  The rheology of cohesive granular materials, under a constant pressure
condition, is studied using molecular dynamics simulations. Depending on the
shear rate, pressure, and interparticle cohesiveness, the system exhibits four
distinctive phases: uniform shear, oscillation, shear-banding, and clustering.
The friction coefficient is found to increase with the inertial number,
irrespective of the cohesiveness. The friction coefficient becomes larger for
strong cohesion. This trend is explained by the anisotropies of the
coordination number and angular distribution of the interparticle forces. In
particular, we demonstrate that the second-nearest neighbors play a role in the
rheology of cohesive systems.
