Development of semi-elliptic fatigue cracks in AK6 aluminium alloy under biaxial loading

被引:10
作者
Shanyavskii, AA
机构
[1] Research Institute of Civil Aviation, Moscow
关键词
crack growth mechanisms; biaxial fatigue; striations; fracture surface particles; equivalent stress intensity factor;
D O I
10.1111/j.1460-2695.1996.tb00180.x
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Fatigue mechanisms are investigated in AK6 aluminum alloy under biaxial loading. The development of a semi-elliptic crack under conditions of biaxial compression-tension is connected with the emergence of spherical particles. A mechanism of rotational instability is suggested, connecting the processes of particle formation with a specific mechanism of material failure. A similarity is revealed in the formation of fatigue striations within the studied ratio lambda of biaxial loads from -0.9 to +0.9. As lambda increases, the crack-growth rate also increases. It is suggested that this be allowed for when introducing a correction to the mode I stress-intensity factor.
引用
收藏
页码:1445 / 1458
页数:14
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