武陇岗,王瑞杰,刘飞,覃秋雷,常亚光,王钟德

• 1:昆明理工大学机电工程学院
• 2:合肥工业大学材料科学与工程学院

摘要(Abstract)：

对镁合金AZ31B/钛合金TA15异种材料电阻点焊拉剪接头进行了恒幅疲劳测试，并使用扫描电镜观察了疲劳断口特征。在实验中观察到，在不同的载荷水平下，试件有两种失效模式。在实验结果的基础上，对点焊试件建立有限元模型，分析了焊点附近的弹塑性应力应变。进而分别应用缺口应力法和局部应力应变法预测点焊接头的疲劳寿命，并与实验寿命进行比较，同时也对其他论文中的相关数据进行了探讨。有限元分析及疲劳寿命预测结果表明：应力、应变集中主要位于焊核周围的缺口根部的镁合金一侧；试件表面的电极压痕深度对于疲劳预测结果影响不大；缺口应力法预测的疲劳寿命与实验寿命相比，结果相对保守；而使用局部应力应变法中的两种损伤式预测结果表明，Smith-Watson-Topper(SWT)法预测的结果比Manson-Coffin(MC)法更合理。

关键词(KeyWords)： 异种材料;电阻点焊;断口形貌;应力应变集中;疲劳寿命

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51065012)

作者(Author): 武陇岗,王瑞杰,刘飞,覃秋雷,常亚光,王钟德

DOI: 10.13289/j.issn.1009-6264.2021-0439

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