考虑微动磨损的钢丝微动疲劳裂纹扩展寿命预测研究

微动疲劳是矿井提升钢丝绳主要失效形式之一，在钢丝微动疲劳过程中，微动磨损严重影响钢丝微动疲劳裂纹扩展特性，进而制约钢丝微动疲劳断裂机制，故开展考虑微动磨损的钢丝微动疲劳裂纹扩展寿命预测研究至关重要. 运用自制钢丝微动疲劳试验机开展钢丝微动疲劳试验和拉伸断裂试验，通过高速度数码显微系统揭示微动疲劳过程中钢丝微动磨损演化、裂纹萌生和扩展及断裂特性，基于摩擦学和断裂力学理论，运用有限元法、循环迭代法和虚拟裂纹闭合技术建立了考虑微动磨损的钢丝微动疲劳裂纹扩展寿命预测模型，并进行试验验证. 结果表明：采用微动疲劳过程稳定阶段磨损系数预测钢丝微动磨损演化可保证预测正确性，微动疲劳过程中钢丝主要为I型裂纹扩展模式，考虑微动磨损的钢丝微动疲劳裂纹扩展寿命预测值和试验值吻合较好，验证了预测模型正确性.

Fretting fatigue is one of the main failure modes of mine hoisting steel wire ropes. During the fretting fatigue process of steel wires, fretting wear severely impairs the crack propagation characteristics of fretting fatigue cracks, which further hinders the in-depth clarification of the fracture mechanism governing steel wire fretting fatigue failure. Therefore, it is critically important to conduct research on predicting the fretting fatigue crack propagation life of steel wires while considering fretting wear.
Self-developed steel wire fretting fatigue testing machines were utilized to perform fretting fatigue tests and tensile fracture tests on steel wires. A high-speed digital microscopy system was employed to reveal the evolution of fretting wear, crack initiation and propagation, as well as fracture characteristics of steel wires throughout the fretting fatigue process.
Based on the theories of tribology and fracture mechanics, a prediction model for the fretting fatigue crack propagation life of steel wires considering fretting wear was established by adopting the finite element method (FEM), cyclic iteration method, and virtual crack closure technique (VCCT), and experimental validation was conducted for the model.
The results show that: predicting the evolution of fretting wear in steel wires using the wear coefficient obtained during the stable stage of the fretting fatigue process can ensure the accuracy of the prediction; the primary crack propagation mode of steel wires during fretting fatigue is Mode I cracking; the predicted values of the fretting fatigue crack propagation life of steel wires considering fretting wear are in good agreement with the experimental results, which verifies the correctness of the proposed prediction model.

搜集汇总

背景与挑战

背景概述

该数据集聚焦于钢丝微动疲劳裂纹扩展寿命预测，结合实验和理论模型，特别关注微动磨损的影响。研究通过自制试验机和高速度数码显微系统进行实验，并基于摩擦学和断裂力学理论建立预测模型，验证了模型的准确性。