Lau Kai Chi, Shi Lihong, Tam Wing Yim, Sheng Ping
Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
Phys Rev E Stat Nonlin Soft Matter Phys. 2003 May;67(5 Pt 1):052502. doi: 10.1103/PhysRevE.67.052502. Epub 2003 May 14.
We report the enhancement of yield stress in electrorheological (ER) fluids by a shear-annealing method, using creep-recovery (CR) cycles under an external electric field. The enhancement depends on the duration and the strength of the applied shear stress, as well as on the number of the CR cycles. The shear-annealing method enables the particles in the ER fluid to form microstructures with an increased yield stress, manifest as better aligned and denser columns. For a sufficiently large number of CR cycles, with an optimal combination of stress duration and shear strength, a stable state can be obtained whereby shear deformation becomes elastic.
我们报告了一种通过剪切退火方法提高电流变（ER）流体屈服应力的方法，即在外部电场下使用蠕变恢复（CR）循环。这种增强取决于所施加剪切应力的持续时间和强度，以及CR循环的次数。剪切退火方法使ER流体中的颗粒形成具有更高屈服应力的微观结构，表现为排列更整齐、密度更大的柱状结构。对于足够多的CR循环，在应力持续时间和剪切强度的最佳组合下，可以获得一种稳定状态，此时剪切变形变为弹性变形。
