华中科技大学学报（自然科学版）2024，Vol.52Issue(12)：70-76,7.DOI:10.13245/j.hust.241208
一种考虑平均应力影响的疲劳寿命预测方法
A fatigue life prediction method considering influence of mean stress
摘要
Abstract
The American Society of Mechanical Engineers(ASME)-based equivalent strain model corrected by fatigue life reduction factor and non-proportionality factor was improved further by combining the Smith-Watson-Topper(SWT)mean stress correction method,a multi-axis fatigue life prediction model that takes into account the influence of mean stress was constructed.In this new developed model,a weight factor was introduced to reflect the different influence of tensile mean stress and compressive mean stress on fatigue life.The predictability of the proposed model was validated by using 256 fatigue datasets of 7075-T651 aluminum alloy,Ti-4A1-6V titanium alloy,and S460N steel that are tested under 18 kinds of loading paths(including 11 symmetric cyclic loadings and 7 asymmetric cyclic loadings).Results show that the proposed model has satisfactory prediction accuracy regardless of whether there is non-zero mean stress in the loading paths,and most of the data points fall within factor-of-three boundary.关键词
多轴疲劳/平均应力/寿命预测/权重系数/非对称循环加载Key words
multiaxial fatigue/mean stress/life prediction/weight factor/asymmetrical cyclic loading分类
数理科学引用本文复制引用
李静,刘豪,华腾飞,仇原鹰..一种考虑平均应力影响的疲劳寿命预测方法[J].华中科技大学学报（自然科学版）,2024,52(12):70-76,7.基金项目
陕西省自然科学基础研究计划资助项目(2023-JC-YB-328) （2023-JC-YB-328）
中央高校基本科研业务费专项资金资助项目(ZYTS23014). （ZYTS23014）
