斜拉索平行钢丝多蚀坑应力强度因子研究

Research of the Effect of Erosion Pits on the stress Intensity Factor of Cable Wire

为研究斜拉索高强钢丝受点蚀影响下的疲劳性能,基于线弹性断裂力学建立了点蚀钢丝有限元模型,对多点蚀坑影响下的高强钢丝表面裂纹应力强度因子进行了计算分析,综合考虑了蚀坑深径比α,以及蚀坑间距d的影响,并进行了参数分析。研究表明:单蚀坑情况下,当增大裂纹本身所处的蚀坑深径比α时,应力强度因子在各蚀坑深度下都呈现出增长趋势;双蚀坑时,当增大与纵向相邻蚀坑的间距d和其深径比α时,应力强度因子先呈现变大趋势后逐渐趋于稳定;多蚀坑情况下,纵向相邻蚀坑对应力强度因子影响最大,此后随着蚀坑数量的持续增加,蚀坑数量对应力强度因子的干扰逐渐降低,研究内容可以为缆索承重桥梁的高强钢丝疲劳性能研究提供参考。

For the study of high strength steel wire cable fatigue performance,under the influence of pitting was established based on the linear elastic fracture mechanics finite element model a little bit of corrosion steel wire,the more the corrosion pit under the influence of high strength steel wire surface crack stress intensity factor was calculated analysis,considering the corrosion pit depth to diameter ratio of α and the influence of the corrosion pit spacing d,and parameters are analyzed.The results show that the stress intensity factor increases at each pit depth when the pitting depth ratioαof the crack itself increases.In the case of double pitting,when the distance d and depth to diameter ratioαof adjacent pitting were increased,the stress intensity factor first increased and then gradually stabilized.In the case of multiple pits,the longitudinal adjacent pits have the greatest influence on the stress intensity factor,and then with the continuous increase of the number of pits,the interference of the number of pits on the stress intensity factor gradually decreases.The research content can provide a reference for the fatigue performance study of high-strength steel wires of cable bearing bridges.