Developing a multifunctional, wireless sensor system for monitoring the process parameters during the production of carbon-fiber reinforced composites

开发多功能无线传感器系统，用于监测碳纤维增强复合材料生产过程中的工艺参数

• 批准号: 417571210
• 负责人: Professor Dr.-Ing. Martin Vossiek
• 金额: --
• 依托单位: Lehrstuhl für Hochfrequenztechnik
• 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/417571210?language=en
• 关键词: Developing; multifunctional; wireless; sensor; system

In a previous projec, a direct relation between the degree of curing of resin systems and their dielectric characteristics at 24 GHz was proven by correlating the curing curves of an innovate reaction kinetics model with permittivity curves. In addition, a novel batteryless, wireless 24GHz sensor for recording in-situ the permittivity and temperature during curing within a fiber composite structure was developed and successfully tested experimentally.Given that this sensor is suitable only for use in non-conductive fiber-reinforced composites (FRCs), the present project will investigate the extent to which it can be successfully adapted for use in FRCs with conductive carbon fibers (CFs), as carbon fiber reinforced composite structures must operate to the highest standards in structural components.The problem with carbon fiber reinforced polymers (CFRPs) is that the radio signal between sensor and scanner is highly attenuated by the conductive fibers. The attenuation depends mainly on the polarization of the electromagnetic fields and the fiber arrangement.In order to classify the effects of different textile layers, fiber volume ratios and polarizations, they will be characterized with, and without curing epoxy resin at different temperatures by means of a quasi-optical transmission system. This will determine at which configurations the material cannot be irradiated without additional measures. The transmissivity should be improved by introducing dielectric channels above the antennas. To this end, a concept is required for constructing the channels and for precisely inserting them before the structure is infused, so as to minimize any effects on the structural load capacity of the surrounding component. The sensor operating frequency should be increased, as well, in order to minimize the dimensions of sensor and channels – thus moderating the structural impact. Due to the newly added requirements, only the basic principle of operation for the sensor from the previous project can be applied in the new project. The sensor itself and the dielectric channels must be completely redesigned.A linked simulation model needs to be designed to first compute the mechanical impact of the embedded sensor and the associated channel on complex structures, and to determine the effects of sensor geometry and boundary-layer adhesion. The simulation thus supports the empirical optimization of sensor loading with respect to geometry and boundary layer.Based on the test results for the sensor components and structural mechanics, the final wireless sensor will be designed, assembled and tested in a fiber-composite curing process. Finally, the novel sensor will be tested in a real infusion process to verify its practical usability.

在之前的项目中，通过将创新反应动力学模型的固化曲线与介电常数曲线相关联，证明了树脂系统的固化程度与其在 24 GHz 下的介电特性之间的直接关系。此外，还采用了一种新型无电池无线 24GHz 传感器。用于原位记录纤维复合材料结构固化过程中的介电常数和温度的传感器已开发出来并成功进行了实验测试。鉴于该传感器仅适用于非导电环境纤维增强复合材料（FRC），目前的项目将研究其在多大程度上可以成功地应用于具有导电碳纤维（CF）的FRC，因为碳纤维增强复合材料结构必须按照结构部件的最高标准运行。碳纤维增强聚合物 (CFRP) 的问题在于传感器和扫描仪之间的无线电信号会被导电纤维严重衰减，衰减主要取决于电磁场和纤维的偏振。为了对不同织物层、纤维体积比和偏振的影响进行分类，将通过准光传输系统在不同温度下对有或没有固化环氧树脂进行表征，这将确定在哪种配置下。如果没有额外的措施，材料就不能被辐射。为此，需要一个概念来构建通道并在结构被灌注之前精确地插入它们，从而最大限度地减少任何辐射。对周围组件的结构负载能力的影响也应增加，以尽量减少传感器和通道的尺寸，从而减轻结构影响。先前项目的传感器操作可以应用于新项目。传感器本身和介电通道必须完全重新设计。需要设计一个链接的仿真模型，以首先计算嵌入式传感器和相关的机械影响。通道对复杂结构的影响，并确定传感器几何形状和因此，该模拟支持传感器负载在几何形状和边界层方面的经验优化。根据传感器组件和结构力学的测试结果，最终的无线传感器将在光纤中进行设计、组装和测试。 -复合固化过程。最后，新型传感器将在真实的灌注过程中进行测试，以验证其实际可用性。