Abstract
Chain formation model is very useful to characterize the magneto-rheological phenomenon and prepare good magneto-rheological fluids. The single-chain model is common to explain the process of chain formation for ferromagnetic particles under magnetic field. With the increment of magnetic field and ferromagnetic particle content, the chain will transit from the single chain to multi-chains. However, there are few literatures involved in this phenomenon. This study investigates the effect of magnetic field and ferromagnetic particles content on the transition. The static yield stresses at different magnetic fields were measured under quasi-static mode for different magneto-rheological fluid samples. The results show that the transition of chain model can be identified on two parameters including the amplitude of static yield angle, [Formula: see text], and the inclined angles distribution, [Formula: see text]. The single-chain model is only effective under low magnetic field and ferromagnetic particles below content of 30% volume. With the increment of magnetic field and ferromagnetic particles content, the transition from single chain to multiple chains will be observed, which validates that there is a transition from the single chain to multi-chains.
Highlights
Magneto-rheological fluid (MRF) is a kind of smart material.[1,2] MRF possesses the salient characteristics such as rapid response, reversible, and low power requirement, which has some primary engineering applications.[3,4,5] To depict the mechanical rheological property of MRF, there are two categories of models: continuous models[6,7] and discrete models[8,9] in general
The chain mechanism of ferromagnetic particles based on the magnetic dipole theory is a relatively effective method to depict the micro-macro mechanism of magnetorheological (MR) material
The chain mechanism of ferromagnetic particles based on the magnetic dipole theory can depict the performance of MR material very well
Summary
Magneto-rheological fluid (MRF) is a kind of smart material.[1,2] MRF possesses the salient characteristics such as rapid response, reversible, and low power requirement, which has some primary engineering applications.[3,4,5] To depict the mechanical rheological property of MRF, there are two categories of models: continuous models[6,7] and discrete models[8,9] in general Comparing with the former ones, the latter models are based on the basic physical law, and it is more general.[10] Within the discrete models, the chain mechanism of ferromagnetic particles based on the magnetic dipole theory is a relatively effective method to depict the micro-macro mechanism of magnetorheological (MR) material. The purpose of this study is to figure out the transition mechanism of micro-dynamics of ferromagnetic particles under magnetic field and its impact factors through the experimental method for MRF. Experiments and the corresponding results and discussions are performed in section ‘‘Experiments.’’ The conclusion is made in section ‘‘Conclusion.’’
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