6005A-T6铝合金搅拌摩擦焊接头的疲劳性能分析  

Fatigue Performance Analysis for Friction Stir Welding Joints of 6005A-T6 Aluminum Alloy

作　　者：周海鹏 邢松龄 韩赞东[3] 王旭东 沈旭奎 ZHOU Haipeng;XING Songling;HAN Zandong;WANG Xudong;SHEN Xukui(Beijing Rail Transit Technology and Equipment Group Co.,Ltd.,Beijing 100160,China;Beijing Infrastructure Investment Co.,Ltd.,Beijing 100101,China;Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]北京轨道交通技术装备集团有限公司,北京100160 [2]北京市基础设施投资有限公司,北京100101 [3]清华大学机械工程系,北京100084

出　　处：《热加工工艺》2025年第3期35-40,共6页Hot Working Technology

摘　　要：搅拌摩擦焊(FSW)接头的疲劳性能是保证其结构可靠性的关键因素,可用应力-寿命曲线(S-N曲线)表征,对于不同焊接条件的FSW接头均需要单独测定S-N曲线。针对6005A-T6铝合金的FSW试件,通过焊接试件的疲劳试验分析FSW接头的疲劳性能,估计了不同存活率下的S-N曲线。此外,分析了厚度对FSW接头疲劳性能的影响,对比了8 mm和16 mm两种厚度的焊接试件。结果表明,在95%置信度下,95%以上存活率的S-N曲线可用于指导抗疲劳设计。厚度对长寿命区的极限疲劳强度影响较小,不同厚度FSW接头的S-N曲线特征有所区别,与8 mm厚度的FSW接头相比,16 mm厚的接头在高应力水平下的疲劳寿命更长,S-N曲线更为陡峭。The fatigue performance of friction stir welding(FSW)joints is a key factor to ensure their structural reliability,which can be characterized by the stress-life curve(S-N curve).For FSW joints under different welding conditions,the S-N curve should be measured separately.The fatigue properties of 6005A-T6 aluminum alloy FSW joints were analyzed by fatigue tests of some welding specimens,and the S-N curves under different survival rates were estimated.In addition,the influence of thickness on the fatigue performance of FSW joints was analyzed,and the specimens with 8 mm and 16 mm thickness were compared.The results show that the S-N curves with more than 95%survival rates at 95%confidence can be used to guide the anti-fatigue design.The thickness has little influence on the ultimate fatigue strength in the long-life zone,but the characteristics of S-N curves of FSW joints with various thickness are different.The 16 mm thick joint has a longer fatigue life at high stress level and a steeper S-N curve compared to the 8 mm thick FSW joint.

关 键 词：搅拌摩擦焊 疲劳性能 应力-寿命曲线 

分 类 号：TG405[金属学及工艺—焊接]