研究了不同方式超载,包括拉伸、压缩、拉伸-压缩和压缩-拉伸超载,对LY12铝合金疲劳裂纹扩展过程的影响。通过对不同超载前后裂纹尖端显微形貌及其附近塑性区尺寸与应变分布变化的研究和断口分析,指出:不同方式超载对裂纹扩展过程产生迥然不同的影响;拉伸超载引起的裂纹扩展速率递减延缓过程,是以闭合应力和残余压缩应力为主的多因素复合作用在裂纹尖端及其附近区域的结果。提出了拉伸超载对疲劳裂纹扩展过程影响的一般机制。
The effects of different modes of overload, including tensile, compressive, tensile-compressive and compressive-tensile, on the behaviour of fatigue crack propagation in LY12 A1 alloy were investigated. From a study of the changes in micro-morphology, the plastic zone size and strain distribution around the crack tip and the fracture analysis before and after various overloading, it is suggested that various modes of overload produce different influences on FCP, and the retardation behaviour of FCP after tensile overloading may be described as a combination effect of several factors acting on the crack tip and its surrounding region. A general mechanism of the effect of tensile overload on FCP behaviour is proposed.
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