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Dynamic Behavior Modeling of Natural-Rubber/Polybutadiene-Rubber-Based Hybrid Magnetorheological Elastomer Sandwich
Ahobal N1,2, Lakshmi Pathi Jakkamputi3, Sakthivel Gnanasekaran2
1Department of Mechanical Engineering, Dayananda Sagar College of Engineering, Bengaluru 560078, India.
Polymers
|January 17, 2024
Summary
This study on hybrid magnetorheological elastomer (MRE) beams shows increased natural frequencies with higher PBR content and magnetic fields. Damping also improves significantly, offering potential for advanced engineering applications.
Area of Science:
- Materials Science
- Mechanical Engineering
- Composite Materials
Background:
- Magnetorheological elastomers (MREs) are smart materials whose properties change in response to magnetic fields.
- Hybrid MREs combine different elastomers to optimize performance.
- Understanding the dynamic behavior of MRE structures is crucial for their application in vibration control.
Purpose of the Study:
- To investigate the dynamic characteristics of natural rubber (NR)/polybutadiene rubber (PBR)-based hybrid MRE sandwich composite beams.
- To analyze the influence of magnetic field intensity, boundary conditions, ply orientation, and core thickness on vibration responses.
- To explore the potential for performance enhancement in hybrid MRE sandwich composites.
Main Methods:
- Numerical simulations and finite element analysis were employed.
- Reddy's third-order shear deformation theory was utilized.
- Four distinct hybrid MRE sandwich configurations were examined and validated against MR-fluid-based composites.
Main Results:
- A 10.4% enhancement in natural frequencies was observed in SC4-based beams under a 600 mT magnetic field with clamped-free boundary conditions, due to increased PBR content.
- Higher magnetic field intensities led to slight frequency decrements attributed to filler particle agglomeration.
- The loss factor improved by 66% to 136% with increased magnetic field intensity and MRE content under clamped-free conditions.
Conclusions:
- Hybrid MRE sandwich composites exhibit tunable dynamic properties influenced by magnetic fields and material composition.
- The study demonstrates significant improvements in natural frequencies and damping, highlighting the potential for vibration control applications.
- This research provides valuable insights into the complex relationship between magnetic field effects, composite architecture, and vibration response in MREs.
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