Analysis, modeling and simulation of quasistatic compressive stressing behavior of bonded model pellets

本项目的主要目标是对不同结构、尺寸和形状的模型球团的压缩和断裂行为进行实验研究、建模和模拟。造粒在许多行业中被用于改善流动性能、用量和降低各种物料的堆积密度。这就产生了对颗粒及其性质进行彻底研究的需要。尽管在该领域进行了许多调查，但仍有许多工程问题尚未解决：-粘结剂(类型、浓度和体积)在球团形成过程中的影响无法解释，-缺乏描述球团在机械应力下的变形的模型，-在压缩和冲击过程中球团的材料、尺寸和形状的未知影响。为了找到适合这些问题的解决方案，有必要进行实验研究并开发数值工具来模拟规则和随机颗粒结构的物理状态和力学行为。本项目的目标是更好地了解球团矿中的微观-宏观相互作用，研究球团矿过程中的作用过程变量及其对球团矿性能的影响，并用离散元方法(DEM)模拟这种影响。模型球团因粘结剂浓度、转速、停留时间等工艺参数的变化而产生的变化，需要进行深入的分析。利用DEM对过程变量与颗粒特性之间的关系进行建模和模拟。

The main object of this project is to experimentally investigate, model, and simulate the compression and fracture behaviour of model-pellets with different structures, sizes and shapes. The pelletizing is used in many industries to improve the flow behaviour, the dosage and to reduce the bulk density of various materials. This creates the need to investigate the pellets and their properties thoroughly. Despite the many investigations in the area, there are still many unsolved engineering problems: - unexplained influence of the binder (type, concentration and volume) in the formation process of the pellet properties, - lack of models to describe the deformation of the pellets at mechanical stressing, - unknown influence of the material, size and shape of the pellets at processes of compression and impact. In order to find a suitable solution to these problems, it is necessary to proceed with the experi-mental studies and to develop numerical tools to model the physical state and the mechanical behaviour of regular and random pellet structures. The goal of this project is to acquire a better understanding of the micro-macro interactions in the pellets, to investigate the acting process variables in a pelletizing process and their influence on the pellet properties and to model this influences by Discrete Element Method (DEM) to model. The changes in the model pellets due to the variation of the process parameters such as binder concentration, rotational speed, residence time in the process chamber should be thoroughly analysed. Using the DEM the relationship between the process variables and the particle properties should be modelled and simulated.