角焊縫搭接接頭疲勞壽命預(yù)測研究.pdf

1、Y1040315分類號(hào)：王墮322墨密級(jí)：UDC：24學(xué)號(hào)：東南大學(xué)⑧碩士學(xué)位論文角焊縫搭接接頭疲勞壽命預(yù)測研究研究生姓名：奎苤導(dǎo)師姓名：璺湛送夔授申請(qǐng)學(xué)位級(jí)別王堂塑論文提交日期至壁籃生蘭且絲目學(xué)位授予單位盔畝太堂答辯委員會(huì)主席董爨童熬授學(xué)科專業(yè)名稱縫拽工毽論文答辯日期至QQ魚璽壘且墨目學(xué)位授予日期圣Q蝤生且目評(píng)閱人工邀出夔授唐塞題毫工2006年3月AbstractStudyonFatigueLifeEstimationofWelded

2、LapJointsGraduatestudent：LJRongSupervisor：QIUHougxingAbstractCurrentlytheMinerlinearcumulativedamagemodelistheonewhichisappliedmostabroadButtheMine’smodelhesn’tconsidercdtheinfluencetocumulativedamageoausedbytheloadhisto

3、ryandthereciprocityofthemSoitwillresultinelTorwhencalculatingthefatiguelife，anditissignificanttostudyOilthevariablefatiguelifeandthecumulativedamagetheoriesInthispaperthediffemncebetweenconstantandvariablefatiguelifeisst

4、udiedbytestsonfourweldedjointsunderuniaxialconstantorvariableamplitudecyclictensileloadingsBycomparingwiththedatainotherliteratures。itisfoundmaybeinsecurethattoestimatevariablelifebytheMiner’smodeland＆ⅣCUlNen峙strailldist

5、ortionandlivesalenolod；thestrainloadingcurvesdistortioncyclictimescalvesandloadingdistortionctⅡves搬portrayedAnonlinearcumulativedamagemodelbasedonresidualstiffnessisproposed111eparticularexpressionofthismodelunderthetest

6、ingconditionisproposedbytestresultsItisfoundwellthattoestimatelifebythismodelSomemethodstocalculatevariablelirearediscussedwiththetestresultsStressconcentrationendfatiguelifeoftheweldediointsisanalyzedTheresuItsshowthatt

7、heinfluencetostressconcentrationandfatiguelifeproducedbythedimensionsofthejointsisgreaterthanthatproducedbytheshapesoftheweldTheresultsalsoshowthatthestressconcentrationcoemcientistheleastwhentheratioofthemaina／Tootplate

8、tothecoverboardequalto06AformulaisproposedtocalculatethestreSSconcentrationcoefficientItiSprovedthattheformulaisveryprecisebycontrastingtheresultscalculatedbytheformulaandANSYSKeywords：fatiguelife；damage；variableamplitud