7050航空鋁合金結(jié)構(gòu)材料激光沖擊強(qiáng)化處理研究.pdf

1、中國(guó)科學(xué)技術(shù)大學(xué)碩士學(xué)位論文7050航空鋁合金結(jié)構(gòu)材料激光沖擊強(qiáng)化處理研究姓名：范勇申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：光學(xué)指導(dǎo)教師：王聲波2003.5.1生里型堂壁查叁堂墮蘭生堡皇一——AbstractWiththedevelopmentoflasertechnologypeoplebegantostudytheapplicationsoflaserinwhichmaterialsprocessingwith1asertechniqueiSave

2、ryimportantaspectLaserprocessingofmaterialsisoneofthemostpromisingresearchfieldswhichhavebeenadoptedbypeopleAsascientificaspect，laserprocessingisoneofmaterialsprocessingmethodswhichusingtheintensiveenergyflow(1ightbeam，e

3、lectronbeamorionbeamandSOon)Inwhichlasershockprocessing(LSP)techniqueiSoneofthemostimportantapplicationsoflasermaterialsprocessing。，Whenprocessingmaterialswithhighpowerdensity(≥10’W／cm2)shortpulse(～10‘9S)laser，thesurface

4、ofmaterialswillabsorbtheenergyoflaserexplodeandbegasifiedinveryshogtimeandbecomehightemperature(104K)，highpressure(GPa)denseplasmawhichspurtoutlapsingfromthematerialsaboutthesametimewhichgeneratesintensivehighpressuresho

5、ckwaveTheshockwavespreadsintotheinteriorofmaterials，WhenitSsurgepressureexceedsthedynamicyieldstrengthofmaterialsthisshockwavewillinduceplasticyieldonthesurfaceandiUtheinteriorofmaterialswhichCangeneratea10tofcrystaldefe

6、ctsuchasdislocation(sometimesCanbephasechangeinsomematerials)inthesametimeCallalsogenerateresidualstressinthesurfaceofmaterialsWithcomprehensiveeffectsofallthesefactors。themechanicalpropertyofmaterialscanbeincreased，such

7、asfatiguelife、hardness，abradabilityanderosionresistanceInthispaperthelaserinducedshockwaveiSstudiedThebasictheoryofionshockwaveiSanalyzedfromtheprocessofinteractionbetweenlaserandmaterialsandthefundamentalmathematicalmod

8、eliSstudiedAccordingtothefactofLSPweemphasizeondiscussingtheeffectofpulsewidthonLSPthroughstudyingtheeffectofwidthoflasertothewidthandSUrgepressureofstresswaveTherelationsbetweenlaserparametersandshockwave，technologicalc

9、onditionsandpropertyofmaterialsaresystematicanalyzedthroughexperimentalstudyonLSPofaerialaluminumalloystructuralmaterialsTheincreaseoffatiguelireiSanalyzedthroughSN(Stress—Number)curveandfatiguetestundervariedstress1evel

10、AtlastthenovelprocessingtheoryandwayiSgivenaccordingthespecialfactofLSPthefirsttimewhichcanassurefineprocessingresult，increasingthepropertyofaerialaluminumalloyandatthesametimesavingtimeandmonevKeyword：laserapplications，