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繁荣导致对能源和材料的需求不断增加。应用优化的蜂窝材料可实现更大的可持续性和成本节约。这促使通过电化学沉积来涂覆开孔聚氨酯（PU）泡沫以用于生产混合泡沫。电极定位过程中的材料运输限制导致迄今为止尚未充分研究的显著涂层不均匀性。本课题主要研究电沉积过程中的影响因素。为了进一步研究聚氨酯泡沫材料的电沉积过程，开发了电化学流通式涂布槽，并在不同的参数设置下制备了聚氨酯泡沫复合材料。 基于重量测量、使用霍尔探针的磁通量密度测量和计算机断层扫描图像的混合泡沫的涂层厚度的半破坏性测定的新方法正在开发用于测量涂层厚度的时间和成本有效的方法。参数速度，扩散常数，电场和下沉常数对电沉积过程和所得涂层厚度均匀性的影响将使用单侧耦合宏观材料模型来制定。用有限差分法实现了材料模型，并对电沉积过程进行了模拟。为了描述涂层厚度对电沉积过程的影响，研究了几何性质之间的关系。这些相关性一方面通过实验确定，另一方面通过虚拟结构确定。这些相关性对于模拟涂层厚度对电沉积过程的影响是必需的。采用有限差分法建立了双面耦合材料模型，并对电沉积过程进行了模拟。通过反算确定了电沉积工艺的最佳工艺参数。这些工艺参数用于生产具有该最佳参数组的最佳混合泡沫。最后，对优化后的泡沫材料进行力学性能测试，研究涂层均匀性对材料性能的影响，从而达到Ni/PU复合泡沫材料涂层厚度均匀的目的。均匀的涂层厚度赋予混合泡沫均匀的材料性质，这使得它们具有作为能量吸收剂或催化剂的多功能性。