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,2019,48(3):892~897.[Hu Zhili,Li Jin,Wan Xinyong,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.]
铝合金搅拌摩擦焊接头服役孔洞裂纹扩展规律研究
投稿时间:2017-08-22  修订日期:2017-10-12
中文关键词:  铝合金搅拌摩擦焊接头  裂纹扩展规律  分区建模  温升
基金项目: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)
中文摘要:
      铝合金搅拌摩擦焊拼焊时容易产生孔洞缺陷,降低了拼焊板整体的力学性能,但目前孔洞缺陷对于拼焊接头服役裂纹扩展的影响规律尚不清楚,极大限制了拼焊板的应用。本文以不同尺寸孔洞缺陷的2024铝合金搅拌摩擦焊接头为研究对象,在对接头进行分区建模基础之上,通过试验和有限元数值模拟研究了接头孔洞大小对接头服役裂纹扩展的影响规律。研究表明接头在准静态服役条件下,力学性能随孔洞减小而不断提高;孔洞直径降低至0.1 mm时,接头力学性能与无缺陷接头相同,断裂于热影响区;而当孔洞直径大于0.1 mm时,接头均断裂于含有孔洞缺陷的焊核区。在交变载荷服役条件下,接头疲劳力学性能随孔洞减小而不断提高,随孔洞增大对载荷的敏感性逐渐降低;断裂的瞬间断口会有温升现象且均断裂于有孔洞缺陷的焊核区。
Study on crack propagation law of hole in aluminum alloy friction stir welding joint
英文关键词:aluminum alloy FSW  crack propagation  partition modeling  temperature rise
英文摘要:
      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.
作者单位E-mail
胡志力 武汉理工大学 11624556@qq.com 
李锦 武汉理工大学 1033267014@qq.com 
万心勇 武汉理工大学  
庞秋 武汉东湖学院  
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