Shear jamming onset in dense granular suspensions

Discontinuous shear thickening and dynamic shear jamming can be observed in the dense granular suspension. Here, we determine the criterion for the occurrence of shear jamming by studying the first normal stress difference N-1 of dense granular suspension in steady-state rheology. When N-1 = 0, the suspension is shear jammed, and the frictional contact dominates the framework. The jamming onset stress decreases when the particle volume fraction increases. The lubrication to friction mechanism predicts the occurrence of shear jamming and is consistent with the trend predicted by the Wyart-Cates model. The state of a dense granular suspension can be distinguished in the state diagram via the analysis of N-1. This work can aid understanding of the rheology of concentrated particle suspensions. (c) 2021 The Society of Rheology.

Automated summary

In this study, the criterion for the occurrence of shear jamming in dense granular suspension is determined by studying the first normal stress difference N-1. It is found that shear jamming is dominated by frictional contact, and the jamming onset stress decreases with increasing particle volume fraction. The state of dense granular suspension can be distinguished in the state diagram via the analysis of N-1, aiding understanding of the rheology of concentrated particle suspensions.