应力比对高强钢丝疲劳寿命影响试验研究  

Experimental Study on Influence of Stress Ratio on Fatigue Life of High Strength Steel Wire

作　　者：曾懿 颜东煌 许红胜 杨盈 ZENG Yi;YAN Donghuang;XU Hongsheng;YANG Ying(School of Civil Engineering,Changsha University of Science&Technology,Changsha,Hunan 410114,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《中外公路》2024年第5期166-172,共7页Journal of China & Foreign Highway

基　　金：国家自然科学基金资助项目(编号:51878073,52278141)。

摘　　要：为明确应力比对钢丝疲劳寿命的影响,验证断裂力学模型对钢丝疲劳寿命评估的适用性。在将钢丝点蚀坑等效为缺口的假设基础上,开展了不同应力比下不同预制深度缺口钢丝样本的疲劳试验,建立了考虑应力比效应的疲劳寿命经验方程。试验结果表明:钢丝样本的疲劳寿命受应力比的影响明显,随应力比的增大而明显减小。预制缺口深度和应力比的增大均会导致钢丝样本疲劳强度的下降。采用考虑应力比效应的断裂力学模型对钢丝样本进行了疲劳寿命预测,预测结果处于±2倍误差带内。断裂力学模型对于不同应力比下的缺口钢丝疲劳寿命预测具有一定的适用性。To clarify the influence of stress ratio on the fatigue life of high strength steel wire and verify the applicability of the fracture mechanics model to evaluate the fatigue life of steel wire,based on the assumption of equating wire corrosion pits to notches,fatigue tests were carried out on steel wire samples with different prefabricated notch depths at different stress ratios,and a fatigue life empirical equation considering the stress ratio effect was established.The results show that the fatigue life of the steel wire samples is significantly influenced by the stress ratio,which decreases with the increase in the stress ratio.The increase in both prefabricated notch depth and stress ratio will lead to a decrease in the fatigue strength of the steel wire samples.The fatigue life of the steel wire samples is predicted by the fracture mechanics model considering the stress ratio effect,and the predicted values are within the error band of±2.0 times.The fracture mechanics model has certain applicability for predicting the fatigue life of notched steel wires at different stress ratios.

关 键 词：高强钢丝 疲劳试验 应力比 预制缺口 疲劳寿命 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]