微动频率对钢丝拉扭复合微动腐蚀疲劳行为影响研究

拉扭复合微动腐蚀疲劳是深井提升钢丝绳主要失效形式之一，深井提升钢丝绳振动频率决定钢丝间微动频率，直接影响钢丝拉扭复合微动腐蚀疲劳机理和损伤程度，进而制约深井提升钢丝绳服役安全性. 本文作者通过自制钢丝拉扭复合微动腐蚀疲劳试验机开展了酸性电解质溶液中钢丝拉扭复合微动腐蚀疲劳试验，通过钢丝切向力-位移幅值和扭矩-扭转角滞后回线分析了拉扭复合微动腐蚀疲劳过程中钢丝间接触状态及轴向和扭转方向钢丝耗散能，运用扫描电子显微镜和三维白光干涉表面形貌仪考察了拉扭复合微动腐蚀疲劳过程中钢丝磨痕形貌和磨损深度轮廓特性，采用X射线三维成像系统揭示了钢丝拉扭复合微动腐蚀疲劳裂纹扩展演化规律，通过电化学分析仪分析试验后钢丝Tafel极化曲线和阻抗谱以探究钢丝电化学腐蚀倾向和耐腐蚀性，揭示了微动频率对拉扭复合微动腐蚀疲劳过程中钢丝间接触状态、钢丝耗散能、微动磨损机理、疲劳裂纹扩展演化和疲劳寿命、电化学腐蚀倾向和耐腐蚀性的影响规律. 结果表明：在拉扭复合微动腐蚀疲劳过程中，随着微动频率的增加，钢丝间由完全滑移和部分滑移混合状态变为完全滑移状态，钢丝扭矩-扭转角滞后现象削弱，钢丝切向力-位移幅值和扭矩-扭转角滞后回线对应的耗散能均总体降低，钢丝间摩擦系数和钢丝磨损深度均降低，钢丝磨损机理均为磨粒磨损、黏着磨损、疲劳磨损和腐蚀磨损，钢丝最大裂纹深度和裂纹扩展速率均降低，疲劳寿命增加，钢丝电化学腐蚀倾向下降和耐腐蚀性增强.

Torsional-tensile combined fretting corrosion fatigue is one of the main failure modes of deep mine hoisting steel wire ropes. The vibration frequency of deep mine hoisting steel wire ropes determines the fretting frequency between wires, which directly affects the fretting corrosion fatigue mechanism and damage degree of wires under torsional-tensile combined loading conditions, and further restricts the service safety of deep mine hoisting steel wire ropes. In this study, the authors carried out torsional-tensile combined fretting corrosion fatigue tests on steel wires in acidic electrolyte solution using a self-made dedicated testing machine. The contact state between adjacent wires and the dissipated energy of wires in both axial and torsional directions during the fretting corrosion fatigue process were analyzed based on the tangential force-displacement amplitude curves and torque-twist angle hysteresis loops. The wear scar morphology and wear depth profile characteristics of the tested wires were characterized using a scanning electron microscope (SEM) and a 3D white-light interferometric surface profilometer. The evolution law of fatigue crack propagation of steel wires during torsional-tensile combined fretting corrosion fatigue was revealed via an X-ray 3D imaging system. The Tafel polarization curves and electrochemical impedance spectroscopy (EIS) of the post-test wires were analyzed using an electrochemical analyzer to investigate the electrochemical corrosion tendency and corrosion resistance of the steel wires. The influence rules of fretting frequency on various aspects including the contact state between wires, dissipated energy of wires, fretting wear mechanisms, fatigue crack propagation evolution, fatigue life, electrochemical corrosion tendency and corrosion resistance during the torsional-tensile combined fretting corrosion fatigue process were systematically clarified. The results demonstrate that: during the torsional-tensile combined fretting corrosion fatigue process, as the fretting frequency increases, the mixed state of complete slip and partial slip between wires transforms into a complete slip state; the torque-twist angle hysteresis effect of wires is weakened; the dissipated energies corresponding to the tangential force-displacement amplitude and torque-twist angle hysteresis loops both generally decrease; both the friction coefficient between wires and the wear depth of wires are reduced; the wear mechanisms of the wires are abrasive wear, adhesive wear, fatigue wear and corrosive wear; the maximum crack depth and crack growth rate of the wires both decrease, while the fatigue life is prolonged; the electrochemical corrosion tendency of the wires declines and the corrosion resistance is enhanced.

搜集汇总

背景与挑战

背景概述

该数据集研究了微动频率对钢丝拉扭复合微动腐蚀疲劳行为的影响，聚焦于深井提升钢丝绳的失效分析。通过实验揭示了随着微动频率增加，钢丝间接触状态从混合滑移变为完全滑移，导致耗散能、磨损深度和裂纹扩展速率降低，同时疲劳寿命延长和电化学腐蚀倾向减弱。数据集包含实验数据，旨在分析微动磨损机理和疲劳裂纹扩展规律，为摩擦学领域提供关键参考。