Structural health monitoring of fiber reinforced composites is an extensive field of research that aims to reduce maintenance costs through in-situ damage detection. However, the need for externally bonded sensor systems and complicated fabrication processes limit the widespread application of most current structural health monitoring techniques. This work introduces a novel multifunctional fiber reinforced composite that relies on a ferroelectric prepreg fabricated using dehydrofluorinated (DHF) polyvinylidene fluoride (PVDF), which exhibits a thermally stable piezoelectric response. The self-sensing material presented in this work requires minimal external components, as the piezoelectric sensing mechanism is fully contained within the composite. This is accomplished by fabricating a ferroelectric prepreg consisting of DHF PVDF infused woven fiberglass, which is sandwiched between woven carbon fabric layers that act as electrodes, thus forming a piezoelectric sensor fabricated with entirely structural composite materials. Notably, the sensing material is a fully distributed prepreg rather than discretely embedded sensors which enables simplified monitoring of complex structures. As the composite experiences damage under flexural and tensile loading, the internal change in strain results in a charge separation that is detectable as a voltage emission across the sample electrodes. The self-sensing capabilities of this material are explored using traditional mechanical testing techniques, showing comparable performance to common damage detection methods, all while eliminating the need for external bonding of sensors to the structure.

纤维增强复合材料的结构健康监测是一个广泛的研究领域，旨在通过原位损伤检测来降低维护成本。然而，对外部粘合传感器系统和复杂制造工艺的需求限制了大多数当前结构健康监测技术的广泛应用。这项工作介绍了一种新型多功能纤维增强复合材料，该复合材料依赖于使用脱氟化氢 (DHF) 聚偏二氟乙烯 (PVDF) 制造的铁电预浸料，该材料具有热稳定的压电响应。这项工作中提出的自感应材料需要最少的外部组件，因为压电感应机制完全包含在复合材料中。这是通过制造由 DHF PVDF 注入的编织玻璃纤维组成的铁电预浸料来实现的，该预浸料夹在充当电极的编织碳纤维层之间，从而形成由完全结构复合材料制成的压电传感器。值得注意的是，传感材料是一种完全分布的预浸料，而不是离散嵌入的传感器，可以简化对复杂结构的监测。由于复合材料在弯曲和拉伸载荷下受到损坏，应变的内部变化导致电荷分离，可检测到样品电极上的电压发射。使用传统的机械测试技术探索了这种材料的自感能力，表现出与常见的损伤检测方法相当的性能，