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简介：Mechanicalandphysicalproperties,suchastensilestrength,elongationatbreak,modulusofelasticity,ShoreDhardness,meltflowrate(MFR),andelectricalandthermalconductivitiesofcompositeswithhighdensitypolyethylenematrixreinforcedwithAlpowderswereinvestigatedexperimentally.Measurementsofthemechanicalandphysicalpropertieswereperformeduptoareinforcingcomponentconcentrationof30%volumeAlpowderandcomparedwithmathematicalmodelsfromtheliterature.Theobtainedresultshaveshownthatexperimentaldatawereingoodagreementwiththeoreticaldata.Theultimatetensilestrength(UTS)andelongationatbreakdecreasedwithincreasingAlpowdercontent,whichwasattributedtotheintro-ductionofdiscontinuitiesinthepolymerstructure,andmodulusofelasticityincreasedwithincreasingAlcontent.Thecompositepreparationconditionsallowedtheformationofarandomdistributionofmetallicparticlesinthepolymermatrixvolumeforsystemhighdensitypolyethylene-Al(HDPE-Al).TherewasaclusterformationofAlparticlesathigherAlcontentsinthepolymermatrix.ElectricalandthermalconductivityvaluesofHDPE-AlcompositeswerehigherthanpureHDPEvalues.

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简介：TheconductivitybehaviorofAl(OH)3-acrylamidehybridpolyacrylamide(hybridPAAm)indistilledwaterwasstudied.Adiscontinuityphenomenonoftheconductivity(k)versusconcentration(c)curveofthehybridPAAminacertainconcentrationregimeisfound.ThisphenomenonisdependentonthemolecularweightofthehybridPAAmandontheparticlesizeandcontentoftheAl(OH)3colloidinthehybridPAAm.ThisphenomenonwasaccountedforassumingionizationofthehybridPAAm.

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简介：Fatiguepropertiesofage-hardenedAlalloy2017-T4underultrasonicloadingfrequency(20kHz)wereinvestigatedandcomparedwiththeresultsunderconventionalloadingofrotatingbending(50Hz).Thegrowthofacrackretardedatabout500μminsurfacelengthunderultrasonicloading,whileatabout20μmunderrotatingbending.Althoughstriationsbeingatypicalfracturemechanismwereobservedunderconventionalloading,mostoffracturesurfacewascoveredwithmanyfacetsunderultrasonicloading.Thesefacetswerealsoobservedunderrotatingbendinginnitrogengas.Thedifferenceingrowthmechanismdependingontheloadingfrequencyandtheretardationofacrackgrowthunderultrasonicloadingmaybecausedbytheenvironmentatthecracktipduetohighcrackgrowthrateunderultrasonicloading.

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