Abstract In situ monitoring of strain and damage in fiber-reinforced composites provides critical information regarding the state of the material without requiring the structure to be removed from operation. In order to avoid the use of complex, heavy, and bulky sensor networks to track the state of the structure, recent focus has turned to multifunctional materials with inherent characteristics which enable in situ monitoring. This work investigates laser induced graphene (LIG) integrated within aramid fiber reinforced composites for damage and strain sensing during mechanical loading. The LIG used here fully integrates the sensing material within the composite as the piezoresistive graphene layer is coated directly onto the reinforcing aramid fabric prior to infusing the fibers with the supporting matrix. The sensing element is thus not susceptible to environmental effects and adds no extra weight while also maintaining the specific strength of the material. As strain and damage occur within the composite, the LIG proves capable of tracking strain and detecting plastic deformation in situ. Thus, the result of this work is the integration of a multifunctional component into aramid composites which possesses in situ sensing capabilities. Furthermore, the processes and materials are easily scalable for the large-scale production of multifunctional aramid fiber reinforced composites.

中文翻译：

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用于芳纶纤维增强复合材料中原位损伤传感的激光诱导石墨烯

摘要 纤维增强复合材料中应变和损伤的原位监测提供了有关材料状态的关键信息，而无需将结构从运行中移除。为了避免使用复杂、笨重和笨重的传感器网络来跟踪结构的状态，最近的焦点已转向具有能够进行原位监测的固有特性的多功能材料。这项工作研究了集成在芳纶纤维增强复合材料中的激光诱导石墨烯 (LIG)，用于在机械载荷期间进行损伤和应变传感。这里使用的 LIG 将传感材料完全集成到复合材料中，因为在将纤维与支撑基质灌注之前，压阻石墨烯层直接涂覆在增强芳纶织物上。因此，传感元件不易受环境影响，并且不会增加额外的重量，同时还能保持材料的特定强度。当复合材料内发生应变和损坏时，LIG 证明能够原位跟踪应变和检测塑性变形。因此，这项工作的结果是将多功能组件集成到具有原位传感能力的芳纶复合材料中。此外，这些工艺和材料易于扩展，可用于多功能芳纶纤维增强复合材料的大规模生产。这项工作的结果是将多功能组件集成到具有原位传感能力的芳纶复合材料中。此外，这些工艺和材料易于扩展，可用于多功能芳纶纤维增强复合材料的大规模生产。这项工作的结果是将多功能组件集成到具有原位传感能力的芳纶复合材料中。此外，这些工艺和材料易于扩展，可用于多功能芳纶纤维增强复合材料的大规模生产。