基于内聚力单元的层合板低速冲击响应模拟分析

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1、中北大学学位论文theimpactors,theimpactorientationsoftheimpactor,andthehybridizationsofcarbonfiberandaramidfiber,respectively.Theresultswereachievedthroughthesimulations,whichwereillustratedasfollowing:(1)Whenthegeometryshapeoftheimpactorbecamesharper,itwouldcausemuchmore

2、damagetothelaminates.(2)Whentheimpactorientationswereon2Dplanewhichwasverticaltothelaminate,theincidenceanglehadagreateffectontheimpactresponses.Thecauseddamageextentsincreasedfirstlyandthendecreasedwiththeincreaseoftheincidenceangles.Andwhentheincidenceanglereac

3、hed45º,themostextentofdamagewascaused.Whileacertainanglewasformedbetweentheimpactorientationandlaminatedplane,thevariationoftheincidenceangledidnothaveasignificanteffectontheresponse.(3)Asforthehybridlaminateswithcarbonandaramidfibers,theincreaseofthecontentsofth

4、ecarbonfiberhelpedtoincreasetheimpactresistanceofthelaminates.Andwhencontentofcarbonfiberwasequaltotheoneofaramidfiber,thelaminatewithaalternatingstackingsequencehadbetterimpactresistance.Keywords：Compositelaminates,cohesiveelements,low-velocityimpact,FEAsimulati

5、onIII中北大学学位论文目录第一章绪论1.1课题研究背景和意义...............................................11.1.1课题研究背景...............................................11.1.2课题研究意义...............................................21.2国内外研究研究进展...............................................31.2.1

6、国内外层合板的低速冲击研究.................................31.2.2国内外层合板的低速冲击模拟研究.............................51.3本文研究内容.....................................................8第二章复合材料层合板低速冲击损伤理论2.1复合材料层合板的层内损伤理论.....................................92.2复合材料层合板的层间损伤理论.............

7、.......................122.2.1内聚力单元的介绍..........................................132.2.2内聚力界面单元的本构模型..................................132.3复合材料层合板的低速冲击损伤机理................................172.4本章小结........................................................19第三章动力学参数对层

8、合板冲击响应的影响3.1层合板低速冲击模型的建立与验证..................................213.1.1复合材料层合板低速冲击有限元模型的建立....................213.1.2复合材料层合板低速冲击模型的验证..........................233