Herein we numerically study the rheology of a two-dimensional frictional granular system confined by constant pressure under oscillatory shear. Several scaling laws for the storage and loss moduli against the scaled strain amplitude have been found. The scaling laws in plastic regime for large strain amplitude can be understood by the angular distributions of the contact force. The scaling exponents are estimated by considering the physical mechanism.

• Received 20 February 2019
• Revised 17 March 2020
• Accepted 19 March 2020

DOI:https://doi.org/10.1103/PhysRevE.101.042902