The Joule heating of carbon fiber-based textiles enables an energy- and cost-efficient processing of carbon fiber reinforced thermoplastic parts. This article introduces a new method to pass direct current into a dry, not pre-consolidated hybrid yarn textile based on recycled carbon fibers and polyamide 6 fibers. The aim is to melt polyamide fibers, subsequently impregnate carbon fibers, and finally consolidate the material to form a composite part in a single process step. To increase the reliability of this technology, the electrical properties and the behavior of the material during the heating process must be thoroughly investigated. It will be addressed how the material is characterized during the process and how the changing resistivity of the textile affects the current flow between the electrodes to generate intrinsic heat. Moreover, a method to determine the effective material resistivity by finite element simulation on the fiber scale based on a CT scan is presented. Thus, a validated material model with respect to the temperature development in the textile based on ρ = ρ (Τ) was established.

中文翻译：

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焦耳加热过程中由再生碳和 PA6 纤维制成的不连续混合纱线纺织品的电特性表征

基于碳纤维的纺织品的焦耳加热使碳纤维增强热塑性部件的加工具有能源和成本效益。本文介绍了一种新方法，可将直流电传入干燥的、未预固结的基于再生碳纤维和聚酰胺 6 纤维的混合纱线纺织品。目的是熔化聚酰胺纤维，随后浸渍碳纤维，最后在单个工艺步骤中固结材料以形成复合材料部件。为了提高这项技术的可靠性，必须彻底调查材料在加热过程中的电气特性和行为。将讨论材料在该过程中的特性以及织物电阻率的变化如何影响电极之间的电流以产生固有热量。而且，提出了一种基于CT扫描在纤维尺度上通过有限元模拟确定有效材料电阻率的方法。因此，建立了基于 ρ = ρ (T) 的关于纺织品中温度发展的经过验证的材料模型。