基于几何形态学影响的集料建模及评价方法

集料几何学特性是影响颗粒复合材料力学性能的重要因素，也是实现复合材料性能精确设计的理论基础。以颗粒增强树脂基复合材料(particle-reinforced resin matrix composite, PRMC)为研究对象，采用PFC和3D MAX联合创建了精细的数字集料，分析集料综合几何学特性对PRMC动态损伤特性的影响，进一步细化并分离出集料单一几何学特征，通过分级替换不同粒径的圆形集料研究集料单一几何学特性对PRMC力学特性的影响。研究结果表明：集料几何学特性影响原始微损伤的分布，引导裂纹的扩展并最终决定PRMC的压缩破坏模式，并且压缩破坏过程存在典型的随机损伤特性；集料的形状、棱角和纹理通过降低集料间的流动性提高PRMC的抗压强度，而集料骨架系统需要在分形维数、级配级数、最大粒径和最大最小粒径比之间寻求最佳参数组合来提高PRMC的抗压强度。

Effective resin content and its effect on the overall performance of polymer concrete for precision machine tools

Aggregate geometry is vital for the mechanical properties of granular composites and is also the theoretical basis for the precise design of composites. Therefore, taking particle-reinforced resin matrix composite (PRMC) as an object, the influence of aggregate geometry on the compressive strength and damage process of PRMC is studied. A refined digital aggregate of PRMC is established by employing PFC and 3D MAX, and the effect of aggregate comprehensive geometry properties on characteristic of PRMC dynamic damage is analyzed. Then, the effect of single geometrical characteristics on the mechanical properties of PRMC by substituting circular aggregates of different particle dimensions through refining and separating the single geometrical characteristics from comprehensive geometry properties. The results show that: the geometrical properties of aggregates affect the distribution of the original micro-damage, leading to the crack propagation and determine the compression failure mode of PRMC. In addition, the results also show that the compression failure process of PRMC has typical random damage characteristics. The aggregate shape, such as edges, corners and, texture improve the compressive strength of PRMC by reducing the fluidity between aggregates, while the aggregate skeleton system needs to find the best parameter combination among fractal dimension, graded series, maximum particle size and, the ratio of maximum to minimum particle size.