1、西南交通大學碩士學位論文P91鋼蠕變疲勞交互作用損傷模型研究及壽命評估姓名：魏峰申請學位級別：碩士專業(yè)：固體力學指導教師：戴振羽20081101西南交通大學碩士研究生學位論文第1I頁AbstractWiththerapiddevelopmentofmodemindustrytheimpactofcreep／fatigue紐dtheirinteractiononthematerialmustbetakenintoconsideration

2、inordertoCNSUrCthesafetyandreliabilityofequipmentswhichoperateunderhightemperatureconditionsThus，thepredictionofmateriallifeundercreep／fatigueandtheirinteractionisofgreatimportancetothedesign，selectkmandsafetyevaluationo

3、fhightemperatureresistantcomponentsThispaperanalyzesandresearchesthetestresultsofthecreep／fatigueandtheirinteraction，usingP91steel，andfindsoutthatthefatiguelifeincreasedwhilethecreeplifedecreasedunderthecreep／fatigueinte

4、ractionItisconcluded，therefore，thatthecreepdamageandfatiguedamagedonotnecessarilyenhanceandaccelerateeachotherundertheinteractionTheymayinhibiteachotheraswellWithmesodamagemechanicsanalysis，itisdiscoveredthatwhenmaterial

5、isdamagedtoacertaindegree，cavitymayresultinThen，someofthecavitiesatetensiledeformedduringtheprocessofcyclicloadingwhichcausesthemicrocracksinturnInotherwords，someofthecavitiescausedbythecreepdamagealeconsumedandthentrans

6、formedintomicrocracksresultedformthefatiguedamageduringeachcyclicprocessSo，thecreepdamageisinhibitedandthecreeplifeincreaseswhilethefatiguedamageisenhancedandthefatiguelifedecreasesundertheinteractionThecreepdamageindexa

7、ndfatiguedamageindexisintroducedintothecreep／fatigueinteractiondamagemodelwhenthelineardamageaccumulationmethodandcorrectionmethodarestudiedinthispapecAlso，theinteractioninfluencequantitywhichmeanstheinfluencethatthecycl