中国铁道科学2023，Vol.44Issue(6)：57-66,10.DOI:10.3969/j.issn.1001-4632.2023.06.06
重载铁路用钢轨夹杂物临界尺寸研究
Research on the Critical Size of Rail Inclusions for Heavy-Haul Railways
摘要
Abstract
The increase of train axle load puts forward higher requirements for rail cleanliness.In order to explore the influence laws on inclusions of rail service life,a finite element model of rails was established to analyze the influences of the inclusions'shape,depth and size on rail stress.The influence of inclusions on the fatigue life of rails was also analyzed by FE-SAFE fatigue simulation software and the"radius-length"curve of the rail fatigue damage caused by inclusions was calculated.The results show that smaller inclusions tended to cause local stress concentration in the rail;the larger the distance between the inclusions and the rail tread,the smaller the maximum equivalent stress of the rail;the larger the loaded area of inclusions,the more obvious the influence on rail stress;the inscribed radius of inclusions had more influence on the stress state of the rail.For 25 t axle load,the fatigue life of the rail was inversely proportional to the cube of the inscribed radius of the inclusion,and was inversely proportional to the square of the length of the inclusion.The inscribed radius of the inclusion had more influence on rail fatigue life than its length;the"radius-length"combination of the critical sizes of Al2O3 inclusions at 5 mm under the rail tread were"20 μm-1 620 μm","60 μm-395 μm"and"100 μm-207 μm".Thus,emphasis should be placed on the oversize large inclusions in rail inspection.关键词
钢轨夹杂物/尺寸因素/疲劳寿命/临界尺寸Key words
Rail inclusions/Factor regarding size/Fatigue life/Critical Size分类
交通工程引用本文复制引用
石彤,彭启钰,刘丰收,陈朝阳,俞喆,张骞..重载铁路用钢轨夹杂物临界尺寸研究[J].中国铁道科学,2023,44(6):57-66,10.基金项目
国家重点研发计划项目(2021YFB2601000) （2021YFB2601000）
山东省自然科学基金资助项目(ZR2019PEE011) （ZR2019PEE011）
中国铁道科学研究院集团有限公司院基金课题(2020YJ068) （2020YJ068）
中国铁道科学研究院集团有限公司金属及化学研究所基金课题(2020SJ03) （2020SJ03）
