刀-屑摩擦對殘余應力分布影響的模擬分析.pdf

1、浙江大學碩士學位論文刀屑摩擦對殘余應力分布影響的模擬分析姓名：汪小芳申請學位級別：碩士專業(yè)：工程力學指導教師：郭乙木20040501浙江大學頊士學位論文刀一屑摩擦對殘余應力分布影響的模擬分析AbstractResidualstressesarethosethatareremainedinsidebodybutbalancedthemselvesafteralltheexternalloadsarcremovedWhenacomponen

2、tisundermanufacturingprocessitseasytObringresidualstresses111equalityofamechanicalcomponentsuchasitsgeometricalstabilityandfatiguelifearesignificantlyaffectedbytheresidualstressesMetalcuttinggenerallyinvolvesalargeanaoun

3、tofplasticdeformationandiscoupledthermomechaniealprocessItalwayscomeswithseveralhundredMPaofresidualstressesonthemachinedsurface，F(xiàn)romtheliteraturereviewonthestudyofresidualstressesinducedbymachiningprocess，itisclearthatt

4、heresidualstressesvarylargelywithcuttingconditionsandworkpiecematerialRecentlywiththeimprovementthatproductionpracticesrequire，it’SnecessarytopredicttheresidualstressesremainedinsidethepartCurrentlythedeterminationofresi

5、dualstressheavilydependsonexperimentationHoweverexperimentalapproachhasmanylimitationssuchastimeconsuminghighcostsetcInthepast，alargenumberofexpertandscholarhaveusedthefiniteelementmethodtosimulatethewholemachineprocess，

6、andhaspredictedthedistributionoftheresidualstressesunderthesurfaceItiSprovedthatthesimulationresultsareconsistentwellwiththeexperimentationStill，residualstressesarefoundtodependstronglyonthetoolchipfrictionTakingintoacco

7、untthatthecomplexityofthecontactbetweentoolandchip，it’Ssomemoredi硒culttoexpressaccuratelythe黼orionInmostcommonsimulationresearchersusedtotaketheCoulombfrictiontogaintherelationshipofshearstressandnormalstressatthetoolchi

8、pinterfaceinthisthesisWe’llfindthatthecoefficientoffrictionhassignificantinfluenceonthedistributionofresidualstressesTakingtheaveragecoefficientoffrictioninconventionalapproachobviouslysimplifiedthecomplexcontactbetweent

9、oolrakefaceandchipnlenWesuggestapolynomialmodeloffrictionBycomparingtheresultswiththosefromtheconventionalapproach，theanalysisoftheinfluenceofdifferentfrictionmodelupontheresidualstlcSsesisperformedKeywords：Finiteelement