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Nonlinear dynamics of shape memory alloys actuated bistable beams

Zhang, Jiaying, Wu, Zhangming, Zhang, Chen, Hao, Hao, Rui, Nie and Jinhao, Qiu 2019. Nonlinear dynamics of shape memory alloys actuated bistable beams. Smart Materials and Structures 28 , 055009. 10.1088/1361-665X/ab0325
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Abstract

The phenomenon of bi-stable behaviour has been widely used in the structural design, as it can provide large deformation by switching between two stable equilibrium positions. This paper aims to investigate the intrinsic nonlinear dynamic characteristics of an actively controlled bistable beam using a simplified spring-mass model. The dynamic model for an active (heated) SMA wire driven bistable beam is established based on a polynomial constitutive equation to describe the thermomechanical behaviour of the shape memory alloy. The actively controlled bistable beams are designed, fabricated and experimentally tested to achieve the morphing behaviour snapping-through form one position to another. The results obtained from the experimental testing and the theoretical simulation are compared to validate the proposed model. Dynamic behavior of the proposed SMA wires actuated bistable beam under varying external excitation is investigated to show the influence of the thermomechanical loadings. Analysis of the experimental data and simulation results shows that the SMA wires actuated bistable structure can be well-performed for the bistable switching. It also approved that the different behaviours of the system, including periodic responses, complex responses and chaos can be accurately predicted using the proposed simplified model.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TJ Mechanical engineering and machinery
Publisher: IOP Publishing
ISSN: 0964-1726
Date of First Compliant Deposit: 28 February 2019
Date of Acceptance: 30 January 2019
Last Modified: 16 May 2019 15:40
URI: http://orca.cf.ac.uk/id/eprint/119788

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