Assessment of Mechanical Properties of Cohesive Particulate Solids. Part 1: Particle Contact Constitutive Model
Assessment of Mechanical Properties of Cohesive Particulate Solids. Part 1: Particle Contact Constitutive Model
复制标题
粘性颗粒固体的机械性能评估。
DOI：
10.1080/02726350152772056
复制
发表时间：
2001
影响因子：
2.5
通讯作者：
J. Tomas
中科院分区：
文献类型：
--
作者：
J. Tomas
结合颗粒力学和连续介质力学，解释了粘性颗粒固体固结和流动特性的基本原理。通过“刚性颗粒与软接触”模型，推导出颗粒接触中弹性、弹塑性和粘塑性斥力的综合影响。因此，接触法向力位移F N（h K）和粘附力模型F H（F N），描述的瞬时和时间的固结特性（平均）颗粒接触的行为。该方法已被证明对于粘性很强的二氧化钛纳米粉末（表面直径ds = 200 nm，固体密度？s = 3870 kg/m3）。
The fundamentals of cohesive particulate solids' consolidation and flow properties using a reasonable combination of particle and continuum mechanics are explained. By means of the model "stiff particles with soft contacts," the combined influence of elastic, elastoplastic, and viscoplastic repulsion in particle contacts is derived. As a result, contact normal force displacement F N (h K ) and adhesion force models F H (F N ) are presented that describe the instantaneous and time consolidation behavior at characteristic (averaged) particle contacts. The approach has been shown to be effective for the data evaluation of a very cohesive titania nanopowder (surface diameter d S = 200 nm , solid density ? s = 3870 kg/m 3 ).