基于薄殼有限元法的帶旋轉(zhuǎn)自由度膜元研究.pdf

1、Y782605授予單位代碼學(xué)號(hào)或申請(qǐng)?zhí)柮芗?jí)鄭州大學(xué)碩士學(xué)位論文10459、020679論文題目：基于薄殼有限元法的帶旋轉(zhuǎn)自由度膜元研究作者姓名學(xué)科門類專業(yè)名稱黃明T學(xué)材料加工工程導(dǎo)師姓名、職稱：申長(zhǎng)雨教授趙振峰教授2005年4月15日AbstractMostinjection—moldedpartsarecomplicatedthin—shelllikestructure，SOthethinshellfiniteelementmetho

2、disusuallyusedtoanalyzethewarpageanddeformationofthepartsGenerally，wehaveseveraltypesofthinshellelementstobeused：flatshellelement，degeneratedshellelementandmulti—variableshellelement，ofwhichtheflatshellelementisadoptedmo

3、stwidelyduetoitssimplicityandisalsoselectedbymostfamousfiniteelementsoftwares，suchasABAQUS，ADINA，ANSYS，MARC，NASTRANandSAPHowever，thefiatshellhasitsowndisadvantages：Theprecisionofmembraneelementisnotperfectanditisdifficul

4、ttoconnectone—dimensionalelementandtwodimensionalelementTesolvetheproblems，somescholarsthoughtthatthedrillingdegreeoffreedomshouldbeaddedtomembraneelementInalloftherelatedresearches，Allman’SworkisdoubtlesslyamilestoneSin

5、cehesuccessfullyintroducedthedriLLingdegreeoffreedomforplanartriangleelementin1984，somerepresentativeelementswiththedrillingdegreeoffreedomhavebeendevelopedquicklyIthasbeenprovedthatthemembraneelementwiththedrillingdegre

6、eoffreedomcouldeffectivelyimproveelementprecisionOntheotherhand，thoseelementshavealsobeenfoundsomeshortcomings：someofthemhavetheSO—calledspuriouszeroenergymodeandthedrillingdegreeoffreedominmostelementshasnoexactphysical

7、meaningAtthesametimethecorrectnessofthedrillingdegreeofffeedomhasneverbeenproved，SOitisdoubtfulwhetherthedrillingdegreeoffreedomcouldcorrectlyconnectonedimensionalandtwodimensionalelementsandpassthetwistmomentTheabovepro

8、blemsseemtoexistinmostmembraneelementswithdrillingdegreeoffreedomToprovidearobustelementforwarpageandshrinkageanalysisinCAEofthepolymerprocessing，thepaperismainlyconcentratedonthestudyofmembraneelementwithdrillingdegreeo

9、ffreedom，andattheSalTletimedevelopsaflatshellelementThemainwerkiSasfollows：1Basedonthe6nodelineartriangularelement，themiddlenodesofedgeswereremoved，andanelementwithdrillingdegreeoffreedomwasderivedbymeansoflinearinterpol