Dynamic Characterization of Magnetorheological Sandwich Structures
Summary
Magnetorheological sandwich structures comprise two stiff face sheets encapsulating a core layer of magnetorheological fluid or elastomer. Under external magnetic fields, the core’s rheological properties change rapidly, endowing the assembly with tunable stiffness and damping. Dynamic characterisation of these structures explores natural frequencies, mode shapes and energy dissipation under various loading, boundary and magnetic conditions. Experimental methods often combine modal analysis, sweep excitation and impact testing, while theoretical models draw on Hamilton’s principle, viscoelastic constitutive laws and finite element formulations. Key parameters influencing dynamic performance include particle concentration, fluid composition, pre-structuring of the core, skin-core thickness ratio and field intensity. Advances in this field promise adaptive vibration suppression in aerospace panels, precision machinery, infrastructure damping systems and next-generation soft robotics.
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Dynamic Characterization of Magnetorheological Sandwich Structures publication trend
The graph below shows the total number of articles in dynamic characterization of magnetorheological sandwich structures across all publications each year (not limited to Nature Index journals).
Technical terms
Magnetorheological fluid: A suspension of micron-scale magnetic particles in a carrier liquid whose viscosity and yield stress change in response to a magnetic field.
Magnetorheological elastomer: A polymer matrix embedded with magnetic particles, combining elastic recovery with field-dependent stiffness and damping.
Sandwich structure: A composite assembly featuring two strong face sheets bonded to a lightweight, often adaptive, core material to achieve high bending stiffness.
Viscoelasticity: The property of materials that exhibit both viscous flow and elastic recovery under deformation, described by time-dependent stress–strain relations.
Damping ratio: A dimensionless measure of energy dissipation in a vibrating system, expressed as the fraction of critical damping.
References
- 3D-Printed Soft Structure of Polyurethane and Magnetorheological Fluid: A Proof-of-Concept Investigation of its Stiffness Tunability. Micromachines (2019).
- Dynamic behavior of sandwich beams with different compositions of magnetorheological fluid core. International Journal of Smart and Nano Materials (2021).
- Analyzing the influence of the core pre-structure on the dynamic response of a magnetorheological elastomer sandwich structure. Smart Materials and Structures (2022).
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