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J. Blachut, M.D. White, "Influence of Material and Shape Imperfections on Buckling of Externally Pressurized Auxetic Domes", in P. Iványi, J. Kruis, B.H.V. Topping, (Editors), "Proceedings of the Eighteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 10, Paper 13.1, 2025,

Keywords: mechanical metamaterials, auxetics, negative Poisson’s ratio, elastic-plastic, external pressure, buckling, imperfections.

Abstract

This study offers a very first insight into the influence of imperfections on buckling of: (i) single-layer auxetic, and (ii) two-layer (steel–auxetic), shell subjected to external pressure. For the first case: modulated eigen-affine imperfections show little difference between Poisson’s ratio of 0.3, and negative Poisson’s ratio of -0.5. The same proved to be true for a localised inward, Force-Induced-Dimple, (FID). Significant variations in the localised wall thickness of auxetic layer resulted only in minute drop of buckling pressure. The same became true for localised, large perturbation in the magnitude of negative Poisson’s ratio. For the case two, the wall thickness was made half steel and halve auxetic. The shell with Poisson’s 0.3 and -0.5, shows markedly larger sensitivity when compared with results obtained for Poisson’s equal to 0.3 in both layers, i.e., on a like-for-like basis this shell is less safe. This is true for both eigen-affine imperfections as well as for Force-Induced-Dimple.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 10 PROCEEDINGS OF THE EIGHTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: P. Iványi, J. Kruis and B.H.V. Topping Paper 13.1 Influence of Material and Shape Imperfections on Buckling of Externally Pressurized Auxetic Domes J. Blachut and M.D. White Department of Mechanical and Aerospace Engineering, University of Liverpool, United Kingdom Full Bibliographic Reference for this paper J. Blachut, M.D. White, "Influence of Material and Shape Imperfections on Buckling of Externally Pressurized Auxetic Domes", in P. Iványi, J. Kruis, B.H.V. Topping, (Editors), "Proceedings of the Eighteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 10, Paper 13.1, 2025, Keywords: mechanical metamaterials, auxetics, negative Poisson’s ratio, elastic-plastic, external pressure, buckling, imperfections. Abstract This study offers a very first insight into the influence of imperfections on buckling of: (i) single-layer auxetic, and (ii) two-layer (steel–auxetic), shell subjected to external pressure. For the first case: modulated eigen-affine imperfections show little difference between Poisson’s ratio of 0.3, and negative Poisson’s ratio of -0.5. The same proved to be true for a localised inward, Force-Induced-Dimple, (FID). Significant variations in the localised wall thickness of auxetic layer resulted only in minute drop of buckling pressure. The same became true for localised, large perturbation in the magnitude of negative Poisson’s ratio. For the case two, the wall thickness was made half steel and halve auxetic. The shell with Poisson’s 0.3 and -0.5, shows markedly larger sensitivity when compared with results obtained for Poisson’s equal to 0.3 in both layers, i.e., on a like-for-like basis this shell is less safe. This is true for both eigen-affine imperfections as well as for Force-Induced-Dimple. download the full-text of this paper (PDF, 10 pages, 585 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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