摘要
以某型动车组广泛使用的ER8C车轮为例,采用车轮辐板光滑试样测试常温以及-20℃,-40℃低温下车轮材料的疲劳极限,并定量分析尺寸系数和表面加工系数对车轮疲劳性能的影响。其中,在计算尺寸系数时基于车轮辐板厚度方向与其光滑试样径向受力状态相似的特点,取车轮疲劳强度最薄弱部位的辐板厚度为截面特征尺寸;在计算表面加工系数时基于Frost裂纹试样疲劳极限理论,不考虑表层应力状态对车轮疲劳性能的影响,仅考虑表面加工粗糙度对疲劳性能的影响。在此基础上,可估算出99%可靠度以及常温、低温条件下动车组车轮的疲劳极限。考虑到车轮钢与风电塔筒、轮毂等都属于碳素钢材料体系,借鉴风电行业广泛使用的结构寿命评估国际标准,可得到动车组车轮的应力—寿命曲线。
Taking ER8C wheels widely used for some types of EMUs for examples,the fatigue limits of wheel materials under normal temperature,-20 and-40℃were tested by using smooth specimens of wheel webs.The influence of size factor and surface machining factor on the fatigue performance of wheel was quantitatively analyzed.In calculating the size factor,based on the characteristics that the thickness direction of wheel web was similar to the radial stress state of smooth specimen,the web thickness of the weakest part of wheel fatigue strength was taken as the characteristic size of the cross section.In calculating the surface machining factor,based on the Frost s fatigue limits theory of crack specimen,the effect of surface stress state on the fatigue performance of wheel was not considered,but only the effect of surface roughness on the fatigue performance was considered.On this basis,the fatigue limits of EMU wheels with 99%reliability under normal and low temperature conditions could be estimated.Considering that wheel steel and wind power tower and wheel hub all belonged to carbon steel material system,the stress-life curve of EMU wheel could be obtained by referring to the international standard of structural life assessment widely used in wind power industry.
作者
张澎湃
张关震
赵方伟
吴斯
高俊莉
尹鸿翔
丛韬
ZHANG Pengpai;ZHANG Guanzhen;ZHAO Fangwei;WU Si;GAO Junli;YIN Hongxiang;CONG Tao(Metals & Chemistry Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing100081,China;Standards & Metrology Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing100081,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2019年第3期97-102,共6页
China Railway Science
基金
国家重点基础研究发展计划项目(2015CB654805)
国家重点研发计划项目(2017YFB0702004)
