某船體鋼在扭轉(zhuǎn)載荷下屈服過程的研究.pdf

1、哈爾濱工程大學(xué)碩士學(xué)位論文某船體鋼在扭轉(zhuǎn)載荷下屈服過程的研究姓名：王美榮申請學(xué)位級別：碩士專業(yè)：材料物理與化學(xué)指導(dǎo)教師：劉瑞堂20060101哈爾濱■：耩大學(xué)研究生學(xué)位論文AbstractTheyieldprocedureandmechanicsofsteel35undertorsionalIoadwerestudiedbystandardcylinderspecimeninthispaper。Theresultsindicatedth

2、attheyieldstrengthofsteel35undertorsionalloadderivedaccordingtoGBj028—88vcasnotaccordancewi疆eitherMisesor豫seayieldcriterionsandtherelativeerrorwasseparately20％and277％TheerrorstuckoutamileInthispap盯，theyieldprocedureofthe

3、matorialundertorsionalloadwasresearchedTheformulasoftheyieldstrengthofsolidcylinderspecimenandhollowcylinderspecimenweremadeout確eformulawasseparatelyTheformulawasderivedtooTheyieldstrengthderivedaccordingtotheformulaofso

4、lidcylinderspecimenwasaccordancewithMisesandTrescayieldcriterionsmuchbetterandtherelativeerrorwasseparately17％and6O％露1eresultSofhollowcylinderspecimenexperimentsindicatedthattheyieldstrengthformulaofhollowcylinderspecime

5、nwasexactlySo，anoutlookthattheassurancecoefficient櫛。neededtolargerthani25duringverifiedthestrengthofthematerialswasmadeoutinthispaperIntheshearstressshearstraincoordinatesystem，whenthematerialwasinwhollyyieldstage，thestr

6、essofhollowcylinderspecimenswhichwereintheSalTleexternaldiameterbutindifferentinnerdiameterwascomputedttwasverifiedthatthemaximumstressof氆ematerialsundertorsionalloa矗wasat氆eoutmostzonefibersWhenthetorqueincreasedtothecer

7、tainvalue，theplasticdeformationwashappenedtotheoutmostzonefibersfirstly，buttheinnerfiberswereinelasticstageWhenthetorquefurtherincreased，theinnerfibersenteredtheplasticstagetooItwasshowninthestress—straincurvethatthestre

8、ssofthematerialinwhollyyieldstageincreasedgraduallyWhenthewallthicknessofthespecimenincreasedtothesolid，theyieldstrengthofthethick—wallhollowcylinderspecimenwasapproachtothesameextornaldiametersolidcylinder’sWhenthewallt

9、hicknessofthehollowcylinderspecimenwasO4一lmm，thestressofthematerialinoriginalyieldstagewasequaltothestressofthematerialinwhollyyieldstage，Andthestressvaluewasapproximatelyequaltothestressofsolidcylinderspecimeninoriginal