AZ31B鎂合金中強激光誘發(fā)沖擊波的實驗研究及數(shù)值模擬.pdf

1、江蘇大學(xué)碩士學(xué)位論文AZ31B鎂合金中強激光誘發(fā)沖擊波的實驗研究及數(shù)值模擬姓名：于水生申請學(xué)位級別：碩士專業(yè)：機械制造及其自動化指導(dǎo)教師：張永康姚紅兵20100606江蘇大學(xué)碩士學(xué)位論文AbstractLasershockprocessing(LSP)isanewsurfacehardeningtechnologyIthasbeenwidelyusedfortheresearchofmaterial’Ssurfacemodificati

2、onMagnesiumalloyisallimportantmaterialinaerospace，automotiveetcSoitismeaningfultostudyLSPonmagnesiumalloyThisstudycanbehelpfultoimprovethepropertyandfatiguelifeofmagnesiumalloyInthepresentwork，basedonthemechanismofLSPthe

3、inducedshockwaveduringLSPandthegenerationofresidualstresswasdiscussedThefiniteelementmodelwasusedtostudytheattenuationlawofthepeakpressureofstresswave，andtheresultswerecomparedwiththeexperimentalresultsAlso，theeffectofov

4、erlayandlaserpowerdensityonthepeakpressureoftheshockwavewasstudiedbyexperimentalmethodThemainresearchcontentsinthispaperarelistedasfollows：TheattenuationoftheshockwaveinmagnesiumalloywasinvestigatedbyFEM(FiniteElementMet

5、hod)simulationandexperimentFirst，throughdescribingsomekeyproblemsinthemodelconstruction，thefiniteelementmodelswereusedtosimulatetheattenuationoftheshockwaveinthemagnesiumalloyandtheaveragepropagationvelocityandthepeakpre

6、ssureoftheshockwavewereobtainedSecond，therelativepressuresoftheshockwavesweremeasuredbyPVDFgaugeTheattenuationlawoflasershockwavewasobtainedbymeasuringtheintensitypressuresOiltherearsurfaceofthetargetfordifferentthicknes

7、stheshockwaveshadpassedeachtimeThentheexperimentalresultswerecomparedwiththesimulationresultsandtheyagreewellTheresultsshowthattheaveragevelocityoftheshockwaveattenuationinmagnesiumalloyisingoodagreementwiththepropagatio

8、nvelocityofstresslongitudinalwave；thelawoftheshockwaveattenuationisexponentialInordertostudytheeffectofoverlayandlaserpowerdensityonshockwave，thelaserinducedshockwavewasmeasuredbyaPVDFgaugeandadigitaloscillographBasedont