A hybrid magnetorheological material for enhanced controllable dynamic range in vibration control applications

Magnetorheological (MR) materials are smart materials that exhibit controllable changes in their rheological properties upon application of a magnetic field. While MR fluids (MRFs) offer high dynamic range, they suffer from limitations such as sedimentation and leakage. Conversely, MR elastomers (MREs) provide better stability but exhibit a limited controllable range, especially under compressive loads. This research proposes a novel hybrid MR material that combines the advantages of both MRFs and MREs. The hybrid material comprises an MR fluid encapsulated within an MR elastomer matrix. This configuration aims to leverage the high dynamic range of MRFs while utilizing the elastomer matrix to overcome the limitations of conventional MRFs. A finite element model was developed to simulate the behavior of the hybrid material under various loading conditions and magnetic fields. Experimental validation was conducted using a rheometer to characterize the dynamic properties of the fabricated hybrid material. Results demonstrate that the proposed hybrid material exhibits a significantly enhanced controllable range compared to conventional MREs, particularly under compressive loading scenarios. This study suggests that the developed hybrid MR material has the potential to advance the development of high-performance vibration control devices and other applications requiring a wide range of controllable stiffness and damping properties.