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胡志力,李锦,万心勇,庞秋.铝合金搅拌摩擦焊接头服役孔洞裂纹扩展规律研究[J].稀有金属材料与工程(英文),2019,48(3):892~897.[Hu Zhili,Li Jin,Wan Xinyong and Pang Qiu.Study on crack propagation law of hole in aluminum alloy friction stir welding joint[J].Rare Metal Materials and Engineering,2019,48(3):892~897.]
Study on crack propagation law of hole in aluminum alloy friction stir welding joint
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Received:August 22, 2017  Revised:October 12, 2017
DOI:
Key words: aluminum alloy FSW  crack propagation  partition modeling  temperature rise
Foundation item:国家自然科学基金资助项目(项目号51405358);中国汽车产业创新发展联合基金资助(项目批准号U1564202);新能源汽车科学与关键技术学科创新引智基地资助(项目号B17034);上海市复杂薄板结构数字化制造重点实验室开放课题资助(项目号2017002)
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Hu Zhili,Li Jin,Wan Xinyong and Pang Qiu  
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Abstract:
      Aluminum alloy friction stir welding (FSW) tends to produce hole defects, reducing the mechanical properties of Tailor Welded Blanket (TWB). However, the effect of hole defects on the crack propagation of welding joints is not clear yet,which greatly limits the application of tailor-welded blanks. Based on the partition modeling of the FSW joint with holes for 2024 aluminum alloy, the paper studied the influence law of hole size of joint on crack propagation through the tests combined with the finite element method. The results show that the mechanical properties of the joint increase with the decrease of the hole size under quasi-static service conditions, the heat affected zone is fractured, the mechanical properties of the joint are basically the same as those without the defect when the hole diameter is less than 0.1 mm; WNZ with hole defect is fractured when the diameter of the hole is larger than 0.1 mm. The fatigue properties of the joint increase with the decrease of the hole size under the condition of fatigue load, and the sensitivity to the load decreases gradually; there will be a temperature rise in the fracture and the fracture always takes place in the WNZ with hole defect.