跨中帶裂紋三點(diǎn)彎曲梁動(dòng)態(tài)應(yīng)力強(qiáng)度因子的權(quán)函數(shù)法研究

1、南京理工大學(xué)碩士學(xué)位論文跨中帶裂紋三點(diǎn)彎曲梁動(dòng)態(tài)應(yīng)力強(qiáng)度因子的權(quán)函數(shù)法研究姓名：曹俊俊申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：固體力學(xué)指導(dǎo)教師：陳愛(ài)軍20100501Abstract碩二l二論文AbstractWeightfunctionmethodsimplifiesconsiderablytheprocessofsolvingforstressintensityfactorsTheimportantfeatureoftheweightfunctio

2、nisthatitdependsonlyonthegeometryofthecrackedbodyIftheweightfunctionisknownforagivencrackedbodythestressintensityfactorduetoanyloadsystemappliedtothatbodycanbedeterminedbyusingthesameweightfunctionDevelopingasimpleandeff

3、icientmethodCanbeappliedtomanycomplexengineeringissuesInthisthesis，anewmethodispresentedtocalculatethedynamicstressintensityfactorsofthethreepointbendingbeam、析ⅡlthespreadingopentypecrackFirstlytheequationsforstressintens

4、ityfactorsundertworeferenceloadingconditionsareappliedon，andweightfunctionforbeamcontaininganedgecrackCallbeworkedoutSecondlythehistoryanddistributionofdynamicstressesinthethreepointbendingbeamarederivedbyvibrationanalys

5、isFinallythedynamicstressintensityfactorsequationsforbeam、杭manedgecracksubjectedtoimpulsiveloadaregivenindynamicweightfunctionmethodAndthelawofthestressintensityfactorisgotwhenitchanges、Ⅳiththecracklen垂hInordertobeverifi

6、edeasilythenumericalcomputationiscarriedoutwitllANSYSsoftwareatthesametimeAtwodimensionalfinlteelementanalysisofthree—pointbendingbeambasedonFEMhasbeencarriedoutstudythedynamicstressintensityfactorsThemodelofthreepointbe

7、ndingsampleisbuilttOgetthecrackopeningdisplacementofdifferentsampledimensionThedynamicstressintensityfactorcanbecalculatedfromthecrackopeningdisplacementbyFEMatdifferenttimeTheresultsofdynamicweightfunctionanalysisindica

8、tethattheprecisionofthedynamicstressintensityfactorissatisfactoryandthismethodCansimplifycalculationMoreoverloadingratehaveagreatimpactonthedynamicstressintensityfactorsWewilldevelopanin—depthstudyoftherelationshipbetwee