
Journal of Pressure Vessel Technology, Volume 143; https://doi.org/10.1115/1.4048099

Abstract:
Ellipsoidal and torispherical heads, whose geometric shapes are close, are usually used as end closures of internally pressurized vessels. In pressure vessel codes, for example, ASME BPVC Section VIII and EN13445-3, ellipsoidal heads are designed as torispherical heads using geometric equivalency approaches. However, the difference between ellipsoidal and equivalent torispherical heads has not been studied in detail. In this paper, we first investigate shape deviation between the two types of heads. Then we compare elastic–plastic behaviors between ellipsoidal and equivalent torispherical heads as well as their failure modes, i.e., buckling and plastic collapse (bursting). It is found that ellipsoidal heads have more buckling resistance than equivalent torispherical heads, indicating that the current design rules for buckling of ellipsoidal heads based on the geometric equivalency approaches result in uneconomical design. In addition, experimental and numerical results show that such heads experience geometric strengthening. The finite element (FE) method considering the effect of geometric strengthening provides a good prediction of plastic collapse pressure. However, the current design equation for bursting does not consider the effect of geometric strengthening, also leading to uneconomical design. Therefore, in order to avoid uneconomical design, we recommend that (1) with respect to buckling of ellipsoidal heads, a new design equation be proposed rather than implementing the geometric equivalency approaches, and (2) the current design equation for bursting be deleted, and a new design equation, considering the effect of geometric strengthening, be proposed for bursting of ellipsoidal and torispherical heads.
Jian Zhang, Xin Wang, Wenxian Tang, , YongMei Zhu
Ships and Offshore Structures pp 1-17; https://doi.org/10.1080/17445302.2020.1745546

Abstract:
The purpose of this paper is to elaborate the non-linear collapse of externally pressurized resin toroidal and cylindrical shells, along with a comparison between a toroid and cylinder. For this purpose, the collapse characteristics, critical loads, and imperfection sensitivities of volume equivalent shells were numerically evaluated for the first eigenmode imperfection. Furthermore, three nominally identical toroidal shells and three equivalent cylindrical shells were rapidly prototyped, optically scanned, ultrasonically measured, hydrostatically tested, and numerically examined. The numerical and experimental data were consistent with each other. The average pressure supporting capacity of the toroidal shell was approximately 29% higher than that of its volume equivalent cylindrical shell, thus demonstrating a superior pressure supporting capacity of the toroid. The knock down factors of the cylindrical shell were considerably lower than those of the toroidal shell, thus indicating that the toroidal shell is considerably less sensitive to initial geometrical imperfection than the cylindrical shell.
Yueyang Wang, , Wenxian Tang
Journal of Marine Science and Application, Volume 19, pp 96-100; https://doi.org/10.1007/s11804-020-00125-7

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Masoud Mohammadi, Mostafa Bamdad, Kazem Alambeigi, Rossana Dimitri,
Published: 12 June 2019
Composite Structures, Volume 225; https://doi.org/10.1016/j.compstruct.2019.111119

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K. Li, , S. Liu, H. Ge, G. Sun, Z. Zhang, C. Gu, P. Xu
Published: 24 April 2019
Thin-Walled Structures, Volume 141, pp 260-274; https://doi.org/10.1016/j.tws.2019.04.031

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, Yueyang Wang, Wenxian Tang, YongMei Zhu, Xilu Zhao
Published: 29 December 2018
Thin-Walled Structures, Volume 136, pp 129-137; https://doi.org/10.1016/j.tws.2018.12.005

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, Yang Du, Zhiping Chen, Shaojing Hou
International Journal of Pressure Vessels and Piping, Volume 169, pp 170-176; https://doi.org/10.1016/j.ijpvp.2018.12.009

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