Method and process development for the infiltration of truss structures made of fiber-reinforced plastics with multilayer variable-axial fiber architecture (MerVa-2)

具有多层可变轴向纤维结构的纤维增强塑料桁架结构渗透方法和工艺开发（MerVa-2）

• 批准号: 415041798
• 负责人: Professorin Dr.-Ing. Luise Kärger
• 金额: --
• 依托单位: Leibniz-Institut für Polymerforschung Dresden (IPF)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/415041798?language=en
• 关键词: Method; process; development; infiltration; truss

The MerVa-2 research project deals experimentally and numerically with the infiltration behavior of structural fiber-reinforced plastic (FRP) structures with multilayer variable-axial fiber architecture produced by the Tailored Fiber Placement (TFP) process. In the first project phase MerVa-1, the infiltration behavior of single-layer TFP structures was investigated experimentally and numerically using resin transfer molding. Comprehensive knowledge was gained about the infiltration behavior on micro, meso and macro scales as well as about the influence of the variable-axial fiber architecture on mold filling. In order to be able to develop reliable gating strategies for TFP structures, an understanding of the infiltration behavior of multilayer fiber architectures is furthermore of importance. The challenge in considering multilayer TFP preforms lies in the increased complexity of the textile structure. The stitching of multiple layers results in a multidimensional flow front that cannot be represented by a simple superposition of single layers. The reason for this is the development of flow channels through all layers as well as an additional compacting of the rovings, which results in a strongly heterogeneous filling behavior. In the second project phase, these more complex infiltration processes of multilayer TFP structures are to be understood and numerically modeled. For this purpose, the meso-structure as well as the meso-structure dependent infiltration behavior of multilayer variable-axial TFP preforms with different stitch patterns and ply orientations will be investigated experimentally. Based on the experimental results and measurements of the infiltrated structures, meso and macro models of typical multilayer TFP preforms are generated and evaluated with respect to existing infiltration faults. In addition, the scalability of the occurring effects will be analyzed and an approach will be developed to pass meso-model information beyond the homogenized permeability tensor to the macro-simulation where necessary. The overall objective of the project is to reliably model the infiltration of complex, multi-layer variable-axial TFP structures as well as possible faults in order to be able to safely plan, execute and evaluate infiltration processes virtually in the future.

MerVa-2研究项目通过实验和数值模拟研究了结构纤维增强塑料（FRP）结构的渗透行为，该结构具有通过定制纤维铺放（TFP）工艺生产的多层可变轴向纤维结构。在第一个项目阶段MerVa-1，单层TFP结构的渗透行为进行了实验和数值研究，使用树脂传递模塑。获得了关于微观、介观和宏观尺度上的渗透行为以及关于可变轴向纤维结构对模具填充的影响的全面知识。为了能够为TFP结构开发可靠的门控策略，了解多层纤维结构的渗透行为也非常重要。考虑多层TFP预成型件的挑战在于纺织结构的复杂性增加。多个层的缝合导致多维流动前沿，其不能由单个层的简单叠加来表示。其原因是通过所有层的流动通道的发展以及粗纱的额外压实，这导致强烈的非均匀填充行为。在第二个项目阶段，这些更复杂的渗透过程的多层TFP结构的理解和数值模拟。为此，将对具有不同缝合模式和铺层方向的多层变轴向TFP预制件的细观结构以及细观结构相关的渗透行为进行实验研究。基于渗透结构的实验结果和测量，典型的多层TFP预制件的细观和宏观模型的生成和评估相对于现有的渗透故障。此外，发生的影响的可扩展性将进行分析，并将开发一种方法，以通过细观模型信息超出均匀化渗透率张量的宏观模拟在必要的地方。该项目的总体目标是可靠地模拟复杂的多层变轴TFP结构的渗透以及可能的故障，以便能够在未来安全地计划，执行和评估渗透过程。