拉伸载荷下钢芯铝绞线的力学特性仿真分析

Simulation analysis on mechanical properties of aluminium cable steel reinforced under tensile load

为了研究钢芯铝绞线(ACSR)结构参数对其在拉伸载荷下力学特性的影响,基于ANSYS参数化设计语言(APDL)建立了ACSR参数化有限元模型。以TACSR/AS-410/70 ACSR为研究对象,基于数值仿真结果研究了该导线股丝应力分布和分层应力应变随拉伸载荷的变化规律,通过拉伸实验验证了有限元模型的准确性;并基于上述模型数值模拟了不同节径比和铝钢比下绞线在拉伸载荷下的力学响应。数值仿真结果表明,随铝钢比增加,ACSR不同层间最大等效应力随载荷增加而增加的趋势变小,绞线的最大应力值较低,股丝间应力分布更平均;而ACSR节径比越小,绞制越紧密,其不同层股丝应力也越大。研究结果可为ACSR的结构设计、线夹选型及优化设计等提供重要依据。

In order to study the influence of structural parameters of aluminium cable steel reinforced(ACSR) on its mechanical property under tensile load, a parametric finite element model of ACSR was established based on the ANSYS parametric design language(APDL). First, the stress distribution of TACSR/AS-410/70 and the variation law of its layered stress and strain with tensile loads were simulated and studied. And then the finite element model of TACSR/AS-410/70 was verified by the tensile experiment. Furthermore, the parametric finite element model was used to simulate the mechanical response of cables with different lay ratio or aluminum-steel ratio. It can be concluded from the simulation results that as aluminum-steel ratio increases, maximum equivalent stress between different layers of the ACSR increases more slowly with the increase of load, the maximum stress of the strand is lower, and the stress distribution between strands is more even. However, as the lay ratio of ACSR is smaller, the strand is tighter and stress of strands in different layers is larger. The experimental results provide significant implications for the design of ACSR’s structure and the selection and optimization design of cable clamp.