Theoretical and experimental research on the mechanical properties of magnetorheological elastomers based on PDMS

Frontiers in Materials

Materials

Li Li¹  Xuewei Huang¹  Xiaohui Ruan² 

[1] School of Mechanics and Safety Engineering, ZhengZhou University, ZhengZhou, China;School of Mechanics and Safety Engineering, ZhengZhou University, ZhengZhou, China;CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, China;Institute of Advanced Technology, University of Science and Technology of China, Hefei, China;

关键词: magnetorheological elastomers;    stress-strain curve;    magnetic dipoleviscoelastic model;    equivalent stiffness;    equivalent damping;   

DOI  :  10.3389/fmats.2023.1253055

 received in 2023-07-04, accepted in 2023-07-19,  发布年份 2023

来源: Frontiers

【 摘 要 】

Magnetorheological Elastomers (MREs) are smart materials with the ability to modulate their mechanical properties by changing the external magnetic fields, offering extensive potential for applications requiring variable stiffness and damping devices. A comprehensive mechanical model that explains the influence of loading conditions on the performance of MRE is crucial for understanding their intrinsic mechanisms during operation, and for the design, analysis, and improvement of intelligent energy dissipation and vibration control devices based on MRE. In this study, a four-parameter mechanical model was established to reveal the intrinsic mechanisms about the effects of external magnetic fields, loading frequency, and strain amplitude on the storage modulus, loss modulus, equivalent stiffness, and equivalent damping of MRE materials. The dynamic mechanical properties of the MRE materials prepared from carbonyl iron powder and PDMS were tested, and parameter identification of the established model was performed. The comparison results between the theoretical model analysis and the testing results demonstrated that the proposed mechanical model effectively characterizes and predicts the mechanical behavior of MRE materials. Furthermore, based on the prepared MRE materials, a stiffness-controllable energy dissipator operating in shear mode was designed and fabricated, and the mechanical performance of the shear energy dissipator was experimentally evaluated. This research provides a basis and guidance for the design and mechanical performance analysis of devices based on MRE, confirming the feasibility of MRE materials as core components in intelligent energy dissipation devices.

【 授权许可】

Unknown   
Copyright © 2023 Huang, Li and Ruan.