{"title":"开发用于双向可变刚度应用的预磁化磁流变弹性体","authors":"Choonghan Lee, Woosoon Yim","doi":"10.1088/1361-665x/ad7003","DOIUrl":null,"url":null,"abstract":"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.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":null,"pages":null},"PeriodicalIF":3.7000,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Development of pre-magnetized magnetorheological elastomer for bidirectionally variable stiffness applications\",\"authors\":\"Choonghan Lee, Woosoon Yim\",\"doi\":\"10.1088/1361-665x/ad7003\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"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.\",\"PeriodicalId\":21656,\"journal\":{\"name\":\"Smart Materials and Structures\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.7000,\"publicationDate\":\"2024-08-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Smart Materials and Structures\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1088/1361-665x/ad7003\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"INSTRUMENTS & INSTRUMENTATION\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Smart Materials and Structures","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1088/1361-665x/ad7003","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"INSTRUMENTS & INSTRUMENTATION","Score":null,"Total":0}
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.
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.