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<p>With the rapid development of automated production, cables are increasingly used in workshop environments. To investigate the service life of drag chain cables under frequent reciprocating operating conditions, this paper proposes a theoretical model for cable fatigue life based on S–N life curve theory, referred to as the modified stress number (MSN) of cycles theoretical model, abbreviated as the MSN model, and the proposed method is validated through experimental tests. A 100-mm-long single-core, multi-strand twisted three-dimensional copper cable model, consisting of 37 copper wires, was selected as the research object. The fatigue life of the cable was analyzed through finite element simulation based on a coupled simulation platform integrating ANSYS Workbench and nCode. Meanwhile, an experimental test platform was established to obtain the actual fatigue life cycles of the cable. By comparing the simulation results with the experimental data, the feasibility of the MSN model was further validated. The study provides a valuable reference for the development and optimization of cables used in robotic arms.</p>

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Fatigue Life Prediction of Drag Chain Cables Based on a Novel Modified S–N Life Model

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Quanfeng Li,
  • Dezheng Ma,
  • Jiaqi Li

摘要

With the rapid development of automated production, cables are increasingly used in workshop environments. To investigate the service life of drag chain cables under frequent reciprocating operating conditions, this paper proposes a theoretical model for cable fatigue life based on S–N life curve theory, referred to as the modified stress number (MSN) of cycles theoretical model, abbreviated as the MSN model, and the proposed method is validated through experimental tests. A 100-mm-long single-core, multi-strand twisted three-dimensional copper cable model, consisting of 37 copper wires, was selected as the research object. The fatigue life of the cable was analyzed through finite element simulation based on a coupled simulation platform integrating ANSYS Workbench and nCode. Meanwhile, an experimental test platform was established to obtain the actual fatigue life cycles of the cable. By comparing the simulation results with the experimental data, the feasibility of the MSN model was further validated. The study provides a valuable reference for the development and optimization of cables used in robotic arms.