Predictionoftheoverallbehaviorofa3DmicrostructureofausteniticsteelbyusingFFTnumericalscheme

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• 作者：A. Belkhabbaz^a ; R. Brenner^a ; ^{renald.brenner@univ-paris13.fr"" rel=""nofollow} ; N. Rupin^b ; B. Bacroix^a ; J. Fonseca^c
• 关键词：FFTcomputation ; X-rayDiffractionContrastTomography ; 3Dmicrostructure ; polycrystallinecomputation ; homogenization
• 刊名：Procedia Engineering
• 出版年：2011
• 出版时间：2011
• 年：2011
• 卷：10
• 期：Complete
• 页码：1887-1892
• 全文大小：668 K

文摘

Thepresentworkinvestigatesthemechanicalresponseofapolycrystallineaggregatebythecombineduseof3DX-raydiffractioncontrasttomography(DCT)experimentandthefastFouriertransform(FFT)numericalhomogenisationscheme.Themicrostructureofarecrystal-lizedsampleof304LausteniticsteelhasbeencharacterizedwiththeDCTtechniqueatESRF(ID11beamline)whichallowstohaveaccesstothespatialdistributionandtheindividualshapeoftheconstituentgrainstogetherwiththeircrystallineorientati.Toestimatethemechanicalbehaviourofsuchrealpolycrystallinemicrostructure,themostwidelyusedapproachisbasedonthefiniteelementtechniquewhichimpliesatediousandcomplextaskofmeshing.Tocircum-ventthisdifficulty,anattractiveapproachistheFFT-basednumericalschemewhichallowstousethedigitalimageofthemicrostructureasadirectinputtocomputethemechanicalresponseofaheterogenesmaterial.Theefficiencyofthismethodcombinedwithexperimentaltomographicdataisemphasizedandtheelasticandelastic-plasticbehaviorofthepolycrystallinesampleisinvestigated.Comparisonsaremadewithestimatesdeliveredbytheself-consistentapproach,thatrelyonpartialinformationonthemicrostructure,andfirstorderbounds