弹塑性和粘着接触：一种改进的线性模型及其应用
Elasto-plastic and adhesive contact: an improved linear model and its application
摘要：
提出了一种改进的弹塑性和粘着接触的线性模型。提出并验证了新的相关性，以估计模型的关键输入参数，包括接触刚度，屈服点，最大拉脱力和时间步长。新提出的接触模型适用于分析单颗粒接触行为的影响和散装颗粒流动行为的DEM模拟。结果表明，考虑接触塑性形变时，无论是单个颗粒还是块体粉末，均表现出更强的粘结性。提出了一个内聚屈服数来描述和控制内聚颗粒相互接触时的屈服程度。存在临界颗粒尺寸，低于该尺寸时必须考虑塑性形变的影响。这为弹塑性和粘着接触模型提供了一个新的框架和准则，也为理解塑性形变对粘性颗粒行为的影响迈出了一步。
英文摘要：
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.
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