Study on mechanical properties of two-dimensional roller cutter penetrating different particle systems

Abstract In order to study the mechanical properties of the disc cutter penetrating the particle system, a composite particle system model of the monodisperse particle system and soft and hard interlayered composite particle system was established based on the discrete element method, in which the monodisperse particle system was divided into hard particle system and soft particle system, combined with the complex network theory, and the crack propagation phenomenon and force chain were analyzed from the perspective of mesomechanics, and the distribution and evolution of the second invariant of stress and stress deviation were revealed. The results show that the composite particle system is prone to form long cracks. The force chain under the hob cutter is asymmetrically distributed, and the force chain transmission is generated inside the particle system. With the increase of depth, the average stress F in the monodisperse particle system conforms to the polynomial distribution, and the average stress F in the composite particle system increases first and then decreases with the increase of penetration depth. The clustering coefficient and the shortest path of the force-chain network of the composite particle system are sensitive to the penetration process. At the same distance and depth, the J2max of the hard layer particle system is significantly larger than that of the composite particle system.