The high performance and potential of the technology maintain the interest of many researchers in the development and improvement of the smart fluid and devices based on it ( Kumar, et al., 2019 Phu and Choi 2019 Hua, et al., 2021). The yield stress of MR fluid is a well-controlled parameter utilized in various MR fluid applications where the fluid experiences high shear strain rates, e.g., damping and torque control devices ( Carlson and Jolly 2000). These parameters can be controlled rapidly and precisely by adjusting the amount of applied magnetic field ( Wang and Meng 2001). When subjected to a magnetic field, the microsized particles link in chains along the magnetic lines, drastically increasing MR fluid’s viscosity up to a point making it semi-solid, which results in improved yield stress and complex modulus. In a passive state, MR fluid behaves as a non-Newtonian pseudoplastic material with a relatively low viscosity. Magnetorheological (MR) fluid is a smart material formed through dispersing magnetically-responsive microsized particles in a liquid carrier. The resulting critical parameters of the optimized design were used to estimate the effects of hollow spring material and operating conditions on the variable stiffness of the device. Finally, the hollow spring design was optimized through analytical and non-linear finite element buckling analysis to maximize MR fluid stiffness effect. In addition, the testing unveiled an enhanced dynamic performance of the spring due to the cumulative effect of MR fluid activation and specifically aligned uniform magnetic field. Secondly, dynamic testing demonstrated the device’s controllable damping and capability to shift natural frequencies. The analytical model was proved to describe the MR fluid static effect of increased spring stiffness accurately. First, the derived analytical model and the device’s controllable stiffness capability were experimentally validated by performing tensile tests with a fabricated hollow polymer spring filled with MRF-132DG. A MR fluid filled spring is a novel device with variable stiffness and damping and is the subject of the present study.
While most of these devices primarily utilize the fluid’s drastic increase in viscosity, its variable stiffness is rarely utilized.
Magnetorheological (MR) fluid is a smart material utilized for semi-active damping devices thanks to its ability to become viscoelastic solid under a magnetic field and provide variable damping. Department of Aerospace Engineering, Embry-Riddle Aeronautical University, Daytona Beach, FL, United States.Stanislav Sikulskyi*, Aryslan Malik and Daewon Kim
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