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.
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