在拉-拉载荷下测定了(Al2O3)f/Al复合材料的疲劳寿命(S-N)曲线.通过夭折试验以及SEM疲劳断口和纵截面组织结构分析,研究了复合材料的疲劳损伤模式.研究结果表明,(Al2O3)f/Al复合材料的疲劳极限为750 MPa,远高于SCS-6碳化硅纤维增强钛基复合材料.该复合材料兼有钛基和树脂基纤维复合材料疲劳损伤的特点,高应力下由单个裂纹的起源和生长导致复合材料的失效;低应力下,疲劳损伤模式包括纤维劈裂、众多基体裂纹和单个基体裂纹的横向扩展.其中纤维劈裂是主控机制.其更高的疲劳极限可归因于低应力下纤维的纵向劈裂.
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