液壓脹形汽車橋殼強(qiáng)度剛度及疲勞壽命分析.pdf

1、燕山大學(xué)碩士學(xué)位論文液壓脹形汽車橋殼強(qiáng)度剛度及疲勞壽命分析姓名：崔亞平申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：車輛工程指導(dǎo)教師：王連東20050401鎏些奎主蘭蘭堡主蘭垡堡苧AbstractAutomobileaxlehousingshouldhaveenoughstrength，enoughstiffnessandlightweightasthesafetyandfunctionalpartofmotorvehicleThesinkbulgingcr

2、aftisanewtechnologyanditsadvantagesofnoanywelding，higherstrengthstiffnessandmaterialutilizationhadbeendiscoveredbyexperimentatioaHowever，atpresenttherulesofmaterialstraitt—hardeningisnotclear；theincreaseinintensityandsti

3、ffnesshasnotbeenanalyzedquantificationallyorprovedsystematically，saynothingofsupplyingthetheoreticbasistooptimumdesignAlow—volumepilotproductionofsinkingprocess，whichisamasteroperationinthehydroformingprocessforautomobil

4、eaxlehousing，isdoneinthispaperThenthesinkedtubes’compressiontestiscarriedoutinordertofindtheruleofmaterialhardeningoccurredinsinkingprocess，whichdisclosesthattheyieldstressincreaseby79O％thehardeningin由stsinkingamountsto8

5、66％ofthetotal；ThestrengthandverticalbendstiffnessofautomobileaxlehousingarecalculatedandanalyzedandthedistributionofstressandstrainisgivenwhenloadiS075tonTherelationshipbetweenmaterial—hardenandfatiguelifeofhydrobutginga

6、xlehousingisanalyzedquantitativelybasedonthemodifiedstresslifecurvewhenloadis075ton：thefatiguelifeincreasedby969timeswhenmaterialstrengthincreasedtO178limesthefailingstressincreasedby577％withsamefatiguelifeandthecarrying

7、powerincreasedby333％whenfatiguelifeis800，000timesThispaperperfectsthesinkbulgingcraft，providestheoreticalfoundationforoptimumdesign，andofferssoundreferencesforitsrealproductionKeywordsHydrobulgingautomobileaxlehousing；Si