角焊縫搭接接頭疲勞壽命預測研究.pdf

1、Y1040315分類號：王墮322墨密級：UDC：24學號：東南大學⑧碩士學位論文角焊縫搭接接頭疲勞壽命預測研究研究生姓名：奎苤導師姓名：璺湛送夔授申請學位級別王堂塑論文提交日期至壁籃生蘭且絲目學位授予單位盔畝太堂答辯委員會主席董爨童熬授學科專業(yè)名稱縫拽工毽論文答辯日期至QQ魚璽壘且墨目學位授予日期圣Q蝤生且目評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