Meso-scale study on damage performance of resin mineral composite material for machine tool bed based on PFC^3D

This subject mainly studies the damage evolution process and failure mode of the resin-mineral composite material used for the machine bed under typical working conditions. In this study, a four media discrete element model was established based on particle flow numerical simulation technology (Three-dimensional particle flow code, PFC^3D), as well as grading and random aggregate shape. The model includes aggregate, interfacial transition zone, resin matrix and porous resin mineral composites. The failure evolution and crack distribution of resin mineral composites were studied under the typical working conditions of machine tool and the formation mechanism of crack initiation, propagation and penetration was studied from a meso-level perspective. The results show that: (1) Damage evolution of resin mineral composites can be divided into four stages. (2) Cracks appeared earlier in the interface between aggregate and resin matrix. In addition, the crushing phenomenon occurs at the weak position with parallel loading and no large aggregate support. This study provides an important reference for the study of damage properties of resin mineral composites as basic parts of machine tools.