斷裂力學(xué)中的守恒積分.pdf

1、哈爾濱工業(yè)大學(xué)碩士學(xué)位論文斷裂力學(xué)中的守恒積分姓名：代晶輝申請學(xué)位級別：碩士專業(yè)：固體力學(xué)指導(dǎo)教師：程靳20050601：窒至鎏；!：些查蘭!；蘭堡!：蘭竺鎏蘭AbstraetTheJintegralisresearchcontentasfractureparameterinthepaperTheJintegralofrandomloopforthecrackintheinterfaceofdouble—medialaminarcomp

2、lexmaterialiszeroTheconservationoftheclosedjintegralisprovedThetheoreticalanalysisindicatesthatthejintegralofthecrackthatliesininterfaceoftwomaterialorparallelstotheinterfaceisconservationformulti—medialaminarmaterialsIt

3、providesatheoreticalfoundationforcharacterizingandmeasuringthefracturetoughnessofthemulti—medialaminarcomplexmaterialsAccordingtoEnergybalanceduringcrackextensionderivethepathindependent，一integralincludingbodyforces，ther

4、malstrainsandinertialofmaterialTheJintegralofpropagatingcrackispresentedastherateofenergyreleaserateWhenthermalloadisonlyused，J—integralofstaticcrackissimplifiedtoJ’integralTheJ‘integralincludeslineintegralofrandomloopan

5、dsurfaceintegraloftheclosedloopBytheuseoffiniteelementanalyticalmethodofelastic—plasticity，acalculationofJintegralforcrackswithdifferentlengthanddifferentpositionandparallelltodouble—mediamediuminterfacewasconductedThela

6、wwasstudiedforcracktipJintegralwhichvariesalongwiththecharacteristicdiversityofdoublephasedmediummaterialandthedifferentdistancesbetweencrackandinterface，AnalyticalresultindicatesthattheJintegralforcrackslieinhardmediumi

7、S1essthan也at1ieinsoftmediumWhilethecrackjSclosetotheinterface，theJintegralinhardmediumwillincreaseandthatinsoftmediumwilldecreaseTheJintegralwillincreasethatthelengthofthecrackwillincreaseBytheuseoffiniteelementnumerical