Macroscopic transition structures for a graded transition of properties in hybrid metal/polymer compounds - MÜGRA

用于混合金属/聚合物化合物性能分级转变的宏观转变结构 - MàGRA

• 批准号: 434351205
• 负责人: Professorin Dr.-Ing. Birgit Awiszus
• 金额: --
• 依托单位: Professur für Verbundwerkstoffe und Werkstoffverbunde
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/434351205?language=en
• 关键词: Macroscopic; transition; structures; graded; properties

The aim of the project "Macroscopic transition structures for a graded transition of properties in hybrid metal/polymer compounds" is the load-capable design of the metal/polymer interface in injection moulding of fibre-reinforced thermoplastics by means of variable metal structures. Due to the novel design of the transition zone in the range of the macroscopic scale, significantly higher mechanical loads of the material compound are possible. The main goal is to achieve a graded transition between the sheet metal and the polymer component by the use of transition structures. The graded geometric design of a permeable structure of wire spirals or machined cell structures should result in a graded transition of properties. A further focus is on the variable design of the transition structures in order to transmit forces for different load types. The material-physical modelling of the regularly arranged structures should form the basis for the simulation of the material compound behaviour in the transition area. The new findings of the material compound behaviour are elaborated on the material system made of galvanized steel sheet and short fibre reinforced polyamide. In order to join the transition structures to the metal component, joining processes are further developed, which allow an efficient application and high load capacity. In particular, the zinc layer on the steel sheet is used for joining the transition structures. The hybrid material compounds are produced by insert moulding the permeable transition structures. The aim is to examine the behaviour of highly viscous short-fibre-reinforced thermoplastic melts when passing through complex geometrical obstacles. The investigations are carried out experimentally and numerically, by fluid-structure interaction of CFD and FEM simulation. New knowledge is created about the shrinkage behaviour of (fibre-reinforced) thermoplastics in permeable structures as well as the alignment behaviour of the short fibre reinforcement as a result of flow through the structures depending on permeability and process technology parameters. The processes are examined systematically and improved iteratively. A significant improvement of the adhesion behaviour is expected in comparison with the form fit elements known from the state of the art.The actual occurring stresses in a metal/polymer hybrid component are characterised by complex superimposed stress states of the individual components. The resulting mechanical properties of the material system metal/transition structure/polymer are determined by suitable test specimen.

“混合金属/聚合物化合物中性能分级过渡的宏观过渡结构”项目的目标是通过可变金属结构对纤维增强热塑性塑料注射成型中的金属/聚合物界面进行负载能力设计。由于宏观尺度范围内过渡区的新颖设计，材料化合物的机械载荷可能显着提高。主要目标是通过使用过渡结构实现金属板和聚合物组件之间的分级过渡。螺旋线或机加工单元结构的渗透结构的分级几何设计应导致性能的分级转变。进一步的重点是过渡结构的可变设计，以便为不同的负载类型传递力。规则排列结构的材料物理建模应成为过渡区域材料复合行为模拟的基础。在镀锌钢板和短纤维增强聚酰胺制成的材料系统上阐述了材料复合行为的新发现。为了将过渡结构连接到金属部件，进一步开发了连接工艺，从而实现高效应用和高负载能力。特别地，钢板上的锌层用于连接过渡结构。混合材料复合物是通过插入模制可渗透过渡结构来生产的。目的是研究高粘性短纤维增强热塑性熔体在通过复杂几何障碍物时的行为。通过 CFD 和 FEM 模拟的流固耦合，以实验和数值方式进行研究。关于渗透性结构中（纤维增强）热塑性塑料的收缩行为以及短纤维增强材料因流经结构而导致的排列行为（取决于渗透性和工艺技术参数）产生了新的知识。对流程进行系统检查并迭代改进。与现有技术中已知的形状配合元件相比，预计粘附行为将得到显着改善。金属/聚合物混合部件中实际发生的应力的特征在于各个部件的复杂叠加应力状态。材料系统金属/过渡结构/聚合物的机械性能由合适的测试样本确定。