Li Weibin, Xu Chunguang, Cho Younho
School of Aerospace Engineering, Xiamen University, Xiamen 361005, China.
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100041, China.
Sensors (Basel). 2016 Feb 19;16(2):260. doi: 10.3390/s16020260.
Laminate composites which are widely used in the aeronautical industry, are usually subjected to frequency variation of environmental temperature and excessive humidity in the in-service environment. The thermal fatigue and moisture absorption in composites may induce material degradation. There is a demand to investigate the coupling damages mechanism and characterize the degradation evolution of composite laminates for the particular application. In this paper, the degradation evolution in unidirectional carbon/epoxy composite laminates subjected to thermal fatigue and moisture absorption is characterized by Lamb waves. The decrease rate of Lamb wave velocity is used to track the degradation evolution in the specimens. The results show that there are two stages for the progressive degradation of composites under the coupling effect of thermal cyclic loading and moisture diffusion. The present work provides an alternative to monitoring the degradation evolution of in-service aircraft composite Laminates.
广泛应用于航空工业的层压复合材料，在服役环境中通常会受到环境温度的频率变化和过高湿度的影响。复合材料中的热疲劳和吸湿可能会导致材料性能下降。对于特定应用，需要研究复合材料层压板的耦合损伤机制并表征其退化演变。本文通过兰姆波对单向碳/环氧复合材料层压板在热疲劳和吸湿作用下的退化演变进行了表征。利用兰姆波速度的下降率来跟踪试样的退化演变。结果表明，在热循环载荷和水分扩散的耦合作用下，复合材料的渐进退化存在两个阶段。本研究为监测现役飞机复合材料层压板的退化演变提供了一种替代方法。
