重庆大学学报2026，Vol.49Issue(8)：42-52,11.DOI:10.11835/j.issn.1000-582X.2024.289
M24高强度螺栓低周疲劳寿命分析及预测
Low-cycle fatigue life analysis and prediction of M24 high-strength bolts
摘要
Abstract
To investigate the low-cycle fatigue damage characteristics and life patterns of high-strength bolts used in assembled steel structures,constant-amplitude axial tension low-cycle fatigue tests were conducted on fifteen M24 Grade 10.9 high-strength bolts using a self-designed loading apparatus.The fatigue failure characteristics of typical bolt specimens under different displacement amplitudes were analyzed,and combined with life prediction models,the applicability of the power-law function and the Coffin-Manson formula for predicting the low-cycle fatigue life of high-strength bolts was evaluated.The results show that increasing displacement amplitude intensifies stress concentration in the bolts,resulting in rougher fracture surfaces,a reduced fatigue crack propagation region,and an enlarged instantaneous fracture area.Fatigue failure mainly occurs at the first engaged thread between the bolt and nut.No significant monotonic relationship is observed between low-cycle fatigue life and cyclic displacement amplitude,as similar fatigue lives may occur under different displacement levels.When the displacement amplitude approaches the ultimate load-bearing capacity,the failure mode gradually resembles static tensile failure.Furthermore,the power-law function formula provides more accurate fatigue life predictions than the Coffin-Manson formula,especially when δ/δy is less than 2.45.关键词
高强度螺栓/疲劳破坏/低周疲劳/轴心受拉/寿命预测Key words
high-strength bolts/fatigue damage/low-cycle fatigue/axial tension/life prediction分类
建筑与水利引用本文复制引用
焦晋峰,施宇晨,夏文渊,陈鹏程,路国运..M24高强度螺栓低周疲劳寿命分析及预测[J].重庆大学学报,2026,49(8):42-52,11.基金项目
国家自然科学基金项目(12172244) （12172244）
山西省省筹资金资助回国留学人员科研项目(2023-175) （2023-175）
山西省基础研究计划资助项目(202203021211184) （202203021211184）
山西省自然科技研究基金(202103021223105) （202103021223105）
吕梁市高层次科技人才引进计划专项项目(2023RC15).Supported by National Natural Science Foundation of China(12172244),Shanxi Province Provincial Funding for Scientific Research Projects of Returned Scholars(2023-175),Shanxi Provincial Fundamental Research Programme Funding Project(202203021211184),Shanxi Provincial Natural Science and Technology Research Fund(202103021223105),and Lvliang Municipal High-level Science and Technology Talents Introduction Programme Special Project(2023RC15). （2023RC15）
