基于FS准则的钢绞线索微动疲劳分析和寿命预测  

Fretting fatigue analysis and life prediction of steel strand cable based on FS criterion

作　　者：王先 王春江[1] WANG Xian;WANG Chun-jiang(School of Naval Architecture,Ocean&Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《空间结构》2023年第4期28-34,48,共8页Spatial Structures

摘　　要：钢绞线索在大跨空间结构中应用广泛,而微动疲劳是导致钢绞线索失效的主要原因之一.与平行钢丝束索相比,钢绞线索的丝间作用力更大,微动疲劳破坏也更严重.针对钢绞线索的疲劳失效问题,建立了交错捻制的钢绞线索的精细有限元模型,通过子模型技术对层间钢丝接触部分的应力、应变进行精确的计算;基于FS多轴疲劳寿命预测准则建立了钢绞线索的疲劳寿命数值仿真分析方法,通过对比不同材料疲劳参数估计方法预测了钢绞线索疲劳寿命,并进行了试验验证.结果表明,FS准则能有效反映钢绞线索内钢丝之间微动斑的分布规律和疲劳破坏的位置,也能有效反映钢丝微动破坏的平面.通过有限元数值仿真和多轴疲劳寿命计算得到的疲劳寿命与试验结果的误差为8.08%~60.08%,具有一定的工程应用前景.The fretting fatigue is one of the main reasons for the failure of steel strand cables,which are widely used in large-span spatial structures.Compared with parallel wire strand,the interwire forces of strand cables are larger and fretting fatigue damage is more serious.Aiming at the fatigue failure of steel strand cable,the finite element model of steel strand cable was established,and the stress and strain of steel wire contact between layers was accurately calculated by using the sub-model technology.The numerical simulation analysis method for fatigue life of steel strand was established based on FS multiaxial fatigue life prediction criterion.The fatigue life of steel strand cable is predicted by comparing different fatigue parameter estimation methods and verified by experiments.The results show that the FS model can effectively reflect the distribution law of wear fretting spots and the location of fatigue failure,as well as the plane of fretting failure of steel wire.The error between fatigue life calculated by FEM numerical simulation and multiaxial fatigue life and test life is 8.08%~60.08%,which shows that the model has high serviceability for engineering application.

关 键 词：钢绞线索 微动疲劳 FS准则 疲劳寿命 有限元模型 

分 类 号：TU351[建筑科学—结构工程]