高溫下工作的含缺陷構件安全評定方法的研究開發(fā).pdf

1、浙江工業(yè)大學碩士學位論文高溫下工作的含缺陷構件安全評定方法的研究開發(fā)姓名：黃小勇申請學位級別：碩士專業(yè)：化工過程機械指導教師：張康達2001.1.1塑堅三些查蘭堡主堂些堡壅笙!!!ABSTRACTTheruptureofcomponentscontainingdefectsinthepetroleumandchemicalequipmentoperatingathightemperatureismainlycausedbycrackpr

2、opagationundercircumstanceofcreep，andthecrackpropagationinthecreeprangeisdifferentnotonlyfromfatiguecrackpropagationbutalsofromfastcrackpropagationatnormaltemperatureSo，weneedmethodsfortheassessmentofcreepruptureathighte

3、mperatureForthepurpose，severalaspectsarestudiedasfollows：1Thispaperanalyzedthebasicprinciplesofrupturemechanicsatnormaltemperatureandhightemperature，andstudiedthedifferencebetweentheassessmentforthetwokindrupturesWhenass

4、essingthesafetyofcomponentsoperatingatnormaltemperature，first，wemakesurewhetherthecrackwillpropagateatpresentIffatigueloadingcarl’tbeneglected，weshouldalsoconsiderthecrackpropagationcausedbyfatigueloadingWhenassessingthe

5、safetyofcomponentsoperatingathightemperature，weshouldnotonlyassessthesafetyofcomponentsatpresent，butalsoassessthesafetyofcomponentsinfuturebecausethecomponentsoperateinthecreeprangeWitlltheincreasementoftime，creepstrainb

6、ecomegreat，andtheplasticstrainnearthecracktipbecomegreattoo，thenthecrackmaybegrowIffatigueloadingcan’tbeneglected，weshouldalsoconsiderthecrackpropagationcausedbytheinteractionbetweencreepandfatigue2Forcommonmaterialsofpe

7、troleumandchemicalequipmentoperatingathightemperature，thispapercollectedlotsofmechanicsandrupturepropertydata00papE、K|^、Jk、6c、athightemperature，parametersAandqusedtoderivecreepcrackpropagationrates，creepstrainversustimec

8、urvesandstresstoruptureversustimetupturecurvesfrominsideandoutsideMeanwhile，severalexperimentsaremadetovalidatetheconsistencyofthemeasuredandthestandardvalues3Havingstudiedrelatedmethodsforthesafetyassessmentofcomponents

9、operatingathightemperature，thispaperputforwardamethodfortheassessmentofcrackcreepruptureathightemperatureThismethodisusefulfromcreeptemperaturetothemaximumtemperatureprescribedbyrulesThismethodhaveconsideredthecrackpropa

10、gationcausedbytheinteractionbetweencreepandfatigueMeanwhile，thispaperputforwardanoptimizedmethodusedtosolvehowtodividetheremnantlifeofcomponents，whichunitetheastringencyofcalculatedresultswithcalculatingworkload4Accordin

11、gtothismethodforthesafetyassessment，thispaperworkoutacalculatingprogram(MACCR1)，usingCcomputerlanguage，andit’SvalidatedbycalculatingexamplesKeywordspetroleumandchemicalequipment，creep，fatigue，crack，rupture，methodsforthes