Stress ratio effect on crack growth behavior of dissimilar friction stir welded butt joint between AA6061 and AA7075 alloys

被引：1
作者：
Gope, Aditya [1 ]
Kandwal, Abhishek [2 ]
Gope, Prakash Chandra [2 ]
机构：
[1] Biju Pattna Univ Technol, Coll Engn & Technol, Mech Engn Dept, Bhubaneswar, Odisha, India
[2] GB Pant Univ Agr & Technol, Coll Technol, Mech Engn Dept, Udham Singh Nagar 263145, Uttarakhand, India
来源：
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE | 2023年 / 237卷 / 04期
关键词：
Friction stir welding; dissimilar friction stir joint; crack growth; stress ratio; crack opening stress; MECHANICAL-PROPERTIES; WELDING PARAMETERS; R-RATIO; ALUMINUM-ALLOYS; DRIVING-FORCE; FATIGUE; MICROSTRUCTURE; CLOSURE; 6061-T6; AA6082-T6;
D O I：
10.1177/09544062221123950
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Many engineering components are subjected to random nature of loading during their life period. In this work, the fatigue crack growth in friction stir welded dissimilar AA6061 and AA7075 was investigated under different stress ratio. AA6061 was kept on the advancing side due to having a higher solidus temperature and softer than AA7075 for smooth material flow. The microstructure characterization, tensile and crack growth behavior was studied. It was observed that the joint material exhibited lower strength and ductility as compared to the base material. About 41%, 34%, and 66% reduction in tensile strength, yield strength, and percentage of elongation as compared to AA6061 (base material) were observed. About 27% higher hardness in the HAZ of retreating side than the advancing side was noticed. The crack deflection and tortuosity features were observed in the fatigue fractured specimens. In this paper, a comparative study using different crack growth models has been studied and a simple crack growth rate equation has been proposed considering the crack closure effect.
引用
收藏
页码：886 / 902
页数：17
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