Zhejiang Feiya Elevator Co.

Jinhua, China

Zhejiang Feiya Elevator Co.

Jinhua, China

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Wang H.,Zhejiang Normal University | Bi C.,Zhejiang Feiya Elevator Co. | Zhang Z.,Zhejiang Normal University | Kan J.,Zhejiang Normal University | Gao C.,Zhejiang Normal University
Journal of Intelligent Material Systems and Structures | Year: 2013

Stress-strain relationships of magnetorheological fluids under tension tests have been studied over a wide applied magnetic field being generated by a coil carrying different magnitudes of direct current electrical current range. Five tensile behaviors of magnetorheological fluids have been described and explained by structure strengthening effect and decreasing magnetic field strength. The results showed that magnetorheological fluid corresponded to the changes in tensile stress due to the changes in magnetic field. Normalized tensile stress and normalized magnetic field have been proposed to clearly demonstrate the nature of structure strengthening effect during elongation. Under a constant normalized magnetic field, the change of the normalized tensile stress indicated the change of the structure parameter, which showed the existence of structure strengthening effects during elongation. Corresponding to the tensile behavior change, the exponent of tensile yield stress versus magnetic field was also found to vary in different magnetic field ranges. © 2012 The Author(s).


Wang H.,Zhejiang Normal University | Bi C.,Zhejiang Feiya Elevator Co.
2010 International Conference on Mechanic Automation and Control Engineering, MACE2010 | Year: 2010

Quasi-static squeezing process of MR fluids under different magnitudes of DC electrical current was investigated. A experiment setup was designed and fabricated to test the compression characteristics. It showed that the curves can be devided into three different regions. In the first region, the compressive stress and compressive modulus increase as the small compressive strain increases, lower than 0.025. In the second region, the compressive stress keeps nearly constant, but the compressive modulus decreases to the lower value at a compressive strain of about 0.15. And then the compressive stress and the compressive modulus showed an exponential relationship with the compressive strain while the strain is higher than 0.15. ©2010 IEEE.


Wang H.,Zhejiang Normal University | Wang X.,Zhejiang Normal University | Bi C.,Zhejiang Feiya Elevator Co.
Advanced Materials Research | Year: 2011

The ability of magnetorheological(MR) fluids to resist compression in the direction of magnetic field was tested to investigate the quasi-static squeezing process of MR fluids. A experiment setup was designed and fabricated to test the compression characteristics. Under the different magnetic flux density, the curves of the MR fluids were studied for yield stress versus compression stress, compression stress versus compression strain. The compression resistance of MRF was then measured for the different magnetic flux density for comparison with the shear yield strength of the same magnetic field. The results showed that the compression resistance of the MRF was much stronger than its shear yield stress for the same magnetic field strength conditions. The compression resistance of MRF can be utilized to design new magnetorheological devices. © (2011) Trans Tech Publications.


Wang H.,Zhejiang Normal University | Bi C.,Zhejiang Feiya Elevator Co. | Kan J.,Zhejiang Normal University | Gao C.,Zhejiang Normal University | Xiao W.,Zhejiang Normal University
Journal of Intelligent Material Systems and Structures | Year: 2011

The mechanical properties of a MR fluid in compression, elongation, and shearing have been studied in the magnetic field which is generated by a coil carrying different magnitudes of DC electrical current. Test equipment is designed to perform this operation. The compressing tests showed that the MR fluid is quite stiff at small compressive strains being lower than 0.13. The compressive stress and modulus increase quickly when the compressive strain is higher than 0.2. The tensile yield stress of MR fluids represents the effect of the interaction force between the polarized particles and the direction of the applied magnetic field. The shear yield stress represents the effect of the interaction force with the shear direction (perpendicular to the direction of the magnetic field). The relationship between tensile yield stress and shear yield stress verifies the credibility of the calculation model employing a yield angle shaped between particles. A shear yield angle is found to be between about 13.8° and 16.9°, which agrees with the shear yield angle tested well by other researchers. The tensile yield stress is about four times of shear yield stress. © 2011 The Author(s).

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