Multifunctional sensor yarns for real-time in situ detection of multiple damage mechanism for continuous structural integrity monitoring of components made of textile-reinforced composite materials

用于实时原位检测多重损伤机制的多功能传感器纱线，用于对纺织增强复合材料制成的组件进行连续结构完整性监测

• 批准号: 266143477
• 负责人: Professor Dr.-Ing. Chokri Cherif
• 金额: --
• 依托单位: Institut für Textilmaschinen und Textile Hochleistungswerkstofftechnik
• 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/266143477?language=en
• 关键词: Multifunctional; sensor; yarns; real; time

The research project focuses on the development of a novel coaxial sensor yarn with only three functional layers, equipped with reproducible quality and defined homogeneous geometry, which is designed as a precise and continuously melt-spun core/sheath bicomponent monofilament structure. The core consists of the thermoplastic polymer PEEK, which is percolatively mixed with electrically conductive particles and completely enclosed by a bare PEEK sheath without additives. This high-temperature resistant high-performance polymer is suitable for direct integration into all technically relevant thermoplastic and thermoset matrix systems. Furthermore, the research aims the process development for the realization of defined parameterizable electrical reflection gratings in the form of periodically impressed cross-sectional gradients in the nickel layer deposited wet-chemically on the core-sheath structure and acting as an outer conductor. Additionally, the development of a fiber-based measuring method based on electrical time-domain reflectometry (E-TDR) will be investigated for the first time. The hereby related high spatial resolution for the investigation of different stages or geometric characteristics of the development and propagation of multiple structural damage mechanisms has to be investigated. This is premise for their reliable non-destructiv-measurement as well as for the precisely localizable or globally differentiable in-situ detection in components made of fiber-reinforced plastic composites. The innovative approach is based on the integral production of such sensor yarns as bicomponent core/sheath monofilament yarns with strictly homogeneous, re-producible and short-circuit-free construction by means of melt-spinning technology further developed to meet manifold requirements. Two novel approaches based on electrical time-domain reflectometry are being pursued for the production of a versatile yarn-based and machine-processable combination sensor that can be used for a variety of measurements. A robust contacting solution must be developed for both.It is based on the working hypothesis that the stresses initiated in the FKV by external superimposed loads lead directly to detectable structural events that change the microstructure and, depending on their severity, cause only local or global geometric changes in the sensory coaxial conductor struc-ture integrated over the dimension of the component to be monitored. This global or local geometric deformation of the coaxial sensor in the area of the geometric reflection points allows the measurement of the local change of the wave impedance, which allows in combination with a tailored to be developed evaluation strategy a precise, spatially resolved (re)-localization of struc-ture changes caused by structural degradations.

该研究项目的重点是开发一种只有三个功能层的新型同轴传感器纱线，具有可重复的质量和定义的均匀几何形状，设计为精确的连续熔纺芯/鞘双组分单丝结构。芯由热塑性聚合物PEEK组成，其与导电颗粒混合，并完全由无添加剂的裸PEEK护套包围。这种耐高温的高性能聚合物适合直接集成到所有技术相关的热塑性和热固性基体系统中。此外，该研究的目标是工艺开发，以在湿化学沉积在芯-鞘结构上并充当外导体的镍层中周期性施加横截面梯度的形式实现定义的可参数化电反射光栅。此外，将首次研究基于电时域反射仪（E-TDR）的基于光纤的测量方法的发展。必须研究与此相关的高空间分辨率，用于研究多种结构损伤机制的发展和传播的不同阶段或几何特征。这是其可靠的非破坏性测量以及在纤维增强塑料复合材料制成的部件中进行精确定位或全局可区分的原位检测的前提。这种创新的方法是基于传感器纱线的整体生产，如双组分芯/鞘单丝纱线，具有严格均匀，可重复生产和无短路的结构，通过进一步开发的熔纺技术来满足多种要求。两种新的方法，电时域反射法的基础上正在追求生产一个多功能的纱线为基础的和机器可处理的组合传感器，可用于各种测量。必须为两者开发一种稳健的接触解决方案。它基于工作假设，即由外部叠加载荷在FKV中引发的应力直接导致可检测的结构事件，这些结构事件改变了微观结构，并且根据其严重程度，仅导致在待监测部件尺寸上集成的传感同轴导体结构的局部或全局几何变化。同轴传感器在几何反射点的区域中的这种全局或局部几何变形允许测量波阻抗的局部变化，这允许与定制的待开发的评估策略相结合，对由结构退化引起的结构变化进行精确的空间分辨（重新）定位。