D1: Characterization and modelling of the thermomechanical material behavior of 3D textilereinforced aluminium matrix composites (3D DF/Al-MMC)

为了开发3D纺织增强碳纤维铝基复合材料(3D CF/Al-MMC)在热机械载荷方面的轻量化潜力，需要可靠的制造技术和可靠的结构和失效分析方法。该项目的目标是开发一种适用于原型和小批量生产的改进型气体压力渗透(MGPI)技术，作为大批量生产的压铸技术的补充。对于一种新型的MGPI装置，开发了一种精细的工艺控制，能够减少温度暴露，调整纤维预制件预热和更高的冷却速度，以确保基于特殊涂层纺织品预制件(非卷曲针织面料)和改性铝合金的可重复的高质量制造CF/Al-MMC。为了进一步对CF/Al-MMC轻质构件进行结构分析和强度验证，应在细观和宏观尺度上发展和实验验证材料和结构模型以及失效准则，同时考虑到材料的非均质性和各向异性。在不同温度下的平面和管状试件的单轴和多轴应力实验中，利用原位层析成像确定了材料和破坏模型所需的材料特性和模型参数。

In order to exploit the lightweight potential of 3D textile-reinforced carbon-fibre aluminium composites (3D CF/Al-MMC) for thermomechanical loadings, both robust manufacturing technologies and reliable methods for structural and failure analyses are requested. Goal of the project is the development of a modified gas pressure infiltration (mGPI) technology suitable for prototype and small-batch production as a complement to die-casting technology for large-batch production. For a novel mGPI unit, a refined process control, enabling reduced temperature exposures, adapted fibre preform preheating and higher cooling rates, is developed to ensure a reproducible high-quality manufacture of CF/Al-MMC on the basis of specially coated textile preforms (non-crimp knitted fabrics) and modified Alalloys. For a future structural analysis and proof of strength of CF/Al-MMC lightweight components, the development and experimental validation of material and structural models as well as failure criteria on a mesoscopic and macroscopic scale, taking into account the heterogeneous and anisotropic material characteristic, are aimed at. Material properties and model parameters required for the material and failure models are determined in single and multi-axial stress experiments using in-situ tomography on planar and tubular specimens at different temperatures.