Mechanical property of magnetorheological fluid in squeeze mode

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.