자기장 영향에 따른 자기유변탄성체의 구름 마찰 특성 연구
A Study on Rolling Friction Characteristics of Magneto-Rheological Elastomer under Magnetic Fields
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초록
Magneto-rheological elastomer (MR elastomer) is a smart material, because it has mechanical propertiesthat change under a magnetic field. An MR elastomer changes its stiffness characteristics when the innerparticles (iron particles) align along the direction of a magnetic field. There has been much research to make useof this characteristic to control vibration issues in various mechanical systems, such as for mounting systems inthe automotive field, home appliances, etc. Furthermore, the friction and wear properties of MR elastomer havebeen studied, as these relate to the durability of the material needed to meet engineering requirements. Rollingfriction (or rolling resistance) is one of these friction properties, but has not yet been studied in the context ofMR elastomers. In this study, an MR elastomer is fabricated in the shape of a hollow cylinder to evaluate therolling friction characteristic under a magnetic field. The test apparatus is setup and a strain gauge is used to calculatethe rolling resistance under test conditions. Permanent magnets are used to supply the magnetic field duringtests. The load and rolling speed conditions are also considered for the tests. The test results show that rollingfriction characteristic has a different trend under different magnetic field, load, and rolling speed conditions. Itis assumed that the stiffness change of an MR elastomer under a magnetic field has an effect on the rolling frictioncharacteristic of the MR elastomer. For the future work, the rolling friction characteristics of MR elastomerswill be controlled by adjusting the strength of the magnetic field using electromagnets.
Abstract
Magneto-rheological elastomer (MR elastomer) is a smart material, because it has mechanical propertiesthat change under a magnetic field. An MR elastomer changes its stiffness characteristics when the innerparticles (iron particles) align along the direction of a magnetic field. There has been much research to make useof this characteristic to control vibration issues in various mechanical systems, such as for mounting systems inthe automotive field, home appliances, etc. Furthermore, the friction and wear properties of MR elastomer havebeen studied, as these relate to the durability of the material needed to meet engineering requirements. Rollingfriction (or rolling resistance) is one of these friction properties, but has not yet been studied in the context ofMR elastomers. In this study, an MR elastomer is fabricated in the shape of a hollow cylinder to evaluate therolling friction characteristic under a magnetic field. The test apparatus is setup and a strain gauge is used to calculatethe rolling resistance under test conditions. Permanent magnets are used to supply the magnetic field duringtests. The load and rolling speed conditions are also considered for the tests. The test results show that rollingfriction characteristic has a different trend under different magnetic field, load, and rolling speed conditions. Itis assumed that the stiffness change of an MR elastomer under a magnetic field has an effect on the rolling frictioncharacteristic of the MR elastomer. For the future work, the rolling friction characteristics of MR elastomerswill be controlled by adjusting the strength of the magnetic field using electromagnets.
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