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ID:36471300
大小:1.57 MB
页数:47页
时间:2019-05-11
《三维复合型弹塑性断裂研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、南京航空航天大学硕士学位论文三维复合型弹塑性断裂研究姓名:王芳丽申请学位级别:硕士专业:工程力学指导教师:郭万林20090301三维复合型弹塑性断裂研究AbstractWiththerapiddevelopmentofscienceandtechnologyandmaterialsinsuchapplicationareasasaviation,aerospace,automotive,shipbuilding,civilengineering,andsoon,thelarge-scaleandmicro-s
2、calebecomethetrendoftherealstructure.andthethree-dimensionalmixed-modeplasticFractureisoneoftheformsofdamageinengineeringstructureastheloadingofthestructurehasbecomemoreandmorecomplicatedanddiverse.Basedonthethree-dimensionalI/IImixed-modeplasticfractureexp
3、eriment,wefocusedonthethree-dimensionalmixed-modefractureofStressfieldnearcracktipandthecrackangle.Themaincontentsareasfollowing:1.Itisshownthattheangleofthemaximumtangentialstressisthesamewiththeangleoftheminimumthree-dimensionalout-of-planeconstraintfacto
4、rundervariousmixedloadingconditionsofvariousthicknessesspecimens.ThecrackinitiationangleoffiniteelementcalculationbasedonthemaximumtangentialstresscriterionisveryclosetotheexperimentalmeasurecrackinitiationangleunderthemodeIloadingdominating(βeq>65.45°)exce
5、pt8mmthickness.2.Loading-displacementcurvechangeswiththeloadingangle,therelativisticlengthandthickness.ThethicknesseffectonloadingcurveunderthepureIloadingconditionsisthelargest,anditdecreasesthemodeIIloadingcomponentincreasing.Basedonloading-displacementcu
6、rve,loading-lengthofcrackexpandingisdrawnoutwhichcandeterminecrackinitiationloadingofstaticfractureexperiments.Keywords:Mixed-modecrack,Mixed-modetriaxialstressconstraintTz,Relativisticlengtha/W,Thicknesseffect,CrackopeningdisplacementII南京航空航天大学硕士学位论文图表清单图2
7、.1实验加载装置示意图................................................................................................................6图2.2试样形状及尺寸示意图............................................................................................................6图2.3三维弹塑性有
8、限元分析模型....................................................................................................7图2.4有限元网格.....................................................................................
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