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Research on Two-Step Hydro-Bulge Forming of ellipsoidal shell with Larger Axis Length Ratio

Journal of Harbin Institute of Technology(New Series) 2013年第3期20卷 93-98页

作者： Shi-Jian Yuan Lan Hu Zhu-Bin He Bu-Gang Teng Zhong-Ren Wang National Key Laboratory of Precision Hot Processing of Metals Harbin Institute of Technology Shanghai Aerospace Equipments Manufacturer

The two-step hydro-bulge forming technique was proposed to manufacture the ellipsoidal shell with the length ratio of the long axis to the short axis larger than 1.4. A central tube was introduced into the first step of the hydro-bulge forming process to constrain the over growth of the short axis during bulging,and then the central tube was replaced with two polar plates in the second step of the hydro-bulge forming process to manufacture an integral ellipsoidal shell. It is shown that the central tube restricts the growth of the short axis and simultaneously reduces the shrunk tendency of the long axis. The wrinkling occurs due to the latitudinal compressive stress at the equator at the early stage of hydro-bulge forming. However,with the increase of internal pressure,the compressive stress areas gradually decrease and finally the tensile latitudinal stress occupies approximately the whole shell,thus the wrinkles are eliminated. A sound ellipsoidal shell with the axis length ratio of 1.8 is obtained after two-step hydro bulging.

关键词： hydro-bulge forming ellipsoidal shell latitudinal stress wrinkling axis length ratio

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Full Discretization Scheme for the Dynamics of Elliptic Membrane shell Model

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Communications in Computational Physics 2021年第1期29卷 186-210页

作者： Xiaoqin Shen Qian Yang Lin Bai Kaitai Li Department of Mathematics School of SciencesXi’an University of TechnologyXi’an710054ShaanxiChina School of Mathematics and Statistics Xi’an Jiaotong UniversityXi’an710049ShaanxiChina

In this study,the dynamics of elliptic membrane shell model has been proposed and discussed numerically for the first ***,we show that the solution of this model exists and is ***,we consider spatial and time discretizations of the time-dependent elliptic membrane shell by finite element method and Newmark scheme,***,the corresponding existence,uniqueness,stability,convergence and a priori error estimate are ***,we present numerical results involving a portion of an ellipsoidal shell and a portion of a spherical shell to verify the efficiency and convergence of the numerical scheme.

关键词： Elliptic membrane shell finite element method full discretization ellipsoidal shell spherical shell

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