Development of a two-sided coupled material model for the characterization of ideal process parameters of application-optimized foams

开发双面耦合材料模型，用于表征应用优化泡沫的理想工艺参数

• 批准号: 423793605
• 负责人: Professor Dr.-Ing. Stefan Diebels
• 金额: --
• 依托单位: Lehrstuhl für Angewandte Mechanik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/423793605?language=en
• 关键词: Development; two; sided; coupled; material

The growing world population and increasing prosperity lead to an increasing demand for energy and materials. Application-optimized cellular materials achieve greater sustainability and cost savings. This motivates the coating of open-pore polyurethane (PU) foams by electrochemical deposition for the production of hybrid foams. Material transport limitations during the electrode positioning process cause significant coating inhomogeneities that have not been adequately investigated so far. In this project, the influencing parameters on the electrodeposition process are to be determined and optimized. The aim is to develop a macroscopic two-side coupled material model to describe the electrodeposition process on porous materials.For the further development of the electrodeposition on PU foams, an electrochemical flow-through coating cell is developed and hybrid foams are produced with the aid of different parameter sets. A new method for the semi-destructive determination of the coating thickness of hybrid foams based on gravimetric measurements, measurements of the magnetic flux density using a Hall probe and computer tomography images is being developed for a time and cost effective method of measuring the coating thickness. The influence of the parameters velocity, diffusion constant, electric field and sink constant on the electrodeposition process and on the resulting coating thickness homogeneity will be formulated using a one-sided coupled macroscopic material model. The material model is implemented by finiter differences and the electrodeposition process is simulated. To describe the influence of the coating thickness on the electrodeposition process, the relationships of the geometric properties are investigated. These correlations are determined experimentally on the one hand and by virtual structures on the other hand. The correlations are required for modelling the influence of the coating thickness on the electrodeposition process. The two-side coupled material model is also implemented using finite differences and the electrodeposition process is simulated. Optimum process parameters of the electrodeposition process are determined by inverse calculation. These process parameters are used for the production of optimized hybrid foams with exactly this optimal parameter set. Finally, mechanical tests will be carried out on the optimized foams to investigate the influence of coating homogeneity on the material properties.Through these steps the project goal and thus a homogeneous coating thickness of Ni/PU hybrid foams shall be achieved. A homogeneous coating thickness gives the hybrid foams homogeneous material properties, which makes them multifunctional as energy absorbers or catalysts.

不断增长的世界人口和日益增长的繁荣导致对能源和材料的需求不断增长。应用优化的细胞材料可实现更大的可持续性和成本节省。这激发了通过电化学沉积来生产杂交泡沫的开放式聚氨酯（PU）泡沫的涂层。电极定位过程中的材料传输限制会导致迄今为止尚未进行充分研究的明显涂层不均匀性。在这个项目中，应确定和优化电沉积过程的影响参数。目的是开发一个宏观的两侧耦合材料模型，以描述多孔材料上的电沉积过程。对于PU泡沫上电沉积的进一步开发，开发了电化学流通涂层，并用不同参数集产生混合泡沫。 一种用于基于重量测量值的杂化泡沫涂层涂层的新方法，使用Hall探针和计算机断层扫描图像对磁通量密度进行测量，以进行时间和成本有效的测量涂层厚度的方法。参数速度，扩散常数，电场和水槽常数对电沉积过程以及所得涂层厚度均匀性的影响将使用单方面耦合的宏观材料模型进行配合。材料模型是通过罚款人差异实现的，并模拟了电沉积过程。为了描述涂层厚度对电沉积过程的影响，研究了几何特性的关系。这些相关性一方面是由实验确定的，另一方面是通过虚拟结构确定的。建模涂层厚度对电沉积过程的影响所需的相关性。还使用有限差异实现了两侧耦合材料模型，并模拟了电沉积过程。电沉积过程的最佳过程参数由反计算确定。这些过程参数用于使用此最佳参数集的优化混合泡沫的生产。最后，将在优化的泡沫上进行机械测试，以研究涂层均匀性对材料特性的影响。通过这些步骤，应实现Ni/PU混合泡沫的均匀涂层厚度。均匀的涂层厚度赋予杂化泡沫均匀的材料特性，这使它们成为能量吸收器或催化剂的多功能。