hts-a钢对接接头的双轴低周疲劳寿命研究

《hts-a钢对接接头的双轴低周疲劳寿命研究》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、武汉理工大学硕士学位论文AbstfaCtIntheengineering，weldedstructuresusuallybearcomPlieatedmultiaxialcyclieloading，andweldzone15thehotsPotoffatiguefailure.Consequentlyit15fullofvaluablesignificaneetostudythemultiaxialfatigueoftheweldedstrueturesundereomPlieatedstressorstrainstate.Theweldedjointoft

2、heeone一cylinder15ahot几tigUesPotofsubmarine，whiehbearlongitudinalbending，longitUdinaleomPressingandvertiealeomPressing.CombiningwithactualeomPlieatedstresssituationanddiseardingthelongitudinaleomPressingload，thePaperstudiesthebiaxialfatiguelifeatbuttjointofHTS一Asteelunderlongitudina

3、lcyelicbendingandvertiealcycliceomPressingload.TheP即erdeeomPosesfatiguelifeintotheengineeringeraek一initiationlifeandthecrack一ProPagationlife，andstUdiesfatiguelifeofbuttjointsofHTS一AsteelfromexPerimentalandtheoretiealanalysis.AdoPt3snunthickbuttjointsofHTS一Asteeltoearryonaxialandbia

4、xialfatigUetest.Axialloading15longitUdinalbending，andbiaxialloadingarelongitudinalbendingandvertiealeomPressing.MTSstructuraltestandanalysissystemandfacilitydesignedbyourselveseanearyoutaxialfatiguetestandmultiaxialfatiguetest.BeeauseoftheeomPlieatedfacility，there15norePortonthetes

5、t，andit15firstexPerimentalstUdy.“Reagentobservedmethod，，and“rustmarkmethod，，areProPosed，which15seaningcraek一initiationandreeordingcraekProPagationduringtest.Theymakeeertainbettermenttothetraditionalmethods，50theyhavemorePractieability.ThefractureformandfatiguelifeoftestsPeeimens15o

6、btainedunderaxialandbiaxialloading.It15shownthattheengineeringerack一initiationlifeean，tbenegligible.VertiealcomPressiveeyelicloadingshortensthefatiguelife，andaceeleratesthefatiguefailureoftestsPeeimens.Besides，thevertiealeomPressiveeyelieloadinghasgre滋erinflueneeonerack一initiationl

7、ifethanthecraek一gowthlife.WiththeratioofvertiealeomPressingstresstolongitudinalbendingstressgrowing，theratiooftheeraek一ProPagationlifetototallife15largerandlarger，buttheratioofthecrack一initiationlifetototallife15oPPosition.Estimatingcraek一initiationlifeadoPtsANSYStoealculatetheaxia

8、lstresseoneentrationfaetor