开发用于双向可变刚度应用的预磁化磁流变弹性体

IF 3.7 3区 材料科学 Q1 INSTRUMENTS & INSTRUMENTATION Smart Materials and Structures Pub Date : 2024-08-29 DOI:10.1088/1361-665x/ad7003
Choonghan Lee, Woosoon Yim
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引用次数: 0

摘要

磁流变弹性体(MRE)是一种利用铁磁性颗粒之间的磁力在外部磁场下产生可变刚度和阻尼的材料。然而,传统的磁流变弹性体在暴露于外部磁场时在实现降低刚度方面存在局限性。为了满足刚度快速双向变化的需求,本研究提出了一种新方法--预磁化 MRE,使用永久磁化的铁磁性颗粒代替外部永久磁铁作为磁偏压。预磁化 MRE 由硅涂层钕合金颗粒和硅树脂弹性体制成,对设计参数进行了全面研究,包括硅树脂的选择、颗粒厚度、尺寸和重量比。考虑到磁化颗粒之间的作用力和弹性体的超弹性,研究通过模拟探索了预磁化的方向性影响。实验研究包括测量不同磁化方向下不同剪切应变的剪切模量。结果凸显了树脂类型、颗粒大小和重量比对磁流变(MR)效应的影响。此外,还开发了一个应用测试平台,用于评估各种芯材刚度的双向变化。研究揭示了磁流变效应/响应时间与磁芯材料的磁导率以及磁芯与磁化颗粒之间的吸引力和排斥力之间的相关性。观察结果表明,不同磁芯材料的磁共振效应在 0.08% 到 0.25% 之间,正向电流和反向电流的响应时间分别为 40 毫秒和 46 毫秒。这些发现为优化预磁化 MRE 的设计和性能,增强工程应用中的双向刚度控制提供了宝贵的见解。
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Development of pre-magnetized magnetorheological elastomer for bidirectionally variable stiffness applications
Magnetorheological elastomers (MREs) are materials that leverage magnetic forces among ferromagnetic particles to induce variable stiffness and damping under external magnetic fields. However, conventional MREs have limitations in achieving reduced stiffness when exposed to an external magnetic field. In response to the need for rapid and bidirectional changes in stiffness, this research proposes a novel approach—pre-magnetized MREs—using permanently magnetized ferromagnetic particles instead of an external permanent magnet for magnetic bias. The pre-magnetized MRE, fabricated with silica-coated neodymium alloy particles and silicone elastomer, undergoes a comprehensive investigation of design parameters, including silicone resin selection, particle thickness, size, and weight ratio. The study explores the directional effects of pre-magnetization through simulations, considering forces among magnetized particles and the hyperelasticity of the elastomer. Experimental investigations involve measuring shear moduli for different shear strains under varying magnetization directions. The results highlight the impact of resin type, particle size, and weight ratio on the magnetorheological (MR) effect. Additionally, an application testbed is developed to assess bi-directional changes in stiffness for various core materials. The study reveals a correlation between MR effect/response time and the magnetic permeabilities of core materials, along with the attraction and repulsion forces between the core and magnetized particles. Observations indicate that the MR effect for different core materials ranges from 0.08% to 0.25%, with response times measured at 40 and 46 ms for forward and reverse currents, respectively. The findings contribute valuable insights into optimizing the design and performance of pre-magnetized MREs for enhanced bi-directional stiffness control in engineering applications.
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来源期刊
Smart Materials and Structures
Smart Materials and Structures 工程技术-材料科学:综合
CiteScore
7.50
自引率
12.20%
发文量
317
审稿时长
3 months
期刊介绍: Smart Materials and Structures (SMS) is a multi-disciplinary engineering journal that explores the creation and utilization of novel forms of transduction. It is a leading journal in the area of smart materials and structures, publishing the most important results from different regions of the world, largely from Asia, Europe and North America. The results may be as disparate as the development of new materials and active composite systems, derived using theoretical predictions to complex structural systems, which generate new capabilities by incorporating enabling new smart material transducers. The theoretical predictions are usually accompanied with experimental verification, characterizing the performance of new structures and devices. These systems are examined from the nanoscale to the macroscopic. SMS has a Board of Associate Editors who are specialists in a multitude of areas, ensuring that reviews are fast, fair and performed by experts in all sub-disciplines of smart materials, systems and structures. A smart material is defined as any material that is capable of being controlled such that its response and properties change under a stimulus. A smart structure or system is capable of reacting to stimuli or the environment in a prescribed manner. SMS is committed to understanding, expanding and dissemination of knowledge in this subject matter.
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