短纖維增強(qiáng)注塑制品力學(xué)性能預(yù)測.pdf

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