腐蚀环境下吊索的2 100 MPa级高强钢丝拉弯疲劳性能研究OA
Tensile-Bending Fatigue Performance of 2 100 MPa High Strength Steel Wire for Sling under Corrosive Environment
针对2 100 MPa级高强钢丝桥梁吊索,进行腐蚀环境下高强钢丝的拉弯疲劳试验,并结合数值仿真分析应力幅、偏角、荷载频率对高强钢丝疲劳寿命的影响规律,研究腐蚀环境下高强钢丝的拉弯疲劳性能,提出基于实际应力特征的腐蚀环境下高强钢丝拉弯疲劳寿命Weibull分布,根据试验结果进行参数估计和验证,进一步得到不同概率保证率的应力-循环次数曲线表达式.结果表明:在腐蚀环境中蚀坑的分布具有随机性,当蚀坑位置、高应力区重合时,将加速裂纹萌生和扩展,在腐蚀环境下拉弯疲劳钢丝断口裂纹扩展区有明显的圆弧状条带;在腐蚀环境下高强钢丝拉弯疲劳寿命随应力幅与偏角的增大递减,偏角导致的弯曲应力可使高强钢丝疲劳寿命降幅达80％以上;不同概率保证率的应力-循环次数曲线表达式能较好地反映腐蚀环境下高强钢丝的疲劳性能.
Aiming at the 2 100 MPa grade high strength steel wire bridge sling,the tensile bending fatigue performance of high strength steel wire under corrosive environment was studied by means of experiment and numerical simulation.The tensile-bending fatigue test of 2 100 MPa high strength steel wire under corrosive environment was carried out.The influence of stress amplitude,deflection angle and load frequency on fatigue life was studied by numerical simulation.The Weibull distribution of the tensile-bending fatigue life of high strength steel wire under corrosive environment based on the actual stress characteristics was proposed.The parameters were estimated and verified according to the test results,and the expression of the stress-cycle number curve with different probability guarantee rates was further obtained.The results show that:the distribution of corrosion pits in the corrosive environment is random.When the location of corrosion pits coincides with high stress areas,it accelerates the initiation and propagation of cracks.In the corrosive environment,the fracture crack propagation zone of the tension-bending fatigue steel wire exhibits distinct circular arc-shaped stripes.In the corrosive environment,the tension-bending fatigue life of high-strength steel wire decreases with the increase of stress amplitude and deflection angle.The bending stress caused by the deflection angle can reduce the fatigue life of high-strength steel wire by up to 80％or more.The stress-cycle number curve expressions with different probability assurance rates can well reflect the fatigue performance of high-strength steel wire in the corrosive environment.
肖林;严李琪;张鸿洋;柳青;卫星;万田保;胡秀成
西南交通大学 土木工程学院,四川 成都 610031||桥梁智能与绿色建造全国重点实验室,四川 成都 611756西南交通大学 土木工程学院,四川 成都 610031||桥梁智能与绿色建造全国重点实验室,四川 成都 611756西南交通大学 土木工程学院,四川 成都 610031||桥梁智能与绿色建造全国重点实验室,四川 成都 611756西南交通大学 土木工程学院,四川 成都 610031||桥梁智能与绿色建造全国重点实验室,四川 成都 611756西南交通大学 土木工程学院,四川 成都 610031||桥梁智能与绿色建造全国重点实验室,四川 成都 611756桥梁智能与绿色建造全国重点实验室,四川 成都 611756||中铁大桥勘测设计院集团有限公司,湖北 武汉 430000昆明理工大学 冶金与能源工程学院,云南 昆明 650093
交通工程
桥梁吊索高强钢丝腐蚀环境拉弯疲劳试验疲劳性能疲劳寿命
BridgeSlingHigh strength steel wireCorrosion environmentTension bending fatigue testFatigue performanceFatigue life
《中国铁道科学》 2026 (3)
174-184,11
国家重点研发计划项目(2022YFB3706703)
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