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时间:2020-04-21
《电气化铁路输电导线线股接触区磨损特性-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第l3卷第5期交通运输3-程学报Vo1.13No.52013年10月JournalofTrafficandTransportationEngineeringOct.2013文章编号:1671l637(20l3)050121—06电气化铁路输电导线线股接触区磨损特性赵美云,刘正林,赵新泽,高伟。,汪启峰(1.武汉理工大学能源与动力工程学院,湖北武汉430070;2.三峡大学机械与材料学院,湖北宜昌443002;3.中国水电顾问集团贵阳勘测设计研究院,贵州贵阳550081)摘要:以LGJ15o/25型钢芯铝绞线为试验导线,在自制试验装置上模拟了在干燥和酸性条件下导线的微风振动,采用扫描电子
2、显微镜和能谱仪观察试验导线磨痕微观形貌与成分,建立了相同工况下内外层线股接触区有限元模型,分析有限元模型的计算结果与磨痕形貌。分析结果表明:2种条件下内层铝线股接触区的磨痕形状与应力分布均为椭圆形,其长轴与线轴中心呈一定夹角;铝线股接触区磨损特性与接触应力分布相关,接触区中心区接触应力明显高于其他区域,高应力使表面产生塑性变形与大量磨损微粒;磨损边缘区发生了弹性变形,受中心区特别是过渡区突变应力挤压作用,产生了表层组织的塑性流动和堆积现象;在中心区与边缘区的过渡区域存在应力集中,法向压应力和剪应力发生突变,滋生了疲劳裂纹。关键词:电气化铁路;钢芯铝绞线;磨损特性;有限元;表面形貌;接触
3、应力中图分类号:TH117文献标志码:AWearcharacteristicsofcontactareaamongtransmissionconductorstrandsofelectrifiedrailwayZHAOMei—yun,LIUZheng—lin,ZHAoXin—ze。,GAOWei。,WANGQi—feng(1.SchoolofEnergyandPowerEngineering,WuhanUniversityofTechnology,Wuhan430070,Hubei,China;2.SchoolofMechanicalandMaterialEngineering,Chi
4、naThreeGorgesUniversity,Yichang443002,Hubei,China;3.HydroChinaGuiyangEngineeringCorporation,Guiyang550081,Guizhou,China)Abstract:TakingLOJ150/25aluminumcablesteelreinforced(ACSR)wireastestedwire,aeolianvibrationsunderdryandacidicconditionsweresimulatedonaself—madetestrig.Thesurfacemorphologyofwe
5、arscaroftestedwireanditselementswereobservedbyusingscanningelectronmicroscope(SEM)andenergydispersivespectrometry(EDS).Afinitemodelofinsideandoutsidewirecontactareaswasbuiltunderthesameconditions.Theanalysisresultsofthefinitemodelandthesurfacemorphologyofwearscarwerecompared.Comparisonresultindi
6、catesthatboththewearscarshapesandthestressdistributionsofcontactareaamonginneraluminumstrandsareoval—shapedundertwoconditions.Oval—shapedmajoraxisandstrandaxishaveacertainangle.Thecontactstressinthecentralcontactareaissignificantlyhigherthanotherareas.Theplasticdeformationandalargenumberofwearde
7、brisoccuronthesurfaceofwearareabecauseofhighstress.Thecompressionofmutatedstressfromthecenterarea,especialtransitionarea,causestheelasticdeformationattheedgeofwearareaandthephenomenaofplasticflowandstackingofsurfacetissue.Th
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