ANALYSIS+OF+THERMAL-ELASTIC+STRESS+OF+WHEEL-RAIL+IN+ROLLING-SLIDING+CONTACT
CHINESEJOURNALOFMECHANICALENGINEERING
?21?
mechanicala芏1d
thc埘al
stresses,alldme1argemechaIlicals仃ess
onh,exists枷ng
contact,
sotheMisesstresschangesmore
auicklvwithmetimethantlletemperatllre.Cornpared也eresults
oftwocases
wheret11eth锄al
10adistakenintoconsideration
and
not,even
ifthe
materialleavescontactpatch,themechanicals缸弓ssdisappears,merelativelVsmaUs缸℃ssstillexists,namely
themal
s仃ess.In
addition,丘omFigs.3and4,itisfloundmatthe
increasingrates
of
the衔ctionteInperature锄dthetllemal
s仃ess
of
mematerialente—n2mecon协ctareaare舢ch
hi曲ertllanthoseoftllematerialleavingthecontactpatch.TheresultsoftherailaresiIllilartothoseoftllewheel,butc蛐’tgetintoasteady
cVcle
state
likethewhecl,and
soare
notshownagainhere.
525
Longitudinal
coordinate—mm
r小Wheel
Longitudinal
coordinate刊mm
fblRail
Fig.5
Misesstressdismbution
nearwheeI—rail
cOntactpatchat1.72
s
I孟
害
暑
暑
8
墨芑
誊
Longitudinal
coordinate—mm
(a)wheel
Longitudinalcoordinate
J/mm
(b)Rail
Fig.6
Localstressdistribution
ofwhee胁i1
at1.72
s
witllout也a眦al
s仃ess
Fig.7皿e咖al
fatiguedamage
ontllewheel
su血ce
Fig.5showsthelocal
Mises
s仃ess
dis仃jbutionofthewheel/
rail
near
thecontact
patchat1.72s.Fig.6showsMisesstress
2.2
Effectofmlling
speed
on御ctiontempe豫ture
distributionoft11e
s锄e
wheel/rail10cationwheremethemal
and
thermaIstress
s打ess
isneglected
at
1,72
s.
Contrasting
Fig-5toFig.6,it’sfoundthatthecontollrlines
aroundthecomactpatchinFig.5aremorecrowdedmanFig.6.Inanotherword,inmeregionaroundthecoll忉默patch,the酉a-dientsofthestressesands仃ainswithconsideringme倒ctiontemperatIlreeffbctareInuchhi曲ermant110sewi廿lout.The衔c—
tionheatcan擘,eatlyafrectthetemperanlreandstressdistribution
inabout2
mmdepm.Fordeeperarea,the衔ctionheathasavery
smallinnuenceontlles仃essdistribution、]l,hichismainlVcausedby也emechanical10ad.It’sshowninFig.5matevenmou量血thesllrfacematerial1eavestllecontactzone.themennals仃essisstinconsiderableldlletonotsumcientc001in2.
Accordin2totheresultsshowninFigs.3~6,it’sconcludedmatmenuctIlantmernlalloadimDactsmewheelsllrfaceatldsub-surface.ThethennalstressandtemDeratllrerisedueto缸ctionisconsiderableandcan’tbeneglectedonthewheelsurfhceandsubsurface.Thissituationeasilycausestlleme彻alf乱i毋ledam-
ageinthewheelsurface,asshownin
Fig.7.
In
ordcrt0stIldythee虹bctsoftllerollingspeedonme衔c—
tiontenlperatllre髓dthen】1als仃ess,threecaseswitllmer01lingspeedsof25m/s,50m/sand1OOm/sareanalyzed,respectively.Forthecomparabilityofdifferemcase,t11eslidingspeedisan
assumedtobe1In/sinthethreecases.namelv’theheatsourcearemesarIleinthethreecases.Therefore,t11ecreepagesofmethreecasesare,rcspectively'4%,2%and1%forthegivenmreer01ling
speeds.Thevalues
ofotherparameters
listedin1lIble.Fig.8
showsthetemDeral}urehistoriesofmesame、^血eel叫f-acenodeat
threerolling
speeds.ThecoITespondingMisess仃esshistoriesof
mewheels11rfacenodeforthemreerollingspeedsareshownin
F运9.
FromFigs.8a11d9,itcanbefollndthatmehi曲errolling
speed1eadstothelower缸ctiontemperatLIreriseandmesmallersn.ess.AndtherateoftemDeraturechallgewjmmespeedincrease
is10werthanthat
ofMisess订ess.Thatisbecausethesu—hcema—
terialsoft11ewheelandrailpassmrou曲tllecomactpatchforashortertimeatahigherspeed.Therefore,atthes锄esliding
5
0
5
O
5
O
9OO112455
555一一一一一
一一仨粤
I
j
CHINESEJOURNAL0FMECHANICALENGINEERING?23?
Fig.11F1attingonmewheelsurfaceduet0br出e
3CoNCLUSIoNS
Usingtwo.dimensionalfiniteelementrnemod,an、】mericalmethodisputfon)lrardtoanalyzetllecouplingthernlal一mechanical
s仃essofwheel/railinrolling—slidingcontact.Inmenumericalanalvsis,forsimplicity,thecontactmechanicsmodelofthewheel/railisdirectlygjven,namely,Carter’s“vo—dimensionalroUingcontactmodelisusedtodetenninethepressureandtan.2enttractiononthecontactDatchofnlewhee¨ailduetotheaxle10adandmecreepage.ThemenIlal10ad,duetome衔ctionbe.“veenthewheel/railcontactingsurf.aces,isdirectlyandequiva—lentlyappliedtotheelementsnodesinthecontactpatch.Thenon—steadvheat仃ansfbrbetweenmecontactingsurf.acesofthewheel/rail.heat。convectionandradiationbetweenthewheel.railandtheambient
aretaken
intoconsideration.Throughtllenu.
mericalanalysis,thefollowingconclusionscanbedIawn.(1)Duringthewheel/railrolling—sliding。thethemals订essinthethinlayernearthecontactpatch,duetothe矗ictiontem口era.tLlrerise,isconsiderable.Thehigherr011ingspeedleadstothe
●一
一●
lower疗ictiontemDeranlreriseandsmallers仃ess.
(2)Duringthewheelp11reslidingontherail,the丘ictionternDeranlreandthemal—mechanicalstressofthewheel/tailrisequicklyatmeinitialslidingstage,andthengetsintoasteadystateThematerialwearratehasaninfluenceonthecouplin2ther—maI.mechanicals仃essduringthewearprocess.Thehigherthewearrateis.thelowermes仃essis.
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LIWcichi,HUANGBaohai,BIZhon曲o.The衄alstfessthe0吼appli—cation[M】.Beijing:ChinaElec硒cPublishingHouse,2004.(inChinese)Biographicalnotes
ZHAOXiniscurrcnnyworkingtowardhisPhDdegreeinDelfcUniversityofTecllIloIogy,Nemerlallds.HereceiVehismasterdegree丘omS诅teKcyLabo一眦oryofTractionPower’Soumwest
JiaotongUniversi够Ch试a,in2005.Heisengagedi11methennal
e腩ctsofwheel/miland
r01lingcontact州gue.
Tel:+86?28—87634355;E-mail:swjtIlzllaoxin@163.com
J矾XuesongiscufrentlyaprofessorjnStateKeyLaboratoryofTractionPower,SoumwestJiaotongUniVersity,China.HereceivedhisPhDde酽eeeom
StateKeyLaboratoryofTractionPower,Soulllwest
JiaotongUniversity,ChiIla,in2000.HisresearchfieIdincIudesrolIingcontactofwheel/rail.
Tel:+86—28-87634355;E—mail:xsjin@home.swjtll.e“.cn
ZHAIWanmingiscun℃ntlyapmfessor’aChan画iangscholarinS诅teKeyLaboratoryofThc廿onPower’SouthⅣestJiaotongUniversi饥China.Here.ceivedhisPhDdegree丘DmStateKeyLaboratoryofTractionPower’south.westJiaotongUniversity’Chilla,in1993.HisresearchfieldincludescouplingdynaIIlicsofmilvehiclesa11dtmcl(s.
1℃I:+86—28.87600773:E.mail:wmzllai@home.swjtu.edu.cn
p
H
陋
陋
口
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ANALYSIS OF THERMAL-ELASTIC STRESS OF WHEEL-RAIL IN
ROLLING-SLIDING CONTACT
作者:ZHAO Xin, JIN Xuesong, ZHAI Wanming
作者单位:State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031, China
刊名:
机械工程学报(英文版)
英文刊名:CHINESE JOURNAL OF MECHANICAL ENGINEERING
年,卷(期):2007,20(3)
被引用次数:1次
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14.DUSAN M;ALEKSANDAR R;LJUBOMIR B The influence of the heat-transition coefficients dependence upon speed on the accuracy of the block-braked solid wheel temperature state calculation 2001
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