摘要
客货运轨道交通车辆经长时间运行后会发生局部锈蚀甚至锈穿的现象,给车体结构服役带来巨大的安全隐患。为了研究腐蚀深度对车体结构疲劳强度的影响,从现车截取不同腐蚀深度的试样进行疲劳试验,获得疲劳极限,借助车体强度仿真计算和High-Goodman疲劳极限图开展耐候钢腐蚀深度与疲劳关系研究。结果表明:车体腐蚀部位的失效模式为均匀腐蚀+局部点蚀,不同腐蚀深度试样的中值疲劳极限应力相差不大,约为未腐蚀状态下试样中值疲劳极限应力的65%,疲劳失效均起源于点蚀坑;当试样腐蚀深度达到30%时触发High-Goodman的安全疲劳边界,腐蚀深度超过50%时将触发疲劳仿真计算边界,给车体结构服役安全带来疲劳失效危害。
After long-term working,passenger and freight rail transit vehicles may suffer localized corrosion or even rust wear,posing a huge threat to the structure service safety.In order to study the influence of corrosion depth on the fatigue strength of vehicle body structures,fatigue tests were conducted on the specimens with different corrosion depths from existing vehicles to obtain the fatigue limits.The relationship between corrosion depth and fatigue limit was studied based on simulation calculation and High-Goodman fatigue limit diagram.The results show that the failure mode of corrosion parts is uniform corrosion and local pitting.The median fatigue limit stresses of specimens with different corrosion depth show no obvious differences,which is about 65%of the median fatigue limit stress of specimens without corrosion.The fatigue failures of corrosion specimens all originate from pitting.The safety fatigue boundary of High-Goodman may be triggered when the corrosion depth of specimensreaches 30%.While,the simulation calculation boundary may be triggered when the corrosion depth exceeds 50%,leading to fatigue failure hazards to the service safety of vehicle structure.
作者
梁景恒
王兆勋
董园园
陈俊宏
张子博
张涛
LIANG Jing-heng;WANG Zhao-xun;DONG Yuan-yuan;CHEN Jun-hong;ZHANG Zi-bo;ZHANG Tao(No.52 Institute of China North Industries Group Yantai Branch Co.,Ltd.,Shangdong Yantai 264003,China;Yantai Tiezhongbao Steel Processing Co.,Ltd.,Shandong Yantai 264006,China)
出处
《失效分析与预防》
2023年第5期320-325,共6页
Failure Analysis and Prevention
作者简介
梁景恒(1986年−),男,高级工程师,主要从事金属及非金属材料表征测试分析等方面的研究。
