高溫高壓換熱器法蘭開裂失效研究.pdf

1、學(xué)位論文創(chuàng)新性聲明本人聲明所呈交的學(xué)位論文是我個人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作及取得的研究成果。盡我所知，除了文中特別加以標(biāo)注和致謝中所羅列的內(nèi)容以外，論文中不包含其他人已經(jīng)發(fā)表或撰寫過的研究成果；也不包含為獲得西安石油大學(xué)或其它教育機(jī)構(gòu)的學(xué)位或證書而使用過的材料。與我一同工作的同志對本研究所做的任何貢獻(xiàn)均已在論文中做了明確的說明并表示了謝意。申請學(xué)位論文與資料若有不實之處，本人承擔(dān)一切相關(guān)責(zé)任。論文作者簽名：塑肇學(xué)位論文使用授權(quán)的說明本

2、人完全了解西安石油大學(xué)有關(guān)保留和使用學(xué)位論文的規(guī)定，即：研究生在校攻讀學(xué)位期間論文工作的知識產(chǎn)權(quán)單位屬西安石油大學(xué)。學(xué)校享有以任何方法發(fā)表、復(fù)制、公開閱覽、借閱以及申請專利等權(quán)利。本人離校后發(fā)表或使用學(xué)位論文或與該論文直接相關(guān)的學(xué)術(shù)論文或成果時，署名單位仍然為西安石油大學(xué)。論文作者簽名：導(dǎo)師簽名：注：如本論文涉密，請在使用授權(quán)的說明中指出(含解密年限等)。英文摘要Subject：TheHighTemperatureandHighPres

3、sureHeatExchangerFlangeCrackFailureStudySpeciality：MechanicalEngineeringName：WangYongqinInstructor：LiuHuiBaiXiaoming(signature)ABS’l’RAC’I’ThispaperismainlytotheresearchaboutflangecrackingdefectonaheatexchangerofYulinref

4、ineryfindsoutthereasonswhytheheatexchanger’Sflangecrack，andputsforwardthecountermeasuresSOastopreventthesimilarflangecrackandfailuretohappenagainThecrackedweldingneckflange’SinnerdiameterisO1200mm，theouterdiameteris①1495

5、mm，thekindofsealgroovesistrapezoidtrough，thematerialis16MnR，sealinggasketsistheoctagonalringThoughthePenetranttesting，findoutthecreakinthesealgroovefromtheinnerwall2838mm，themostwidthofcrackis4mmCrackdistributioncomplete

6、tumsealgroovesTheUltrasonictestingshowthatthecrackismostdeepabout1501TIITI(cracklengthisabout2200nⅢ1)；FromthetestresultsCanbeconcludedthattheflangecrackalmostthroughouttheflangethickness，belongstotheseriouscrackfailureFl

7、angefailureanalysisrelatedtotheoriginaldesign，flangemanufacture，theusageenvironment，therawmaterialsusedinsupplyandmanufacturing，andmanyotherfactorsInordertoknowthecausesofflangefailure，thispaperresearchfromtheaboveaspect

8、sonebyone，analysisthedetailofeachfactorpayattentiontoidentifythecauseofthefailureThroughchemicalcompositionanalysis，mechanicalpropertiestestingofmaterials，fracturesurfaceanalysis，Itisconcludedthatchemicalcompositionofthe

9、flangeisinlinewithnationalstandards；theflangematerialdoesnotexisttheproblemofinsufficientstrengthreserve；TheimpactpowerflangematerialislowerthanthatofthevalueofthetechnicalstandardThroughtheflangedesigntheoryandcalculate

10、theflange’Sforceonthepreloadedconditionandworkingcondition，andthroughtheflange’SstrengthcalibrationtocalculatetherelatedstressofflangeFlangestrengthcalibrationmainlythroughcalculatingtheaxialbendingstressO“zbetweenthefla

11、ngeneckandflangejoint，theflangeringradialstressO“r，andtheflangeringshearstressO“tThencomparetheO“z、仃r、O“twiththerange，sdesigntemperatI】reallowablestress【仃JfItisconcludedmatmenaIlgeintensitymeetstherequirements，theorigina