Horak, Wojciech
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Item type:Article, Access status: Open Access , Experiments and analysis of the limit stresses of a magnetorheological fluid(2022) Horak, Wojciech; Stępień, Barbara Iwona; Sapiński, Bogdan
Wydział Inżynierii Mechanicznej i RobotykiThis paper presents the results of a rheological test of a commercial magnetorheological (MR) fluid (MRF-132DG). The research includes the problem of measuring and interpreting limit stresses under conditions close to the magnetic saturation of the fluid. Four different limit stresses were determined, two related to the yield point and two related to the flow point. Methods for determining limit stresses, especially due to excitation conditions, were also analysed. The aim of this study is to determine the effect of selected parameters on the values of limit stresses of the selected MR fluid. An additional objective is to highlight the problems of defining and interpreting individual limit stresses in MR fluids, particularly in the context of selecting the values of these stresses for the purpose of modeling systems with MR fluids.Item type:Doctoral Dissertation, Access status: Open Access , Teoretyczna oraz doświadczalna analiza procesu wyciskania cieczy magnetoreologicznej(Data obrony: 2013) Horak, Wojciech
Wydział Inżynierii Mechanicznej i RobotykiThe paper presents a detailed description of the issues related to the subject of magnetorheological fluid (MR). A description of the physical properties of the liquid MR, rheological properties, and discusses methods for modelling the behaviour of these substances. An analysis of changes in MR fluid microstructure resulting from external factors. Discusses the characteristics of the behaviour of the MR fluid in the various operating modes. The main part of the work involves theoretical analysis of the MR fluid squeeze process. On the basis of the principles of continuum mechanics and the theory of a magnetic field, model describing the state of stress and the behaviour the MR fluid subjected to compression was derived. The model was verified based on the results of experiments. Experimental part of the work includes two aspects, the study of rheological properties of selected MR fluids and study of the behaviour of the MR fluid in squeeze flow mode. Performed studies allowed to describe the rheological properties of examining fluids by the Bingham model and also verify the phenomenon of generating normal stresses by MR fluids. The results of the MR fluid squeeze measurements at different magnetic field induction value and various squeeze speeds allowed to perform analyses of the impact of selected factors on the behaviour of the fluids subjected to squeeze. The result carried out analyses is developing the new model describing behaviour of the MR fluids in squeeze flow mode and to determine the influence of selected parameters to the squeeze process.