碳纤维增强树脂基复合材料组分疲劳强度表征

摘要

对微观力学失效(Micro-mechanics of failure,MMF)理论的应用做了扩展,将其用于分析连续纤维增强树脂基(FRP)复合材料的三维复杂结构的疲劳强度.基于MMF理论,建立了连续FRP复合材料层合板疲劳强度表征方法.分别对碳纤维/树脂(UTS50/E51)复合材料单向层合板进行静载和疲劳试验,得到层合板的基本力学性能和宏观强度指标;对UTS50/E51层合板组分疲劳强度进行了表征,得到了纤维和树脂的拉伸、压缩MMF疲劳特征参量S-lgN曲线,为MMF方法应用于连续纤维增强复合材料层合板结构的疲劳强度分析提供了判断依据.使用建立的方法对UTS50/E51多向层合板的拉伸疲劳强度进行了分析,并将预测结果与试验结果进行对比.%The application of theory of micro-mechanics of failure (MMF) was extended to analyze the fatigue strength for the complex three-dimensional of the continuous fiber reinforced polymer (FRP) composite.The fatigue strength analysis method of the continuous FRP laminate structure was established based on the MMF theory.The strength and mechanical properties of unidirectional laminate of UTS50/E51 were measured by the static loading and fatigue-loading test.The constituent fatigue MMF critical parameters of the UTS50/E51 laminate were characterized and the S-lgN curves of the tensile and compressive fatigue MMF critical parameters of the fiber and matrix were obtained,which provided basis for using the MMF theory to analyze the fatigue strength of the continuous FRP laminates structure.The fatigue tensile strength of the laminates structure of polymer composites was studied based on MMF.The fatigue tension tests for the laminates structure of UTS50/E51 laminate were carried out.The strengths obtained from both theoretical analysis and tests were compared.