Effect of nonlinear periodic shear deformation on the resistance to stationary flow and low-amplitude oscillations

Abstract

1. The characteristics of the variable component of response to nonlinear periodic deformation change only slightly if stationary shear with a low rate is added to the deformation law. 2. The apparent viscosity at a constant shear rate and strain amplitude decreases only slightly with increasing frequency in the range of low frequencies, rapidly decreases in the range of medium frequencies, and again slightly decreases in the range of high frequencies. The boundary frequencies of these regions depend on the stationary shear rate, strain amplitude, and the critical strain amplitude corresponding to the transition from linear to nonlinear deformation. 2. The conditions of superimposition of the oscillations of the low amplitudes on the nonlinear stationary flows and superimposition of nonlinear periodic deformation with stationary flow with a low shear rate are the extreme cases of the superimposition of the low and finite strain amplitudes where one of the frequencies is equal to or tends to zero.