A numerical study of the disc cutter behaviour while cutting hard rocks
The present study investigates the structural behavior of the disc cutter as well as the local behavior, namely stress-strain evolution within the rolling disc cutter while cutting a hard rock block, which is directly related to the disc cutter degradation. The investigation has been carried out using a 3D numerical model in the commercial Finite Element code LS-DYNA. The influence of various material properties (i.e., anisotropic hardening, visco-plasticity) on the disc cutter behavior has been discussed. It has shown that the material properties have significant effect on the local behaviour of the disc cutter in terms of plastic strain distribution. Investigation on the fatigue life of the disc cutter life based on the multi-axial stress history within the disc cutter was also carried out. The analyses depicted that there may be a competition between the wear and fatigue crack initiation in the cutter ring material close to the interface contact with rock.