泡沫聚合物蠕變行為研究.pdf

1、湘潭大學碩士學位論文泡沫聚合物蠕變行為研究姓名：毛快申請學位級別：碩士專業(yè)：一般力學與力學基礎(chǔ)指導教師：張俊彥20080517湘潭大學碩士學位論文AbstractThisdissertationconsistsoffivechapters.Thefirstchapterpresentsacomprehensivestudyofthehisticalcurrentstudiesinfoams.Chapter2theeticallyanal

2、yzesthemechanicalpropertyofclosedcelledfoamfocusesonthecompressionviscoelasticity.Itcarriedoutontheexperimentresearchtothecompressioncompressioncreepperfmanceofthetypicalclosedcelledfoam—EPSinChapter3.Chapter4throughthef

3、initeelementsimulatediscussesthedensitystressontheimpactofEPScompressioncreep.Bycombiningexperimentalstudytheeticalanalysisnumericalsimulationthemechanicalpropertiesofcompressioncompressivecreepofclosedcelledfoamareanaly

4、zedthoughly.Mainresearchresultsconclusionsareasfollows:1.Thedefmationmechanismofcompressionoftheclosedcelledfoamareanalyzeditispointedoutthateverystageofthecompressiveprocesscanbemodeled.Thedissertationspecificallyanalyz

5、estherelationshipbetweenelasticmodulusrelativedensityunderlinearelasticstage.2.Thedissertationresearchtheviscoelasticperfmanceoftheclosedcelledfoammaketheviscoelasticdefmationdifferentialequation.3.Thenitusesthetypicalcl

6、osedcelledfoam—EPStocarryoutcompressionexperiment.TheexperimentshowstherearethreestagesofEPS’scompressionstressstraincurve:elasticstageplasticyieldedplatfm’sstagetightstage.Thereisnotclearthresholdbetweentheelasticplasti

7、czoomsonthestressstraincurveunderthecompressionofEPS.Accdingtotheexperimentaldatatheelasticmodulusiscalculated.Itshowsthattherelationshipbetweenelasticmodulusrelativedensityfitthequadraticfunction.4.Thecompressivecreepex

8、perimentsarecarriedoutofEPS.Theexperimentsshowthateverycompressivecreepcurvecanbedividedintothreestagesnamelyinstantaneouselasticitystagetransientcreepstagesteadystatecreepstage.wecangetanimpactofstressdensityoncompressi

9、oncreep:thecreepofsamedensityEPSiswiththestressincreasesthecreepofthehigherstressismethanthelowerstressunderthesamestressdifferentdensitiesofEPSthecreepofEPSiswiththedensitydecreasesthecreepofthehigherdensityismethanthel