資源描述：
《噴丸殘余應(yīng)力場(chǎng)與三維次表面裂紋應(yīng)力強(qiáng)度因子求解》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、上海交通大學(xué)碩士學(xué)位論文應(yīng)力強(qiáng)度因子在數(shù)值上要小于表面裂紋的應(yīng)力強(qiáng)度因子，即殘余應(yīng)力場(chǎng)對(duì)萌生于材料表面的裂紋擴(kuò)展速率的影響更為明顯。次表面裂紋靠近有限邊界的前緣對(duì)應(yīng)力變化以及距離邊界的尺寸的變化更為敏感。關(guān)鍵詞：應(yīng)力強(qiáng)度因子，次表面裂紋，三維權(quán)函數(shù)，殘余應(yīng)力，噴丸II萬方數(shù)據(jù)上海交通大學(xué)碩士學(xué)位論文RESIDUALSTRESSESANDTHREEDIMENSIONALSTRESSINTENSITYFACTORSOFSUBSURFACECRACKSFORSHOT-PEENED-MATERIALSABSTRACTAst
2、hemostusefulmethodtoimprovethesurfaceconditionsandincreasethefatiguelifeformaterialsandstructures,shot-peeninghasbeenwidelyusedinthedesignofaerospaceandautomobilecomponents.Themainmechanismofshot-peeningistheintroductionofresidualcompressivestressfield,whichca
3、nchangethecrackinitiationlocationsanddecreasethecrackpropagationrate.Thus,quantitativestudyoftheresidualstressesandthestressintensityfactorsaftershot-peeninghasbeenanimportantsubjectintheoreticalandpracticalfield.Firstly,withthecomparisonbetweenthepredictionsa
4、ndtestresultsofvariousshot-peenedmetals,thecapabilityoffivesolutionsincludingempiricalequations,theoreticalmodelsandFEMmodelsforpredictingthecharacteristicparametersofresidualstressfieldwasproved.TheempiricalequationsofYaohadgoodpredictionsfor40Crsteelandother
5、similarsteels，andtheempiricalequationsofWangwerecapableofvariousmetalswhiletheoreticalmodelsweresuitableformetalswithmediumstrengthandhardeningrate.Thepredictingresultsofsingle-shotFEMmodelsforcalculatingthepeeningdentsdiametersandmulti-shotFEMmodelsforcalcula
6、tingtheresidualstressfieldwereingoodagreementwithtestresultsofvariousmetalswithdifferentshot-peeningcoverage.Inpractice，combinationsofthesemethodswereneeded.Secondly,tostudythebehaviorandthethreedimensionalstressintensityfactorsofsubsurfacecracks,thecrackbodyw
7、asconsideredasellipticalcrackanddecomposedintotwokindsofslips,thatistheIII萬方數(shù)據(jù)上海交通大學(xué)碩士學(xué)位論文fundamentalslipswithmulti-collinearcracksfeaturesandtheelastic-springslipswitheccentriccracksfeatures.Basedonthethreedimensionalweightfunctiontheory,thethreedimensionalwe
8、ightfunctionsofthesubsurfaceellipticalcrackswereachieved.Finally,onthebasisofthethreedimensionalsubsurfaceweightfunctions,thestressintensityfactorsofthe40Crsteelaftershot-peeningwe
