Tian Yu, Zhang Minliang, Meng Yonggang, Wen Shizhu
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, People's Republic of China.
J Colloid Interface Sci. 2005 Oct 1;290(1):289-97. doi: 10.1016/j.jcis.2005.04.037.
Transient behaviors of a compressed electrorheological (ER) fluid based on zeolite and silicone oil have been experimentally investigated. The ER fluid is purely compressed between two parallel plates. Compressive speed and voltage amplitude effects on the transient process and randomly applied on/off voltages have been studied. Through normalizing compressive stress of the ER fluid, the characteristic compressive strain and the response time constant corresponding to the rise of compressive stress have been fitted with exponential equations. Results show that the rising time of the transient compressive stress is greatly affected by the compressive speed and the compressive strain position applying voltages, while the amplitude of the applied voltage has little effect on the rising time. The obtained transient compressive strain for the compressive stress to rise to its stable value is much smaller than that working in the transient process of ER fluids under shearing. The decay time and decay strain of compressive stress are much less than for stress rising. The half decay compressive strain is as small as 0.0003 in the experiment. Results show that the response time of compressed ER fluids is quick enough for the usual working conditions of squeezing ER dampers.
对基于沸石和硅油的压缩电流变（ER）流体的瞬态行为进行了实验研究。该电流变流体在两个平行板之间被单纯压缩。研究了压缩速度和电压幅值对瞬态过程的影响以及随机施加的通/断电压。通过对电流变流体的压缩应力进行归一化，对应压缩应力上升的特征压缩应变和响应时间常数用指数方程进行了拟合。结果表明，瞬态压缩应力的上升时间受压缩速度和施加电压的压缩应变位置影响很大，而施加电压的幅值对上升时间影响很小。压缩应力上升到其稳定值时获得的瞬态压缩应变远小于电流变流体在剪切瞬态过程中的工作应变。压缩应力的衰减时间和衰减应变远小于应力上升时的情况。实验中半衰减压缩应变小至0.0003。结果表明，对于挤压式电流变阻尼器的通常工作条件，压缩电流变流体的响应时间足够快。
