復(fù)合材料對(duì)稱層合板的強(qiáng)度預(yù)測(cè).pdf

1、重慶大學(xué)碩士學(xué)位論文復(fù)合材料對(duì)稱層合板的強(qiáng)度預(yù)測(cè)姓名：王放申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：固體力學(xué)指導(dǎo)教師：張俊乾20040512重慶大學(xué)碩士學(xué)位論文英文摘要ABSTRACTAsanewtypeofmaterials，compositehasallencouragingprospectofpracticalapplications，especiallyinaeronauticandaerospaceindustriesbecauseoffair

2、lyexcellentthrough—thicknesspropertiesandlowercostofmanufacture，whichisausefulmultiphasematedalmadeofnot1essthantwomaterialsandatthesaITletimeithasuniquepredominantperformance，whichothertraditionalunitarymaterialsdon’tpo

3、ssessWithincreasingdevelopmentsofcompositematerials，howeveritisnoavoidancethattherearesomelocaldamagesandfracturesComparedwjtllmetalmaterialsthecompositematerialsownmolecomplexfracturemodels，iethefracturemodeloftheformer

4、appearsthatthereareonlysomeisolatecracks，whentheyareunderstaticorperiodicloading，whereasthelatter’Sruptureiscombinedwithmanyfractureandtheirinteractionsuchasmatrixcrackinginterfacenonglue，fiberfailureandfatiguedelaminati

5、onsandSOonMeanwhile，italsodependsonotherparameters：propertiesoffiberorresinlay—upconfigurations，solidifyingtemperature，environmentaltemperatureworkingconditionsItisnodoubtthatalldamageswillmoreorlessaffectinplanemechanic

6、alperformancesofcompositematerials，inparticularultimatestrengthInordertoresearchdamages’effectsoninplanemechanicalperformancesofcompositelaminates，theequivalentconstraintmodelisestablishedbyZhangtoanalyzeitwhichc8Ilconst

7、itutetherelationsbetweenstressandstrainoftheconsideredlaminaunderdamagesandtheonesbetweenitsstiffiaessanddamagesBasedupontheECMmodel，anewanalyticmodelforpredictingtheultimatestrengthofgeneralsymmetriclaminatesisstudied：i

8、tisreckonedthattheprimaryloadbearinglaminacontrolsthefiaz2failureofthelaminatesThuscompositelaminateswillbethoroughlydestroyedifthefiberoftheprimaryloadbearinglaminaisfracturedAsaresult，thelaminateswillnotbearadditionall

9、oadsanymoreThenthecurrentstresscorrespondstotheultimatestrengthofthecompositelaminatesInthatcase，thekeyistoattainthestressfieldoftheprimaryloadbearinglaminathroughtheECMandtheclassicallaminatetheoryApplyingthisnewmodelfo

10、rpredictingstrength，weinvestigatedifferentlaminaproperties，lay—upconfigurationsandcombinedloadingconditions’effectsonthestrengthanddrawstressstrainbehaviorsandfailureenvelopesofcompositelaminatesandcomparativefiguresbetw