钢芯铝绞线弯曲状态受力分析

Stress Analysis of Bended State Aluminum Cable Steel Reinforced Conductor

根据钢芯铝绞线结构、材料和捻制特点,利用弯曲状态下的一次螺旋线方程,建立钢芯铝绞线弯曲状态下的有限元实体模型,采用Augmented Lagrange算法和Gauss points接触检测法分析导线在弯曲状态下受到张力作用的应力及变形规律.结果表明,在张力作用下等效应力和剪切应力沿截面中心呈上下不均匀分布;弯曲曲率半径对钢芯铝绞线股线受力有影响,曲率半径越大的股线其应力和变形越大;弯曲钢芯铝绞线最大等效应力位于钢芯,最大剪切应力位于外层铝股线,外层铝股线在弯曲状态下首先发生弯曲疲劳磨损的可能性较大.

According to the structure, material and twist characteristics of aluminum cable steel reinforced conductor, and using a helical linear equation, the conductor finite element model of bended state is estab lished. Using Augmented I.agrange algorithm and Gauss points contact detection method, the stress and de formation of the conductor under bended condition can be analyzed. The results show that the equivalent stress and shear stress along the center of the cross section are inhomogeneous distribution under tension; and the conductor stress and deformation are positive correlated with the curvature radium strand. The maximum equivalent stress and shear stress of conductor are located in the steel core and outer aluminum strand; the possibility of bending fatigue wear first occurs in the bending state of the outer aluminum strands.