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1、哈爾濱工業(yè)大學(xué)工學(xué)碩士學(xué)位論文AbstractDifferentfromtraditionalmaterials,compositematerialhasmanyobviousadvantages,suchashighratioofstrengthtoweight,highratioofstiffnesstoweight,highthermalexpansioncoefficient,hightemperatureresistance,fatigueresistance,impactresistance,andsoon,thereforeith
2、asbeenwidelyappliedtothefieldofaeronauticsandastronautics.Thedesignabilityofcompositematerialsisoneofmajorcharacteristics,materialdesignandstructuraldesigneventuallyreachedahighdegreeofunitybychangingtheangleofthelayerandstackingsequence,layerarea,socompositeoptimizationhasp
3、racticalsignificance.Inthepresentfieldofengineering,therearemainlytwoproblemsfortheoptimizationdesignofcompositematerials,oneistheengineeringsimulationofcompositematerialmainlyusestheFEM.Now,thecommercialFEMsoftwaredoesn’tcombinetheoptimizationalgorithmforcompositematerials,
4、sotheresearchersneedtowritethefiniteelementprogramandoptimizationalgorithmforaspecificproblem.Notonlyincreasetheoptimizationcycle,generalwon'twork.Theotheroneisthecompositedesignexitsahugenumberofdesignvariablescomparedtometalstructure,eachdesignvariableincludingthediscretev
5、ariablesandcontinuousvariablesinfluencesmutually..Inordertoimprovetheefficiencyofoptimization,itisnecessarytochooseasuitableoptimizationalgorithmandreducethenumberofdesignvariable.Fromtheviewpointofengineeringpractice,theexplorationofoptimizationofcompositefiberstackingisfin
6、ished.Firstlyresearchtheconstitutiveequation,failuretheoryandthefiniteelementtheoryoflaminateandsandwichstructure,thenfindamethodofCADandCAEconversion,bywhichmethodestablishedanalyzingthedigitalwingstructure;SecondlywiththeaidofMatlabgeneticalgorithmtoolbox,codesgeneticalgor
7、ithmprogramandperfecttheprogramaccordingtocompositematerialengineeringoptimization,improvingtheefficiencyofoptimizationbycombinationoptimizationstrategy.FinallyconstructoptimizationplatformbysoftwareIsight,whichintegratestheMatlab,MSC.Patran/Nastranandontheplatformthestabili
8、tyofskin,wingbendingstiffnessandstrengthofhoneycombsandwichstructureissimul
