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ID:36602780
大小:7.90 MB
页数:94页
时间:2019-05-12
《弯矩作用下钢轨疲劳试验研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、西南交通大学硕士学位论文弯矩作用下钢轨疲劳试验研究姓名:胡家杰申请学位级别:硕士专业:机械设计及理论指导教师:刘启跃20081201AbstractWiththedevelopingofnationaleconomyandthebeginningoftheEleVenthFive.vearPIan,railwaytransportation,especiallyhighspeedrailwayconstnlctlon’lsmOreandmoreimportant.Comparedwithdevelopedcountries,ourcountry。stechnoI
2、ogyofhigh.speedrailwayisnotperfect.SomeunknownprobIemshaVebeendiscoveredinthequasihighspeedrailway,especiallyrollingcontactfatigue·Forexample,ObliqueCrackofPD3andU71Mnrailhavebeendiscovered1nGuangzhou.Shenzhenrailway.SoitisveryimportantforthedeVelopmentofourcountry,shigh.speedrailway
3、toanalysisandresearchthecrack’sinitiationandgrowth.Thenewtestrighasbeensuccessfullydevelopedbymodifyingtheclampsandthecontr01programsfromthefrettingapparatuswithhighprecision·Throughchangingofexperimentalparameters,suchasloadamplitude,loadingrate.whicheffect0nfatigueproperties,thispa
4、perresearchedfatiguepropertiesofsteeIrall.Experimentalresultshavebeenanalyzedindetailbymeansofopt童caImlcroscopyfoM),hardnesstester,andscanningelectronmicroscopy(SEM)·MainconcIuslonsaredrawnasfollows:1、Anewexperimentalapparatushasbeendevelopedto。eallysimulateinstaUationf0哪ofrailway.Th
5、eexperimentalrealizedthenormalload,layinganexperimentaIfoundationtoresearchinginfluenceofmomentofflexure·Testscanbedone0nmodeofimposedload.TheloadingrateandloadingamplitudecanbecontrolledbVthesystemcomputer.Resultsshowedabettercompa。ablecharacteristicsandrepeatability.2、Morph0109yOfc
6、rackunderstaticloadwasgreatdifferentthanwhichunderdynamicload.Crackpropagationpathunderstaticloadappearedsuddenchange·Atthesametjme,thegrowthofcrackunderdynamicloadwasmorestablethanthatunderstaticload.西南交通大学硕士研究生学位论文第‘IIl页3、Loadingratehasdifferentinfluenceonthedifferentmaterials.PD3r
7、ailismoresensitivetoloadingratethanU71Mnrail.Undersameloadingamplitudeanddifferentloadingrate,growthofcrackofPD3railwasdifferentformU71Mnrail.4、PD3rail’SfatiguepropertieswasdifferentfromU71Mnrail’S.Underlowcycle,crackhasbeendiscoveredinPD3rail,buttherewasnocrackdiscoveredinU71Mnrail.
8、Theresultssh
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