Yan Guang, Wan Boli, Huang Heng, Li Wuyi
College of Instrument Science and Opto-Electronics Engineering, Beijing Information Science & Technology University, Beijing 100101, China.
Research Institute of Aero-Engine, Beijing University of Aeronautics and Astronautics, Beijing 102206, China.
Polymers (Basel). 2024 Dec 19;16(24):3543. doi: 10.3390/polym16243543.
Carbon fiber-reinforced polymer (CFRP) composites are widely used in aviation thermal insulation layers due to their high strength-to-weight ratio and excellent high-temperature performance. However, challenges remain regarding their structural integrity and durability under extreme conditions. This study first employed finite element simulation to model the damage evolution of CFRP laminated plates under axial tensile loads and their thermal decomposition behavior in high-temperature environments, providing a theoretical reference. Subsequently, experimental research was conducted on CFRP laminated plates embedded with fiber Bragg grating (FBG) sensors. In the tensile tests, FBG sensors accurately monitored the entire process from elastic deformation to damage propagation and eventual failure. In the high-temperature tests, despite a 75% reduction in tensile strength, FBG sensors effectively monitored damage evolution. Conclusively, the results demonstrate that FBG sensors possess reliable monitoring capabilities under complex conditions, making them a promising solution for the long-term structural health monitoring of aviation thermal insulation materials and paving the way for future developments in this area.
碳纤维增强聚合物（CFRP）复合材料因其高比强度和优异的高温性能而广泛应用于航空隔热层。然而，在极端条件下，其结构完整性和耐久性仍面临挑战。本研究首先采用有限元模拟对CFRP层压板在轴向拉伸载荷下的损伤演化及其在高温环境中的热分解行为进行建模，提供理论参考。随后，对嵌入光纤布拉格光栅（FBG）传感器的CFRP层压板进行了实验研究。在拉伸试验中，FBG传感器准确监测了从弹性变形到损伤扩展直至最终失效的全过程。在高温试验中，尽管拉伸强度降低了75%，FBG传感器仍有效监测了损伤演化。结果表明，FBG传感器在复杂条件下具有可靠的监测能力，使其成为航空隔热材料长期结构健康监测的一个有前途的解决方案，并为该领域的未来发展铺平了道路。
