摘要
本文主要对焊接接头的多轴高周疲劳评估方法展开研究.针对某管板焊接接头,分别采用Von Mises等效应力法、Eurocode3规范方法、IIW规范方法以及修正Whler曲线方法(MWCM)计算其多轴高周疲劳损伤寿命,并与试验寿命进行比较.对四种方法预测寿命的标准差进行分析.结果显示,等效应力法能够准确预测比例加载下的多轴高周疲劳寿命,但并不适用于估算非比例加载下的多轴疲劳损伤寿命,且预测结果偏于危险.MWCM既能够适用于比例加载下的多轴高周疲劳损伤寿命预测,也适用于非比例加载下的多轴高周疲劳损伤寿命预测,且预测寿命的标准差较小.
The multiaxial high-cycle fatigue assessment method for welded joints was carried out .Von Mises equivalent stress method, Eurocode3 recommended method , IIW recommended method and Modified Wohler Curve Method （ MWCM ） were used to evaluate multiaxial high-cycle fatigue life of tube-plate welded joints , and results were compared with experimental fatigue life.Then the standard errors of estimated fatigue life for the four methods were analyzed .Results show that equiva-lent stress method can only be used to calculate multiaxial high-cycle fatigue life under proportional added multiaxial loads, whereas MWCM performed well to evaluate multiaxial fatigue life for welded structures subject to both proportional and non-proportional added multiaxial loads , moreover has a small standard error .
出处
《大连海事大学学报》
CAS
CSCD
北大核心
2014年第3期108-112,共5页
Journal of Dalian Maritime University
基金
国家自然科学基金资助项目(51209046)
