Analyzing the influence of the core pre-structure on the dynamic response of a magnetorheological elastomer sandwich structure

Abstract

Recently, vibration control has been useful in various engineering fields such as aerospace, adaptive dynamic vibration absorbers, and infrastructure. Magnetorheological elastomer (MRE) is an interesting material for controlling and suppressing undesirable vibrations through the application of a magnetic field. The present study aims at analyzing the pre-structure of the magnetorheological viscoelastic core in the dynamic response of an MRE-sandwich structure. The forced vibration tests were performed under a non-homogenous magnetic field to evaluate the dynamic properties of the MRE-sandwich structure in a frequency bandwidth range of 0-250 Hz. Experimental results show that the proposed MRE-sandwich structures are capable of eliminating unwanted resonances due to induced magnetic field intensity in the activated region, especially at the fundamental mode. Moreover, results highlight that an oriented pre-structure in an MRE-sandwich has an attenuation effect on vibrations in the low frequency range. Additionally, the external magnetic field increased the structural vibrations damping capability by approximately 200%. Oriented pre-structures of the MRE core were also used to dissipate vibration. Consequently, they could potentially be used in vibration attenuation applications such as stop operations in dynamic structures.

One-step formation of three-dimensional interconnected T-shaped microstructures inside composites by orthogonal bidirectional self-assembly method

“…Our previous studies [ 23 , 24 ] and those of others [ 25 , 26 ] have employed a simple self-assembly approach to successfully construct one-dimensional (1D) interconnected microstructures of fillers within polymer matrix. The application of an external force to drive the motion and orientation of the internal fillers in a polymer precursor allows for control of the internal fillers to self-assemble into percolation pathways, which results in highly enhanced electrical and thermal conductivity performance, even with only small amounts of filler.…”