DYNAM IC Y IELD STRESSOF ELECTRORHEOLOGICAL FLUID

Combining the micro structure and the interaction between two particles in an electrorheological fluid thaTis calculated by the modified dipolemodel and the conductivity model respecTively, the shear stress-strain relationships of the electrorheological fluid were set up. On this basis, and considering the fracture and reconfiguration process in the post-yield state of this material, its dynamic yield stress was obtained. The calculation indicates that the dynamic yieldst ress low er than staTic yield st ress by abou t 25%. In addiTion, the dynam ic yield st ress of theelect ro rheo logical f lu id increases nearly linearly w ith the vo lume f racTion at the small vo lumef racTion and get s their max imum s at rather large vo lume f racTion s, 0. 4～ 0. 5.