Physically motivated FEM material law based on the material and processing induced morphology during injection molding by unreinforced as well as reinforced thermoplastic materials

有一个赤字，在遣返现有的本构法半结晶热塑性塑料的基本物理粘结剂和过程，如他们的结晶。这阻碍了它们在FE模拟中的适用性。此外，结晶的基本机制和决定因素以及它们对宏观材料行为的影响仅得到部分理解。因此，不可能相对于预定的结晶度可靠地控制结晶过程。半结晶热塑性塑料是计算机辅助开发和优化混杂塑料-金属-复合材料的基础，而这与半结晶热塑性塑料的可靠和精确模拟是对立的。该项目的总体目标是了解混杂结构中结晶的原因和影响。这些研究应在未增强和增强（第二阶段成立）热塑性塑料上进行。需要这些结果来控制制造过程中的结晶并创建基于物理的本构律。拟议研究项目的目的是控制未增强热塑性塑料PA 6和PBT的结晶。实现这一目标的一个步骤是通过使用部分新的检测方法，对不同的、精确定义的工艺参数和材料特性（如熔体和模具温度、工具形貌和流变特性）的结晶特性进行实验表征。另一个目的是创建一个计算机模拟，基于具有自组织结构形成的“多粒子系统”，以再现半结晶热塑性塑料的固化，并进行一系列系统的模拟。应该可以通过实验确定可掌握的特征和相关性。基于现有的本构关系和模型，结合聚合物的宏观表征、光学结构分析和光学性质的实验结果，用预测模型对结晶过程进行了量热分析和模拟。产生的表示可以集成到新的材料模型中。将实验结果应用到有限元模拟中，以开发和优化混合热塑性金属复合材料是最终的目标。

There is a deficit in the repatriation of existing constitutive laws for semi-crystalline thermoplastics on basic physical coherences and processes, such as their crystallization. This impedes their applicability in FE-simulations. Furthermore, the basic mechanisms and determining factors for the crystallization and their effects on macroscopic material behavior are only partially understood. Accordingly, it is not possible to reliably control the crystallization process in relation to a predefined crystallinity degree. This opposes a reliable and precise simulation of semi-crystalline thermoplastics, which is the basis for computer-assisted development and optimization of hybrid plastic-metal-composites.The overall objective of the project is to understand the reasons and effects of the crystallization in hybrid-structures. These studies should be done on unreinforced and reinforced (second period of founding) thermoplastics. The results are required to control the crystallization during the manufacturing process and to create a physically based constitutive law.The aim of the proposed research project is the controlled crystallization of the unreinforced thermoplastics PA6 and PBT. One step to reach this aim is the experimental characterization of the crystallization peculiarity with different, precisely defined process parameters and material properties, like melt and mold temperature, tool topography and rheological properties, by using partially new inspection methods. Another aim is to create a computer simulation, based on a "multi-particle system" with self-organized structure formation to reproduce the solidification of semi-crystalline thermoplastics as well as to perform an array of systematical simulations. It should be possible to identify experimentally graspable characteristics and correlations. Therefore, the simulation allows to access experimentally inaccessible information about the crystallization process and enables its manipulation.Based on the state of the art, existing constitutive laws and models are transferred into the continuum mechanic representation together with experimental results of the macroscopic polymer characterization, the optical structure analyzes, the calorimetric crystallization analyzes and the simulation of crystallization by using the forecast model. The arising representation can be integrated into a new material model. To implement the experimental results into a FEM simulation for the development and optimization of the hybrid-thermoplastic-metall composites is the final objective.