航空材料学报2018，Vol.38Issue(2)：110-117,8.DOI:10.11868/j.issn.1005-5053.2017.000076
不同应力水平对碳纤维复合材料疲劳剩余刚度的影响
Effect of Different Stress Levels on Fatigue Residual Stiffness of Carbon Fiber Reinforced Composite
摘要
Abstract
In order to study the fatigue behavior of carbon fiber reinforced composite and the effect of stress level on its fatigue residual stiffness, monotonic tension tests and fatigue tests were conducted and the fracture morphology of carbon fiber composite was observed by using scanning electron microscope (SEM). The results show that the fatigue performance of carbon fiber reinforced composite is good at room temperature, and the cycle time is more than 106under 48% ultimate tensile strength. The decline rate of its residual stiffness is different under different stress levels. In the early stage of the fatigue, the decline rate of residual stiffness is relatively lower under high stress level, while it is higher under low stress level. In addition, the boundary characteristics of residual stiffness is also different under different stress levels. The boundaries under low stress are significant, while the boundaries under high stress are obscure. The results of fracture analysis show that with the decrease of stress level, the fatigue failure mode is complicated. Under high stress, the fracture of the fiber cluster is the main feature, while at low stress level the fatigue failure mode includes fiber and matrix fracture, interfacial debonding and fiber pull-out, etc.关键词
碳纤维复合材料/疲劳行为/应力水平/剩余刚度/断口Key words
carbon fiber reinforced composite/fatigue behavior/stress level/residual stiffness/fracture分类
机械制造引用本文复制引用
邱爽,周金宇..不同应力水平对碳纤维复合材料疲劳剩余刚度的影响[J].航空材料学报,2018,38(2):110-117,8.基金项目
江苏省高校自然科学研究重大项目(16KJA460002) （16KJA460002）
国家自然科学基金(51275221) （51275221）
