金属加工（热加工）Issue(12)：28-35,8.
Q355低碳钢焊接接头疲劳断裂行为及寿命评定
Fatigue fracture behavior and life assessment of Q355 low carbon steel welded joints
摘要
Abstract
The full-life fatigue behavior of Q355 low-carbon steel welded joints under cyclic loading was systematically investigated.Through experimental analyses of microstructure,crack initiation and propagation behavior,as well as temperature evolution,the fatigue evolution mechanism and energy dissipation characteristics of Q355 welded joints under cyclic loading are revealed.The surface temperature of the material during the fatigue process can be divided into four stages:initial rapid temperature rise,steady temperature rise,rapid temperature increase,and abrupt temperature drop.Compared to the base metal,the welded joints exhibit slightly reduced tensile strength,slightly increased yield strength,and nearly unchanged ductility.The fatigue limit of the Q355 welded joint is 390MPa.The crack propagation process follows the Paris law,with the crack growth rate increasing as the stress intensity factor increases.关键词
焊接接头/疲劳断裂/温度演变/疲劳裂纹扩展/Paris公式Key words
welded joint/fatigue fracture/temperature evolution/fatigue crack propagation/Paris law引用本文复制引用
张晓刚,陶飞洋,闫志峰..Q355低碳钢焊接接头疲劳断裂行为及寿命评定[J].金属加工（热加工）,2025,(12):28-35,8.基金项目
山西省基础研究计划项目(202203021221040). （202203021221040）
