铝合金疲劳损伤的多点快速非线性超声检测

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1、ắᦻᔠḄឋMULTI-POINTRAPIDNONLINEARULTRASONICTESTINGONFATIGUEDAMAGEOFALUMINUMALLOY!"#ᜧ2015%6ᨴ'ᑁ)*ᑖ,-：TG115.28᪥;ṹ：10213'▭)*ᑖ,-：621.791.16?@：AB"ắᦻᔠḄឋắẆDE：FG:HIᦟᣴLM:"ắN、P#：ᩞᧇS""Tᡠᙠᓫ：ᩞᧇNX"T▾Z[]：2015%6ᨴᣴ^ᓫ：!"#

2、ᜧClassifiedIndex:TG115.28U.D.C:621.791.16DissertationfortheMaster，sDegreeinEngineeringMULTI-POINTRAPIDNONLINEARULTRASONICTESTINGONFATIGUEDAMAGEOFALUMINUMALLOYCandidate：FengWeiSupervisor：Prof.GangTieAcademicDegreeAppliedfor：MasterofEngineeringSpeciality：Materia

3、lsProcessingEngineeringAffiliation：SchoolofMaterialsSci.&Eng.DateofDefence：June,2015Degree-Conferring-Institution：HarbinInstituteofTechnology!"#ᜧ"ắᦻ᤺⌕ᔠᵫpᐹᨵ?st、ᢙvᓄ、Ὂῖ⇨{

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6、ᔠ〉Ḅᬪᙽᦋᐭs，ᵨÅÅᦈḄᐭ¨¹᪵®¯ïឋ。ĹឋñᦪÍḄᓄ®¯ï，ÉឋñᦪᙠÏᓄ，ẆÖ：ñòÑÏ。，üÝẆÖឋñᦪᕜḄᓄ，ÉឋñᦪᕜSᕈᐜᓣ#$%&Ḅᓄ'(，üÝ)Ì᪵Ḅឋñᦪᙠ*ÄḄÍ，ɹ᪵+,Ḅ⊤¼。¾ï¹-.®¯/，ᵨᜮ、C12、3{Çȹᔠ᪵®¯ï，Éᓄ45， û6)⊤¼，ᜮôC12¹

7、$]Ḅ´7。üݹÏḄ³À8，9ឋñᦪXᩞᧇḄᱯ¼▤ȳᐵὶ，ᨬ>ÉïᩞᧇḄ¥?。ᐵ@A：Î；ឋ；；ᔠ；-I-!"#ᜧ"ắᦻAbstractAluminumalloyhasadvantagessuchasanti-oxidation,corrosionresistanceandlowdensity.Ithasbeenwidelyusedinaerospaceindustry,train,automotiveindustryandot

8、herfields.Aluminumalloystructuresfrequentlysufferfromfatigueduetoalternatingloads,whichoftenleadstocatastrophicconsequences.Currently,therearemanykindsofwaystoevaluatefatiguedamage,butmostofthemneedcomplexcalculations.Nonlinearultrasonictestingmethodiseasytouse

9、comparedtootherways,anditscharacterizationoffatiguedamageofmaterialsismoreintuitive.Ithasbecomeanimportanttechnologyinthefieldoffatiguedamagedetection.However,nonlinearultra