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Title: Non-contact actuated snap-through buckling of a pre-buckled bistable hard-magnetic elastica
Authors: Zhang, Yingchao
Ma, Yinji
Yu, Jing
Gao, Huajian
Keywords: Engineering::Mechanical engineering
Issue Date: 2023
Source: Zhang, Y., Ma, Y., Yu, J. & Gao, H. (2023). Non-contact actuated snap-through buckling of a pre-buckled bistable hard-magnetic elastica. International Journal of Solids and Structures, 281, 112413-.
Project: NRF-NRFF11-2019-0004 
Journal: International Journal of Solids and Structures
Abstract: Snap-through buckling of bistable structures is a classic topic in mechanics which has been widely studied and applied in various fields such as mechanical meta-materials and soft robotics. Obstacles that hinder broader applications of conventional bistable structures include the requirement of contact actuation to trigger instability and difficulty to control post-buckling configurations. In contrast, hard magnetic elastica (HME), a composite made of hard ferromagnetic particles and soft elastomer that deforms in response to an externally applied magnetic field, exhibits great potential to bring major advances in this field by allowing non-contact actuation and programmable control of snap-through buckling via magnetization distribution (M−distribution). Here, we develop a theoretical framework to trace the instability and post-buckling evolution process of snap-through buckling of a bistable HME. In contrast to the conventional snapping through end-end shortening, the design space for bistable HME includes two key parameters: the remanent magnetization density after pre-magnetization and the external magnetic field. We focus on two simple yet practical cases: a fixed amplitude of magnetization density along the HME with direction reversed at the magnetization interface (M−interface), and a uniform magnetic field with varied direction. We identify an optimal position for the single M−interface and direction for the uniform actuation field for pre-buckled beams with two-ends fixed, which can reduce the required actuation field for snapping to nearly half in comparison with the symmetric cases. Experiments and finite element analysis are performed to validate the model predictions. Our work may stimulate further studies on utilizing snap-through buckling in applications where fast and large shape transitions from one stable state to another can be actuated in a low-energy, non-contact mode through a remotely applied stimulus field.
ISSN: 0020-7683
DOI: 10.1016/j.ijsolstr.2023.112413
Schools: School of Mechanical and Aerospace Engineering 
School of Materials Science and Engineering 
Organisations: Institute of High Performance Computing, A*STAR
Research Centres: Institute for Digital Molecular Analytics and Science
Rights: © 2023 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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