材料科学与工程学报2024，Vol.42Issue(3)：394-404,11.DOI:10.14136/j.cnki.issn1673-2812.2024.03.006
Q960D高性能钢疲劳裂纹扩展影响因素分析
Analysis of Influencing Factors of Fatigue Crack Propagation of Q960D High Strength Steel
摘要
Abstract
In order to study the fatigue crack growth behavior of Q960D high-performance steel(HPS),the effect of several key parameters on the fatigue crack growth was numerically analyzed by using CT compact tensile specimens.The fatigue crack growth length,cycle numbers and stress intensity factor based on the numerical simulation were compared with the experimental data,and it was found that the established finite element model had a good agreement.The relationship between the number of cycles and the crack propagation length,and the corresponding stress intensity factors were obtained by combining the fracture mechanics theory and contour integral.The effects of loading,stress ratio,sample thickness,crack depth ratio,initial crack angle,and corrosion pits on the stress intensity factors during the crack growth process of the HPS were revealed.The results show that the crack growth rate become greater as the load is higher.With the increase of stress ratio and thickness,the crack growth rate decreases,but the fatigue life increases.It is easier to fracture when the rack depth ratio is higher.More attention should be paid to the effective crack length in engineering practice.The initial crack angle of 46° is a critical angle of the crack stress intensity factor mutation.When the initial crack angle is 0°,the crack tip stress is the largest and fracture is most likely to occur.In the case of corrosion pit,the K value around the corrosion pit gradually decreases along the thickness direction,and the crack tip around the corrosion pit will first reach the yield state,accelerating the fatigue fracture of the test piece,and finally leading to the reduction of life.关键词
桥梁工程/高性能钢/疲劳裂纹/数值模拟/应力强度因子Key words
Bridge engineering/High performance steel/Fatigue crack/Numerical simulation/Stress intensity factor分类
交通工程引用本文复制引用
肖林发,林恒,王永祥,陈华鹏..Q960D高性能钢疲劳裂纹扩展影响因素分析[J].材料科学与工程学报,2024,42(3):394-404,11.基金项目
国家重点研发计划资助项目(2022YFB2602200) （2022YFB2602200）
国家自然科学基金青年科学基金资助项目(52208168) （52208168）
江西省自然科学基金资助项目(20232BAB214079) （20232BAB214079）
