The Breakage Of Shape-Anisotropic Particles Under Normal Contact With Different Particle Shape Parameters

This paper elaborates the cone-hemispherical gypsum particle breakages under normal contact with different particle shape parameters (contact diameter d, cone angle theta and sphere diameter D) and proposes a simple quantitative approach to discriminate breakage modes. The effects of the particle shape parameters on particle breakage are investigated through analyzing breakage processes, breakage modes and force-displacement curves. Three breakage modes are formed during the breakage experiments: peeling, peeling-splitting and splitting, corresponding to three different normal force-displacement curves. The formation of a conical core is deemed as the precondition for particle splitting. The particle breakage mode transfers from peeling to splitting with the increase in contact diameter d and cone angle theta, but a decrease in sphere diameter D. The critical normal force F-cr is positively linearly related to contact diameter d and cone angle theta, but the relationship between F-cr and sphere diameter D heavily depends on the breakage mode. Furthermore, the critical contact diameter d(cr) described by cone angle theta and sphere diameter D is proposed to discriminate breakage modes of the cone-hemispherical gypsum particles.