闫文峰,王瑞杰,刘国寿,梁兴龙,张林欢,代恒源

• 1:昆明理工大学机电工程学院
• 2:昆明理工大学建筑工程学院

摘要(Abstract)：

采用搅拌摩擦焊(Friction stir welding,FSW)工艺制备了两种不同搭接形式的5083-O/6061-T6异种铝合金焊接接头,并对它们进行了恒幅疲劳加载测试。分别使用光学显微镜和扫描电镜对焊缝横截面显微组织和疲劳断口进行观察。结合有限元应力分析,分别采用缺口应力法和热点应力法对两种搭接接头进行疲劳寿命预测。疲劳测试结果表明:两种搭接接头疲劳失效均发生在上板,相同应力水平下6061在上板的试件疲劳性能优于5083在上板的试件疲劳性能。寿命预测结果表明:两种寿命预测方法均可以用来预测搭接接头的疲劳寿命,缺口法的预测结果优于热点应力法;钩状缺陷的存在降低了有效搭接厚度,导致接头的疲劳寿命降低。

关键词(KeyWords)： 异种铝合金;搅拌摩擦焊;钩状缺陷;疲劳寿命预测;显微组织

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51065012)

作者(Author): 闫文峰,王瑞杰,刘国寿,梁兴龙,张林欢,代恒源

DOI: 10.13289/j.issn.1009-6264.2024-0351

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