研究了Ⅱ、Ⅲ型过载对Ⅰ型疲劳裂纹扩展行为的影响并与Ⅰ型过载进行比较.结果表明:单周Ⅱ、Ⅲ型过载也延迟了其后的Ⅰ型疲劳裂纹扩展,但作用程度小于Ⅰ型过载;过载延迟效应随过载时基础载荷的降低和过载比的加大而增强,在近门槛区过载表现为疲劳裂纹扩展停止、疲劳门槛提高,在高基础载荷过载时疲劳裂纹则延缓、减速扩展.过载延迟行为主要由裂尖尾迹塑性诱导裂纹闭合和裂尖附近残余压应力状态引起.
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