Magneto-active elastic shells with tunable buckling strength
Abstract
Shell buckling is central in many biological structures and advanced functional materials, even if, traditionally, this elastic instability has been regarded as a catastrophic phenomenon to be avoided for engineering structures. Either way, predicting critical buckling conditions remains a long-standing challenge. The subcritical nature of shell buckling imparts extreme sensitivity to material and geometric imperfections. Consequently, measured critical loads are inevitably lower than classic theoretical predictions. Here, we present a robust mechanism to dynamically tune the buckling strength of shells, exploiting the coupling between mechanics and magnetism. Our experiments on pressurized spherical shells made of a magnetorheological elastomer demonstrate the tunability of their buckling pressure via magnetic actuation. We develop a theoretical model for thin magnetic elastic shells, which rationalizes the underlying mechanism, in excellent agreement with experiments. A dimensionless magneto-elastic buckling number is recognized as the key governing parameter, combining the geometrical, mechanical, and magnetic properties of the system.
Cite
@article{arxiv.2012.01163,
title = {Magneto-active elastic shells with tunable buckling strength},
author = {Dong Yan and Matteo Pezzulla and Lilian Cruveiller and Arefeh Abbasi and Pedro M. Reis},
journal= {arXiv preprint arXiv:2012.01163},
year = {2021}
}