This paper presents a rheological model that was developed to stimulate the experimental behavior of magnetorheological elastomers (MREs) under varying loading conditions (magnetic field, strain amplitude and frequency). Magnetorheological elastomers (MREs) were fabricated and tested using double lap shear experiment setup under different strain amplitudes, magnetic fields and frequencies. A linear visco-elastic rheological model consists of seven parameters to represent both viscous and elastic behavior of MREs. The parameters under varying loading conditions were identified and optimized using the data recorded from experiments. The experimental results were then compared with model predicted values which demonstrate that the seven-parameter model predicts MRE behavior well.
This study presents the design, development, testing, and performance evaluation of a scaled bridge bearing utilizing
magnetorheological elastomer (MRE) layers as adaptive elements, which allow for a varying stiffness under a magnetic
field. The adaptive bridge bearing system incorporates a closed-loop magnetic circuit that results in an enhanced magnetic
field in the MRE layers. A new design is introduced and optimized using structural and magnetic finite element analyses.
Two bearings and a test setup for applying simultaneous variable shear, constant compression, and a variable magnetic
field on the bearing are fabricated. The adaptive bridge bearing results demonstrate the stiffness change of the bearing
under different strain levels and loading frequencies, as well as the ability of the bearing to change its stiffness under
different applied electric currents, which can be correlated to the applied magnetic field.
This study presents an adaptive bridge bearing that can sense structural loads and tune its properties to mitigate structural
vibrations. The bearing utilizes magnetorheological elastomer (MRE) layers which allow for an increased stiffness
induced with a magnetic field. The system also features a MRE-based sensing system for sensing the structural wind and
traffic load. The sensing system is capable of transmitting data wirelessly to a central logging computer for monitoring
bridge performance and sending alerts in the case of a major event. The capability of the MRE-based sensing system for
sensing structural loads and wireless transmission of data were investigated. The adaptive bridge bearing incorporates a
closed-loop magnetic circuit that results in an enhanced magnetic field in the MRE layers. Results show the sensitivity
of the MRE-based sensors and the performance of the wireless system, as well as the design and analysis of the tunable