论文标题
弹性塑料和粘合剂接触：改进的线性模型及其应用
Elasto-plastic and adhesive contact: an improved linear model and its application
论文作者
论文摘要
为弹性塑料和粘合剂接触而开发了改进的线性模型。提出并验证了新的相关性，以估算模型的关键输入参数，包括接触刚度，产量点，最大拉力力和时间步。新提出的接触模型应用于DEM模拟对撞击和散装粒子流动行为的单个粒子接触行为的分析。结果表明，如果考虑到接触塑性变形，则单个粒子和大块粉末的表现更加内凝。提出了一个内聚力的收益率数来描述和控制凝聚粒子相互接触时产量的程度。有临界粒径，在此必须考虑塑性变形的效果。这为弹性塑料和粘合剂接触模型提供了一个新的框架和标准，并为了解塑性变形对粘性颗粒行为的影响迈出了一步。
An improved linear model is developed for elasto-plastic and adhesive contact. New correlations are proposed and validated to estimate the key input parameters of the model, including contact stiffness, yield point, maximum pull-off force and time step. The newly proposed contact model is applied to the analysis of single particle contact behaviour upon impact and bulk particle flow behaviour by DEM simulations. The results show that both single particle and bulk powder behave more cohesively if contact plastic deformation is taken into consideration. A cohesion yield number is proposed to describe and govern the extent of yielding when cohesive particles are in contact with each other. There is critical particle size, below which the effect of plastic deformation must be considered. This provides a new framework and criteria for elasto-plastic and adhesive contact model, and a step towards understanding the effect of plastic deformation on the behaviour of cohesive particles.
