A microstructural investigation of the nonlinear response of electrorheological suspensions. I: Start-up of steady shear flow

摘要: Particle-level simulations are employed to investigate the transition from linear nonlinear rheological behavior for electrorheological suspensions under start-up of steady shear flow. This is found first arise very slight rearrangement structures, as opposed gross rupture particulate columns. Linear stability analysis shows that these rearrangements occur when structures sheared into electrostatically unstable configurations. The also produce a second type relaxation phenomenon appears at low frequencies and finite strain amplitudes. Incorporating more realistic force descriptions idealized simulation model shifts deformation smaller amplitudes, approaching experimentally observed values. role on oscillatory flow response investigated in following paper, Part II.