A phantom-chain based viscoplastic model for local relaxation of magneto-active polymer composites under dynamic magnetic field

IF 5.7 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY
Li Zhang , Ran Tao , Yiqi Mao , Shujuan Hou
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引用次数: 0

Abstract

Magneto-active polymer composites (MAPCs) can change their mechanical properties (i.e., stiffness) and/or mechanical deformation upon an external magnetic stimulus. The mechanical response of MAPCs is primarily determined by the interaction between the polymer matrix and magnetic particles, alongside the performance of the constituent materials. When a directional dynamic magnetic field is applied, mainly two types of relaxation behavior occur due to magnetic particle oscillations and rotations, i.e., heat-generation caused phase change and viscosity reduction, and chain cleavage and de-adhesion from particles. This material relaxation caused by local chain debonding is fundamentally different from that by the phase transition characterized with variation of free volumes. This work proposes a phantom-chain based magnetomechanical model to reflect magnetic particles oscillating caused local material relaxation, and a Maxwell rheological model is superimposed to capture the heat-triggered relaxation behavior of MAPCs under dynamic magnetic field. Considering changes in the chain configuration, a phantom-chain model is constructed by wave-propagation modeling and further integrated through full network space to capture the overall magnetomechanical properties of MAPCs. The magnetic field triggered heat-generation is simulated by both Brownian relaxation and Neel relaxation. The model is calibrated through a series of tests and then applied in simulations of the isothermal uniaxial tension of MAPCs, both with and without external magnetic fields. These simulations show the model's effectiveness in capturing the material relaxation behavior of MAPCs under dynamic magnetic activation. Good agreement between the simulations and experiments demonstrates the validation and effectiveness of the proposed model and solution procedure. The calibrated model is further applied to the multi-cycle shape memory modeling of MAPCs under the alternating magnetic field. This work lays a theoretical foundation and contributes to the design and widespread application of 3D complex microstructured MAPCs.
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来源期刊
International Journal of Engineering Science
International Journal of Engineering Science 工程技术-工程:综合
CiteScore
11.80
自引率
16.70%
发文量
86
审稿时长
45 days
期刊介绍: The International Journal of Engineering Science is not limited to a specific aspect of science and engineering but is instead devoted to a wide range of subfields in the engineering sciences. While it encourages a broad spectrum of contribution in the engineering sciences, its core interest lies in issues concerning material modeling and response. Articles of interdisciplinary nature are particularly welcome. The primary goal of the new editors is to maintain high quality of publications. There will be a commitment to expediting the time taken for the publication of the papers. The articles that are sent for reviews will have names of the authors deleted with a view towards enhancing the objectivity and fairness of the review process. Articles that are devoted to the purely mathematical aspects without a discussion of the physical implications of the results or the consideration of specific examples are discouraged. Articles concerning material science should not be limited merely to a description and recording of observations but should contain theoretical or quantitative discussion of the results.
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