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Eversion of bistable shells under magnetic actuation: A model of nonlinear shapes

Published version
Peer-reviewed

Repository DOI


Type

Article

Change log

Authors

Seffen, KA 
Vidoli, S 

Abstract

We model in closed form a proven bistable shell made from a magnetic rubber composite material. In particular, we incorporate a non-axisymmetrical displacement field, and we capture the nonlinear coupling between the actuated shape and the magnetic flux distribution around the shell. We are able to verify the bistable nature of the shell and we explore its eversion during magnetic actuation. We show that axisymmetrical eversion is natural for a perfect shell but that non-axisymmetrical eversion rapidly emerges under very small initial imperfections, as observed in experiments and in a computational analysis. We confirm the non-uniform shapes of shell and we study the stability of eversion by considering how the landscape of total potential and magnetic energies of the system changes during actuation.

Description

Keywords

bistable, shell, magnetic, actuation, eversion

Journal Title

Smart Materials and Structures

Conference Name

Journal ISSN

0964-1726
1361-665X

Volume Title

25

Publisher

IOP