Stress concentration has a significant effect on fatigue properties of welded butt joint of bogie.The influences of joint geometric parameters {weld edge transition arc radius r,weld toe inclination angle θ） on stre...Stress concentration has a significant effect on fatigue properties of welded butt joint of bogie.The influences of joint geometric parameters {weld edge transition arc radius r,weld toe inclination angle θ） on stress concentration coefficient Kt at weld toe and fatigue life N were studied based on the finite element software ABAQUS/FE-SAFE,and the parametric equations were founded based on regression analysis of Origin software.The results show that weld edge transition arc radius r plays the most important role in stress concentration coefficient Kt as well as weld toe inclination angle 0.For the same inclination angle θ,stress concentration coefficient Kt decreases gradually with transition arc radius r increasing.With inclination angle θ increases,the effect of transition arc radius r on stress concentration factor Kt is increasing continuously,also the effect of change in stress concentration coefficient Kt caused by r on fatigue life N is increasing continuously.While in the case of same weld edge transition arc radius r,stress concentration coefficient Kt increases with inclination angle θincreasing.With transition arc radius r increases,the effect of inclination angle θ on stress concentration factor Kt is decreasing constantly,the effect of change in stress concentration coefficient Kt caused by θ on fatigue life N is decreasing constantly.The associated parametric equations have important instructive significance for the improvement of stress concentration degree and fatigue life of welded butt joint for train bogie.展开更多
为研究由多构件构成的输电线耐张串金具在外部荷载作用下的疲劳寿命,提出了以多个静力组合荷载构成的工况计算疲劳寿命的方法.首先在Abaqus中建立输电线耐张串金具有限元模型,分别求解在随机风荷载作用下的动力分析和由不同组合荷载组...为研究由多构件构成的输电线耐张串金具在外部荷载作用下的疲劳寿命,提出了以多个静力组合荷载构成的工况计算疲劳寿命的方法.首先在Abaqus中建立输电线耐张串金具有限元模型,分别求解在随机风荷载作用下的动力分析和由不同组合荷载组成多工况静力分析的应力解.将其导入Fe-Safe中,计算动力工况和不同静力工况的疲劳寿命.以FOS(Factors of Strength)强度因子为评估指标,对比动力与静力工况的疲劳寿命结果的区别,探究不同静力工况的应力解对疲劳寿命结果的影响.结果表明:该方法可有效地提高此类结构的计算效率;非线性较强的U形挂环和球头挂环受初始应力影响较大,会产生较大的相对误差;但在实际载荷分量变化范围以内,各构件静力与动力工况的疲劳寿命预测结果相差不大.展开更多
基金supported by the National Natural Science Foundation of China(No.51365014)Natural Science Foundation of Jiangxi Province(No.20151BAB206007)
文摘Stress concentration has a significant effect on fatigue properties of welded butt joint of bogie.The influences of joint geometric parameters {weld edge transition arc radius r,weld toe inclination angle θ） on stress concentration coefficient Kt at weld toe and fatigue life N were studied based on the finite element software ABAQUS/FE-SAFE,and the parametric equations were founded based on regression analysis of Origin software.The results show that weld edge transition arc radius r plays the most important role in stress concentration coefficient Kt as well as weld toe inclination angle 0.For the same inclination angle θ,stress concentration coefficient Kt decreases gradually with transition arc radius r increasing.With inclination angle θ increases,the effect of transition arc radius r on stress concentration factor Kt is increasing continuously,also the effect of change in stress concentration coefficient Kt caused by r on fatigue life N is increasing continuously.While in the case of same weld edge transition arc radius r,stress concentration coefficient Kt increases with inclination angle θincreasing.With transition arc radius r increases,the effect of inclination angle θ on stress concentration factor Kt is decreasing constantly,the effect of change in stress concentration coefficient Kt caused by θ on fatigue life N is decreasing constantly.The associated parametric equations have important instructive significance for the improvement of stress concentration degree and fatigue life of welded butt joint for train bogie.
文摘为研究由多构件构成的输电线耐张串金具在外部荷载作用下的疲劳寿命,提出了以多个静力组合荷载构成的工况计算疲劳寿命的方法.首先在Abaqus中建立输电线耐张串金具有限元模型,分别求解在随机风荷载作用下的动力分析和由不同组合荷载组成多工况静力分析的应力解.将其导入Fe-Safe中,计算动力工况和不同静力工况的疲劳寿命.以FOS(Factors of Strength)强度因子为评估指标,对比动力与静力工况的疲劳寿命结果的区别,探究不同静力工况的应力解对疲劳寿命结果的影响.结果表明:该方法可有效地提高此类结构的计算效率;非线性较强的U形挂环和球头挂环受初始应力影响较大,会产生较大的相对误差;但在实际载荷分量变化范围以内,各构件静力与动力工况的疲劳寿命预测结果相差不大.
