Numerical and experimental analysis of buckling of hemisphere shell made by spinning forming method subjected to uniform external pressure

Document Type : Research Article

Authors

1 شهید بهشتی-مهندسی مکانیک و انرژی

2 Applied Design Department, Faculty of Mechanical Engineering, Malek Ashtar University of Technology, Iran.

3 Faculty of Mechanical & Energy Engineering,Shahid Beheshti University

Abstract

The spherical shell is an ideal geometry for use in pressure vessels under uniform external pressure. The collapse pressure of these types of shells is much lower than its theoretical value due to the high sensitivity to imperfections and the yield stress of the material. Since the imperfections depend on the sheet metal forming method, it is necessary to investigate the effect of the fabrication method on the collapse pressure. This article is focused on the experimental and numerical study of the buckling of hemispherical shells made by the spinning forming method. The most important problem of this method is the lack of control over the thickness. In this method, the imperfections are axially symmetrical, which is one of the advantages of this method.  In this article, buckling analysis due to both diameter and thickness variations is done separately and simultaneously. It has been shown that thickness variations in rotational forming should be considered in the analysis of shell collapse. Also, by comparing the numerical and experimental results shown with the help of quadratic volume elements, thickness changes, and boundary conditions can be applied with higher reliability compared to the shell element.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 55, Issue 6
September 2023
Pages 759-772

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