CUED Publications database

Multistable Slit Caps

Sobota, P and Seffen, K (2016) Multistable Slit Caps. In: International Association for Shell and Spatial Strutures 2016 Tokyo - Spatial Structures in the 21st Century, 2016-9-26 to 2016-9-30, Tokyo, Japan.

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Multistable shells are structures that have more than one stable state of self-stress. We demonstrate for the first time that an initially stress-free, hemispherical cap with isotropic behaviour can gain at least three additional stable shapes and, hence, states of self-stress, if it is sliced partially along a given axi-symmetrical meridian. The usual initial and inverted configurations are only slightly affected by slicing. The other configurations are elicited by extra deformations about the inverted shape, which now performs a pre-stressing role. The experimental results are confirmed by finite-element simulations, and it is shown that initially rotationally symmetric structures can gain three stable configurations. Motivated by this, a simplified analytical approach using Foppl-von Karman plate theory is undertaken to analyse the bistable properties of shallow spherical segments. It is shown that the boundary conditions have a dominating influence on the occurrence of multistability.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Uncontrolled Keywords: Bistability multistability Nonlinear shells Föppl-von-Kármán plate theory large deflection shells snap-through buckling post-buckling analysis analytical solution
Divisions: Div D > Structures
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:05
Last Modified: 19 Jul 2018 08:06