计入丝间非线性接触的单股钢丝绳疲劳特性研究

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摘要为探究单股钢丝绳在周期拉伸交变载荷作用下的疲劳特性演变规律与失效机理，本研究首先建立了计入丝间非线性接触等因素的单股钢丝绳疲劳特性有限元分析模型，其次提出了单股钢丝绳内部空间螺旋接触区域高精度网格划分方法和单股钢丝绳端面约束方案，从而解决了钢丝绳仿真中普遍存在的终端效应问题，最后分析了单股钢丝绳疲劳特性以及几何参数、材料参数等对其疲劳特性的影响。结果表明：周期拉伸交变载荷作用下，单股钢丝绳芯丝-侧丝接触线区域发生了明显的应力集中，该区域因较大的应力幅而最易发生疲劳寿命衰减甚至破坏；芯丝疲劳寿命敏感区呈空间螺旋带状分布，并与芯丝-侧丝接触区域对应；对于始终处于芯丝-侧丝接触状态的单股钢丝绳，适当减小侧丝直径和捻角、选用弹性模量较小且泊松比较大的材料利于提高单股钢丝绳的疲劳寿命。

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	陈原培
	张余

关键词 ：单股钢丝绳, 疲劳寿命, 非线性接触, 有限元分析

Abstract：In order to explore the evolution law and failure mechanism of the fatigue property of a single-strand wire rope subjected to a cyclic tensile alternating load, the present study established a finite element analysis model for fatigue performance of the rope with the consideration of the nonlinear interwire contact. A high-precision meshing method and an end-effect restriction scheme were respectively proposed to realize the local mesh refinement along the spiral interwire contact area within the rope, and to solve the common end-effect problem in the rope simulations. Then, the fatigue characteristics of the rope were analyzed, and the influences of the geometrical and material parameters on the rope’s fatigue performance were discussed. The results show that obvious stress concentrations occur in the contact regions between the core and outer wires of the rope subjected to a cyclic tension alternating load, and the local fatigue life shortening, or even damage, is most likely to happen in this area due to the high stress amplitude. The fatigue life sensitive area of the core wire composes of several spatial spiral strip individual ones, which correspond to the contact regions between core and outer wires. With regard to a single-strand wire rope that only exists the contact between the core and outer wires, an appropriate decrement in the outer wire diameter or lay angle can improve the fatigue life of the single-strand wire rope, as well as the selection of a material with a smaller elastic modulus and larger Poisson's ratio.

Key words： single-strand wire rope fatigue life nonlinear contact finite element analysis

收稿日期: 2020-10-09 出版日期: 2021-11-28

引用本文:

陈原培，张余. 计入丝间非线性接触的单股钢丝绳疲劳特性研究[J]. 振动与冲击, 2021, 40(22): 112-120.
CHEN Yuanpei，ZHANG Yu. Fatigue performance of a single-strand wire rope with nonlinear interwire contact. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(22): 112-120.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I22/112

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