預(yù)應(yīng)變A3鋼的力學(xué)性能實(shí)驗(yàn)研究.pdf

1、哈爾濱工程大學(xué)碩士學(xué)位論文預(yù)應(yīng)變A3鋼的力學(xué)性能實(shí)驗(yàn)研究姓名：吳國輝申請學(xué)位級別：碩士專業(yè)：固體力學(xué)指導(dǎo)教師：鄒廣平20030401哈爾濱工程大學(xué)碩士學(xué)位論文AbstractTheA3steeliSakindofplasticmaterialwhichweCOlTunonlyusedinourdailylifeandteaching，ButthereiSnotmuchstudyofmechanicalbehaviourofthemate

2、rialafterpretorsionandpretensionintensifyatpresentItisnotyetveryknownespeciallyofthemechanicalbehaviouraftersecondaryhardeningsuchastorsion—tensiontensionandtensiontorsion—tensionThemechanicalbehaviourofA3steelspecimenun

3、dermonotonictension、puretorsion，torsiontension，tension—torsion，torsion—tension—tension，tension—torsion—tensionwerestudiedbystandardcylinderspecimeninthispaperTherewereobviousyieldpointjogbothwhentheA3steelspecimenareunde

4、rmonotonictensionandpuretorsion，thisillustratesthatthereareobviousphysicalyieldprocedureintheseprocessWhenwedrawthestressstrainrelationofmonotonictensionandpuretorsionatthesamecoordinatenamelyequivalenteffectivestressand

5、equivalenteffectivestrainCOordinateItiSobviouslythattheequivalenteffectivestressstraincurveofmonotonictensionandpuretorsionarebasiclysuperpositionwhiletheequivalenteffectivestrainiSsmallerButequivalenteffectivestressleve

6、lofmonotonictensionwashigheralittlethanthatofpuretorsionWhiletheequivalenteffectivestrainwashighertherewassignificantdifferencebetweenthetwocurvegraduallyUndermacrostrainlargestrain，theequivalenteffectivestressofpuretors

7、ionwashighenTheequivalenteffectivestressstraincurveofpuretorsionWaSfivesixtimeslongerthanthatoftensionexperimentAfterpretorsionthesuccessortensileyieldlimitandstrengthlimitbothimprovedveryhighlybutthetrendoftheincreaseof

8、thestrengthlimitwassuspendedtillthepretorsionalcapacityreached17z，whenthepretorsionalcapacitywasgreaterthanl7才(prestrainvaluewas8119％oftotalstrain)，thesuccessorstrengthlimitrapidfailedandapproachedtheyieldlimitThisillust

9、ratetheA3steelspecimentranslatefromplasticityintofriabilityafterpretorsionstrengthenⅥmenthespecimenwasoperatedbytension—torsionaction、theyieldlimithadverylargeimproved，butthestrengthlimitchangedverylittleFurthermore，thet