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简介:Introduction.Poly(N-vinylcarbazole)(PVCZ)hasreceivedmuchattentionasarepresentativephotoconductivepolymerandextensivestudiesonmechanical,physical,chemicalandelectricalpropertieshavebeenreported'’.Ingeneral,thePVCZobtainedbyradicalandordinarycanonpolym...
简介:Theproblemofananti-planeGriffithcrackmovingalongtheinterfaceofdissimilarpiezoelectricmaterialsissolvedbyusingtheintegraltransformtechnique.Itisshownfromtheresultthattheintensityfactorsofanti-planestressandelectricdisplacementaroundthecracktiparedepen-dentonthespeedoftheGriffithcrackaswellasthematerialcoefficients.Whenthetwopiezoelectricmaterialsareidentical,thepresentresultwillbereducedtotheresultfortheproblemofananti-planemovingGriffithcrackinhomogeneouspiezoelectricmaterials.
简介:Aprobabilistieprogressivefailureanalyzingmethodisappliedtoestimatingthereliabilityofasimplysupportedlaminatedeompositeplatewithaninitialimperfectionunderbi-axialeompressionload.Theinitialimperfectionandthestrengthparametersareconsideredasrandomvariables.Ply-levelfailureproba-bilityisevaluatedbythefirstorderreliabilitymethod(FORM)togetherwiththeTsai-WustrengtheriterionandTancriterion.Currentstressesinthelaminatedstructurearecalculatedbytheclassicallaminationtheorywiththestiffnessmodifiedbasedonthelaststepplyfailure.Probabilistieallydominantply-levelfailurese-quencesleadingtooverallsystemfailureareidentified,basedonwhichthesystemfailureprobabilityisesti-mated.Anumeriealexampleispresentedtodemonstratethemethodologyproposed.Throughparameterstud-iesitisshownthatthedeviationoftheinitialimperfeetionandsomeofthestrengthparameterslargelyinflu-encethesystemreliability.