复合型裂纹断裂的新准则
第1期 任利等: 复合型裂纹断裂的新准则
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NEW FRACTURECRITERIONFOR MIXED MODECRACKS
11122
LiRenheminZhuinzhiXieuZhaninAi Z L R ggg Tg
1 (KeLaboratoroEnerEnineerinSaetand Disaster Mechanics,MinstroEducation,y yf gy gg fyyf
)ColleeoArchitectureand Environment,Sichuan UniversitChendu,610065 gf y,g2 (State KeLaboratoroHdraulicand Mountain RiverEnineerinSchooloWaterResource y yf ygg,f
)Hdroower,Sichuan UniversitChendu,610065and ypy,g
,AbstractormixedmodeIIIcracksthelasticzonedistributionaroundcracktisisanalzedtheo F - -ppy
,reticall.Twoofwhichcanbeusedtoevaluatetheeffectofcracktistressfieldonrousarameters ypgpp
,,,crackroaationlasticareintroducedwithlocaldeformationbeinconsidered.Inthisstudweadot ppgpgyp :()thefollowintwoassumtions1cracksinthedirectioninwhichthereionboundarisroaatelastic gpgyppgp
()theshortesttothecrackti2oncetheradiusfromcracktitotheshortestlasticreionboundarrea -p;ppgy ,,chesthecriticalvaluethecrackstartstoroaate.Basedontheseassumtionsanewfracturecriterion ppgpformixedodecrackisdeveloed.Thecomarisonswiththeexistinfracturecriterionsandtheexeri -m -ppgp mentalresultsshowtheresentcrackroaationcriterionivesanareementoodredictionwiththe pppggggp,,exeriments.Moreoverthelimitationoftheexistinsinlearameter(KⅠCorKⅡC)criterionareresent pggpp andtheeffectofthecracktistressfieldonthemixedodecrackroaationisalsodiscussedindetail. -m pppg
,,Kewordsixedmodecrack,initiationanlefracturecriterioncriticalradius m gy