标题： 压应力和拉应力在部分粘结颗粒材料中的微观力学 显示英文标题

标题： Micromechanics of compressive and tensile forces in partially-bonded granular materials

摘要： 在颗粒介质中，即使少量的颗粒间粘附也会表现为整体强度和刚度的增加，这些效应通常与每个颗粒的平均约束数增加有关。 通过进行一组各向同性压缩实验，所有实验都从相同的初始颗粒配置开始，但具有不同比例的粘结颗粒，我们使用偏光力测量来在颗粒尺度和介观尺度上确定这一现象的原因。 作为粘结颗粒百分比的函数，我们测得发生堵塞时的临界填充分数略有下降。 在堵塞之上，相对于未粘结的情况，粘结颗粒的局部压力主要通过拉力和压力的相等贡献而增加。 颗粒间力的大小直方图对于具有更多粘结颗粒的系统变得更加宽泛。 我们测量了距离粘结二聚体的距离函数的压力和配位数，两者对于最近邻颗粒都是局部增强的，这表明二聚体似乎作为集中力和连接区域，提高了刚度。 显示英文摘要

摘要： In granular media, the presence of even small amounts of interparticle cohesion manifests as an increase in the bulk strength and stiffness, effects that are typically associated with an increase in the average number of constraints per particle. By performing an ensemble of isotropic compression experiments, all starting from the same initial particle configuration but with varying fraction of bonded particles, we use photoelastic force measurements to identify the causes of this phenomenon at the particle-scale and meso-scale. As a function of the percentage of bonded particles, we measure a small decrease in the critical packing fraction at which jamming occurs. Above jamming, the local pressure increases predominantly for the bonded particles, measured relative to the unbonded case, through approximately equal contributions of both tensile and compressive forces. Histograms of the magnitude of the interparticle forces become broader for systems with more bonded particles. We measure both pressure and coordination number as a function of distance from a bonded dimer, both of which are locally enhanced for nearest neighbors, indicating that dimers appear to act as areas of concentrated force and connectivity that improve rigidity.