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http://dx.doi.org/10.1016/j.ijnaoe.2017.02.003

Influence of initial imperfections on ultimate strength of spherical shells  

Yu, Chang-Li (School of Naval Architecture and Ocean Engineering, Harbin Institute of Technology)
Chen, Zhan-Tao (School of Naval Architecture and Ocean Engineering, Harbin Institute of Technology)
Chen, Chao (School of Naval Architecture and Ocean Engineering, Harbin Institute of Technology)
Chen, Yan-ting (School of Naval Architecture and Ocean Engineering, Harbin Institute of Technology)
Publication Information
International Journal of Naval Architecture and Ocean Engineering / v.9, no.5, 2017 , pp. 473-483 More about this Journal
Abstract
Comprehensive consideration regarding influence mechanisms of initial imperfections on ultimate strength of spherical shells is taken to satisfy requirement of deep-sea structural design. The feasibility of innovative numerical procedure that combines welding simulation and non-linear buckling analysis is verified by a good agreement to experimental and theoretical results. Spherical shells with a series of wall thicknesses to radius ratios are studied. Residual stress and deformations from welding process are investigated separately. Variant influence mechanisms are discovered. Residual stress is demonstrated to be influential to stress field and buckling behavior but not to the ultimate strength. Deformations are proved to have a significant impact on ultimate strength. When central angles are less than critical value, concave magnitudes reduce ultimate strengths linearly. However, deformations with central angles above critical value are of much greater harm. Less imperfection susceptibility is found in spherical shells with larger wall thicknesses to radius ratios.
Keywords
Ultimate strength; Spherical shells; Residual stress; Initial imperfections; Submersibles;
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