Abstract The hybridisation of structural components is an effective way to increase its functionality and lightweight potential. By combining different materials and semi-finished products, lightweight and load-adapted components can be achieved. An effective technology is the overmoulding of hollow profiles to realise additional stiffening and fastening elements. For this purpose, a consolidated and dimensionally stable hollow profile is positioned in the injection mould and is overmoulded. It is known, that hollow profiles have to be supported by an internal medium to prevent the structure from collapsing due to the high injection pressure. Previous studies have shown that granulates are well suited as inner support cores. This paper shows the load-bearing behaviour of support granulates consisting of mono-disperse particles. The structural and material properties of the particles are studied experimentally. Subsequently, the load-bearing behaviour of granulates depending on the filling height is investigated and associated with the particle properties. Based on this, numerical studies based on the DEM are carried out to derive the relationship between the particle properties and the load-bearing behaviour of the granular core. Here, a strong dependence between the interparticle-friction as well as the particle stiffness and the deformation of the granulate under compression loading has been observed.

中文翻译：

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空心型材包覆成型过程中用作芯材的颗粒特性

摘要 结构部件的混合是增加其功能性和轻量化潜力的有效方法。通过组合不同的材料和半成品，可以实现轻量化和负载适应的组件。一种有效的技术是对空心型材进行包覆成型，以实现额外的加强和紧固元件。为此，在注塑模具中放置一个坚固且尺寸稳定的中空型材并进行二次成型。众所周知，中空型材必须由内部介质支撑，以防止结构因高注射压力而倒塌。先前的研究表明，颗粒非常适合作为内支撑芯。本文展示了由单分散颗粒组成的载体颗粒的承载行为。通过实验研究了颗粒的结构和材料特性。随后，研究了取决于填充高度的颗粒的承载行为，并将其与颗粒特性相关联。在此基础上，进行了基于 DEM 的数值研究，以推导出颗粒特性与颗粒核承载行为之间的关系。在这里，观察到颗粒间摩擦以及颗粒刚度和颗粒在压缩载荷下的变形之间存在很强的相关性。进行了基于 DEM 的数值研究，以推导出颗粒特性与颗粒核承载行为之间的关系。在这里，观察到颗粒间摩擦以及颗粒刚度和颗粒在压缩载荷下的变形之间存在很强的相关性。进行了基于 DEM 的数值研究，以推导出颗粒特性与颗粒核承载行为之间的关系。在这里，观察到颗粒间摩擦以及颗粒刚度和颗粒在压缩载荷下的变形之间存在很强的相关性。