Viscoelastic properties of MR shear thickening fluids

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概要

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• Magento-rheological Fluid (MRF) and Shear Thickening Fluid (STF) have separately attracted considerable interest due to their fast and reversible response to an external magnetic field or an abrupt shearing loading. In this paper we fabricated a combined phase of Magento-rheological Shear Thickening Fluid (MRSTF) such that it has an MR and a shear thickening effect. To fabricate it, 14 nm primary size fumed silica particles were suspended in ethylene glycol to form a 25% by weight fraction of STF base. Carbonyl iron particles (3-5 μm) were then mixed with the STF base to obtain four MRSTF samples with weight fractions of 5%, 10%, 20%, and 30%. The viscoelastic properties of all four samples, namely their steady state and dynamic behaviour, were investigated with a parallel-plate rheometer. The relevance of the dynamic behaviour to the stress amplitude, frequency, and external magnetic field were investigated and discussed. MRSTFs behave like linear viscoelastic materials for a small range of stress amplitudes, but at large stress amplitudes they are non-linear viscoelastic or viscoplastic, where the storage modulus gradually decreases with the stress amplitude. Within the linear viscoelastic range of shear stress, MRSTFs behave with linear viscoelastic properties as the frequency increases. MRSTFs also exhibit features of both components, but are more prone to MRF with the inception of external field excitations.

• 一般社団法人 日本機械学会の論文

著者

• Li Weihua

  School Of Mechanical Materials And Mechatronic Engineering Faculty Of Engineering University Of Wollongong

• NAKANO Masami

  Intelligent Fluid Control Systems Laboratory, Institute of Fluid Science, Tohoku University

• TOTSUKA Atsushi

  Intelligent Fluid Control Systems Laboratory, Institute of Fluid Science, Tohoku University

• TIAN Tongfei

  School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong

• SATO Chuichiro

  Intelligent Fluid Control Systems Laboratory, Institute of Fluid Science, Tohoku University

関連論文

• Magnetorheological Properties of Aqueous Ferrofluids
• Viscoelastic properties of MR shear thickening fluids

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