短纖維增強注塑制品力學性能預測.pdf

1、鄭州大學碩士學位論文短纖維增強注塑制品力學性能預測姓名：董燕妮申請學位級別：碩士專業(yè)：材料加工工程指導教師：申長雨趙振峰20070425鄭州人學碩學位論文ABSTRACTBecauseoftheirgoodmechanicalpropertiesandconvenientprocessingtechnics，theshortfiberreinforcedinjectionmoldingproductsarewidelyusedinman

2、yfields，forexample，aviation，spaceflightautomobileandshippingInordertodesigntheproductsthatcallanswerfortheproducingrequirementthispaperistostudytheproducts’macromechanicalpropertiesanditsdifferentforecastingmethodsontheb

3、asisofmicromechanics，andcomparetheresultsofdifferentmethodstoeachotherAtfirst，theclassicalproblemsinmicromechanicstheproblemofEshelby’SsingleinclusionininfinitematrixandequivalentinclusionafcintroducedThenthemechanicalmo

4、delsofunidirectionalshortfiberreinforcedcompositesdevelopedbytheformerresearchersareanalyzedandcorrespondingcomputerprogramofsomeofthesemodelsarebuilttooItisfoundthattheTandonWengmodel’SresultsarerelativelypreciseTheresu

5、ltsofTandonWengmodelCallexactlyreflecttherelationshipbctweerlthenlacro—mechanicalpropertiesofunidirectionalshortfiberreinforcedcomposites’andthepropeniesofthecomponentsorfibervolumefractionaspectratioAtpresentthereisamet

6、hodofpredictingmisalignedfiberreinforcedmechanicalpropertieswhichiswidelyusedinmostofsimulationsoffwares—MoldFlowands0onItCanbedividedintothreestepsFirsLthefiberorientationfunctionistransformedtoorientationtensor；then。th

7、etensor’SeigenvaluesandcorrespondingeigenvectorsCallbenumerated，theeigenvectorsshowsthefibersorientationthecorrespondingeignevaluesmeanstheprobabilityofthefiberorientation；fmallythesummationofthestiffnessmatrixofthefiber

8、orientalionmultiplytheeigenvalueisthecompositesstiffnessmatrixThemethodisusedforimprovingthenumeratingefficiencyconsequentlytheresultsofthismethodisnotexactenoughWewillcomparethismethodtothelaminatedmethodthatwasnotpredi

9、gestedinordertoknowiftheusedmethodcananswerfortheengineeringrequirementUsingsseveraldifferentfiberorientafionfunctionsthe／awsofhowthedifferencesoftheresultsoftwomethodschangewimthefibers’volumefractionaspectratio，willbed