纤维金属层板的疲劳裂纹扩展行为及预测方法研究进展

Development of Fatigue Crack Growth Behaviors and Prediction Methods for Fiber Metal Laminates

纤维金属层板(Fiber Metal Laminates,简称FMLs)是一种由金属薄板和纤维增强复合材料组成的层间混杂复合材料,具有优良的疲劳和损伤容限性能,是飞机结构的理想材料。纤维金属层板的疲劳损伤模式较为复杂,既有金属层内的裂纹扩展,又有金属/纤维层间的分层扩展,两者相互作用,增加了层板裂纹扩展速率与寿命预测的难度。国内外学者对纤维金属层板的疲劳裂纹扩展行为开展了大量的研究并取得了一定的成果。本文介绍了纤维金属层板的疲劳损伤机制,总结了恒幅载荷下纤维金属层板的疲劳裂纹扩展行为预测模型,并对变幅载荷下纤维金属层板的疲劳裂纹扩展及分层行为研究进行了概述。

Fiber Metal Laminates (FMLs) are advanced hybrid materials combining the excellent fatigue and damage tolerant properties of metals and fiber reinforced composites, which are ideal materials for aerospace. The fatigue crack growth behavior of FMLs is complex, which includes both crack growth in the metal layers and delamination growth at the metal/fiber interfaces in wake of the metal crack. This interaction makes it harder for the prediction of crack growth rate and damage tolerance. The fatigue crack growth behavior of FMLs has been studied by many researches and valuable results were obtained. In this paper, the fatigue damage mechanism of FMLs is reviewed. The prediction models for fatigue crack growth rate and life of FMLs under constant amplitude (CA) loading are summarized. Furthermore, the researches on fatigue crack growth and delamination behaviors of FMLs under variable amplitude (VA) loading are also overviewed.