铝合金非承载十字接头疲劳特性  

Fatigue property of aluminum non-load bearing cruciform joint

作　　者：刘永[1] 王苹[1] 马然[1] Pingsha Dong 方洪渊[1] 

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨150001 [2]密歇根大学船体制造与海洋工程系,美国安娜堡48109

出　　处：《焊接学报》2016年第8期83-86,132-133,共4页Transactions of The China Welding Institution

基　　金：哈尔滨工业大学先进焊接与连接国家重点实验室自主课题资助项目(13-M-02);哈尔滨工业大学创新基金资助项目(14-02)

摘　　要：基于结构应力法,计算拉伸疲劳加载时不同几何尺寸的7N01铝合金非承载十字接头的结构应力,并结合疲劳试验数据建立其疲劳失效的主S-N曲线.结果表明,与名义应力法相比,基于结构应力法的主S-N曲线线性相关性更好,能够适应不同几何尺寸十字接头疲劳的计算.进一步分析相同名义应力下,承载板厚度对疲劳寿命的影响,结果表明,接头疲劳承载能力的增加与板厚的增加并非线性关系,随着承载板厚度增加,接头疲劳寿命降低.The structural stress of 7N01 non-load bearing cruciform joints with different geometrical magnitude under fatigue loading was calculated,and the corresponding master S-N curve was obtained. The results show that,compared with the nominal stress based S-N curve,master S-N curve based on structural stress method shows much better linear correlation for cruciform joints with different geometry. The influence of plate thickness on fatigue strength was then analyzed. The results show that the relationship between load bearing ability and plate thickness is nonlinear. When nominal stress remains the same,fatigue life is reduced when plate thickness is increased.

关 键 词：结构应力法 疲劳 铝合金 非承载十字接头 

分 类 号：TG404[金属学及工艺—焊接]