【叶片结构设计工程师,国电联合动力技术有限公司】前程无忧官方招聘网站

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1、【叶片结构设计工程师,国电联合动力技术有限公司】前程无忧官方招聘网站Theseloadscancausedamageorweakeningofthestructureespeciallyforagingmilitaryandcivilianaircrafttherebyaffectingitsloadcarryingcapabilities.Hence,arepairorreinforcementofthedamagedorweakenedpartofthestructuretorestorethestructuralefficiencyandthusassureth

2、econtinuedairworthinessoftheaircrafthasbecomeanimportantissueinrecentyearstomilitaryandcivilianaircraftoperators.TheUSAirForceinrecentyearshasshownconsiderableinterestintheuseofadvancedcompositestorepaircrackedmetallicaircraftstructurestoenhancetheirlife.Oneissuepreventingusingbondedcom

3、positepatches,asastandardmeansofrepairingdamagedmetallicaircraftstructuresisthefactthattheintegrityoftherepairsisunknown.Inthispaperthedesign,analysisanddurabilityofadhesivelybondedcompositepatchrepairsofcrackedaircraftaluminumpanelsisreported.Pre-cracked2024-T3cladaluminumpanelsof381×8

4、9×1.6mm(15×3.5×0.063in.)repairedwithoctagonalsinglesidedboron/epoxycompositepatchwereusedastestspecimen.Twodifferentcompositeplyconfigurations,5-and6-plywereinvestigated.Linearandnon-linearfiniteelementanalyseswereperformedonthetestspecimenusing8-noded24degreeoffreedom(DOF)hexagonalelem

5、entsforthealuminumpanel,boron/epoxypatchandadhesivematerialsubjectedtouni-axialtensileloading.Thestressdistributionsobtainedwereusedtopredicttheincreaseinstrengthanddurabilityoftherepairedstructure.Acomparisonofthestressvaluesatcriticalpointswasmade.Theanalysisalsowasusedtovalidatevario

6、usassumptionsmadeinthedesignofthecompositepatch.Experimentalinvestigationswereconductedonthecrackedaluminumpanelrepairedwitha5-plycompositepatchaswellasontwobaseline-unpatchedpanels(onewithacrackandonewithnocrack)byuni-axialtensiletestingtovalidatetheanalyticalresults.Theexperimentwasco

7、nductedontheInstrontension-testingmachine.Itwasfoundthatthemaximumskinstressdecreasessignificantlyaftertheapplicationofthepatchandtheregionofmaximumskinstressshiftsfromthecrackfrontforanunpatchedpaneltothepatchedgesforapatchedone.ArticleOutline1.Introduction2.Problemdefinition3