电流变体单链的轴向应变对导电性质的影响

Effect of axial strain of ER fluid single chain on its conducting property

研究了由平均直径约为２１０μｍ的玻璃球在硅油中加直流电场后形成的单链的导电行为，主要研究了链的轴向应变对其导电性质的影响．发现流过静态（无应变）单链的电流随外加电场强度的增加而增加，而与组成链的玻璃球数无关．在恒定的电场下，流过受拉链的电流随轴向应变的增加而减小；小应变时流过链的电流主要是传导电流，大应变时主要是电荷交换．小应变时实测单链的平均电流密度随电场强度的变化与理论预报吻合良好．

The conducting behavior of a single chain formed in silicone oil is studied under dc electrical field. The chain consists of glass spheres with average diameter about 210 μm. It is found that the current flowing through a static (no strain) single chain increases with the electrical field strength and is almost independent of the number of the glass spheres forming the chain. The current flowing through a strained chain decreases with the axial strain under a constant electrical field. The current consists of two parts: one produced by conduction and another produced by the electric charge exchange resulting from the jumping of some sphere(s) in the chain. The current is mainly contributed by conduction at small strain and by the electric charge exchange at large strain. At small strain the measured average current density of a single chain versus the field strength is in good agreement with that predicted theoretically.