A study on the effects of microparameters on macroproperties for specimens created by bonded particles

摘要

Purpose - To use distinct element simulation (PFC2D) to investigate the relationships between microparameters and macroproperties of the specimens that are modeled by bonded particles. To determine quantitative relationships between particle level parameters and mechanical properties of the specimens. Design/methodology/approach - A combined theoretical and numerical approach is used to achieve the objectives. First, theoretical formulations are proposed for the relationships between microparameters and macroproperties. Then numerical simulations are conducted to quantify the relationships. Findings - The Young's modulus is mainly determined by particle contact modulus and affected by particle stiffness ratio and slightly affected by particle size. The Poisson's ratio is mainly determined by particle stiffness ratio and slightly affected by particle size. The compressive strength can be scaled by either the bond shear strength or the bond normal strength depending on the ratio of the two quantities. Research limitations/implications - The quantitative relationships between microparameters and macroproperties for parallel-bonded PFC2D specimens are empirical in nature. Some modifications may be needed to model a specific material. The effects of the particle distribution and bond strength distribution of a PFC2D specimen are very important aspects that deserve further investigation. Practical implications - The results will provide guidance for people who use distinct element method, especially the PFC2D, to model brittle materials such as rocks and ceramics. Originality/value - This paper offers some new quantitative relationships between microparameters and macroproperties of a synthetic specimen created using bonded particle model.