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Searching for Imperfection Insensitive Externally Pressurized Near-Spherical Thin Shells

Ning, Xin and Pellegrino, Sergio (2018) Searching for Imperfection Insensitive Externally Pressurized Near-Spherical Thin Shells. Journal of the Mechanics and Physics of Solids, 120 . pp. 49-67. ISSN 0022-5096. http://resolver.caltech.edu/CaltechAUTHORS:20180615-091650052

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Abstract

This paper studies the buckling behavior and imperfection sensitivity of geodesic and stellated shells subject to external pressure. It is shown that these structures can completely eliminate the severe imperfection sensitivity of spherical shells and can achieve buckling pressure and mass efficiency higher than the perfect sphere. Key results of this paper are as follows. First, a shell with the shape of an icosahedron can carry external pressure significantly higher than a spherical shell, when the effects of geometric imperfections are considered. Second, stellated shells are generally insensitive to imperfections. For pyramids with height-to-radius ratios greater than 35% the buckling pressure is greater than for a perfect sphere. The specific ratio 45% gives the highest buckling pressure, 28% higher than the perfect sphere. Third, stellated icosahedra with concave pyramids have higher mass efficiency than the perfect sphere. Fourth, in terms of volume efficiency, geodesic shells are comparable to spherical shells with a knockdown factor of 0.2 and convex stellated shells are comparable to spherical shells with a knockdown factor of 0.65.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.jmps.2018.06.008DOIArticle
ORCID:
AuthorORCID
Ning, Xin0000-0002-9432-3665
Pellegrino, Sergio0000-0001-9373-3278
Additional Information:© 2018 Elsevier. Received 10 September 2017, Revised 24 May 2018, Accepted 6 June 2018, Available online 15 June 2018.
Subject Keywords:Spherical Shells; Buckling; Imperfection Sensitivity
Record Number:CaltechAUTHORS:20180615-091650052
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180615-091650052
Official Citation:Xin Ning, Sergio Pellegrino, Searching for imperfection insensitive externally pressurized near-spherical thin shells, Journal of the Mechanics and Physics of Solids, Volume 120, 2018, Pages 49-67, ISSN 0022-5096, https://doi.org/10.1016/j.jmps.2018.06.008. (http://www.sciencedirect.com/science/article/pii/S0022509617308050)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87149
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:15 Jun 2018 16:23
Last Modified:26 Jul 2018 21:45

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