摘要
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;孔洞直径减小至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。
Based on the partition modeling of the FSW joint with holes for 2024 aluminum alloy, the influence of the joint hole size on crack propagation was studied by experiments and finite element simulation. The results show that the mechanical properties of the joint increase with the decrease of the hole size under quasi-static service conditions. When the hole diameter is less than 0.1 mm the mechanical properties of the joint are basically the same as those without the defect and the fracture occurs in the heat affected zone. The weld nugget zone(WNZ) with hole defect fractures 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 with the increase of the hole size;there will be a temperature rise in the fracture and the fracture always takes place in the WNZ with the hole defect.
作者
胡志力
李锦
万心勇
庞秋
Hu Zhili;Li Jin;Wan Xinyong;Pang Qiu(Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan 430070,China;Hubei Collaborative Innovation Center for Automotive Components Technology,Wuhan 430070,China;Wuhan Donghu University,Wuhan 430212,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2019年第3期892-897,共6页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51405358)
中国汽车产业创新发展联合基金(U1564202)
新能源汽车科学与关键技术学科创新引智基地(B17034)
上海市复杂薄板结构数字化制造重点实验室开放课题(2017002)
