HUNANUNIVERSITY毕业设计(论文)2015年6月9日设计论文题目:某型汽车驱动桥壳结构的疲劳寿命分析和预测学生姓名:蔡恒学生学号:20111201216专业班级:力硕1101学院名称:机械与运载工程学院指导老师:姜潮教授学院院长:韩旭湖南大学毕业论文原创性声明本人郑重声明:所呈交的论文是本人在老师的指导下独立进行研究所取得的研究成果。除了文中特别加以标注引用的内容外,本论文不包含任何其他个人或集体已经发表或撰写的成果作品。对本文的研究做出重要贡献的个人和集体,均已在文中以明确方式标明。本人完全意识到本声明的法律后果由本人承担。学生签名:日期:年月日毕业论文版权使用授权书本毕业论文作者完全了解学校有关保留、使用论文的规定,同意学校保留并向国家有关部门或机构送交论文的复印件和电子版,允许论文被查阅和借阅。本人授权湖南大学可以将本论文的全部或部分内容编入有关数据库进行检索,可以采用影印、缩印或扫描等复制手段保存和汇编本论文。本论文属于1、保密,在______年解密后适用本授权书。2、不保密√。(请在以上相应方框内打“√”)学生签名:日期:年月日指导教师签名:日期:年月日湖南大学毕业设计(论文)第页I某型汽车驱动桥壳结构的疲劳寿命分析和预测摘要驱动桥壳是汽车的主要承载件和传力件,它承受着汽车的荷重,并将载荷传递给车轮。此外,驱动车轮上的制动力、牵引力和侧向力也是通过桥壳传到悬挂和车架或车厢上。根据理论和实验研究,由路面不平产生的冲击力和交变载荷引起的疲劳失效是引起桥壳破坏的主要原因。由于驱动桥壳在汽车部件中的重要性,驱动桥壳的实际使用寿命直接影响汽车的实际使用寿命,因此,驱动桥壳要具备足够的刚度、强度和良好的动态特性,合理设计桥壳是提高汽车平顺性和舒适性的重要举措之一。本文基于有限元法分析理论,利用CAD软件UG对桥壳进行建模,然后将模型导入有限元软件ANSYSWorkbench进行静力分析和疲劳寿命分析,最后通过疲劳寿命分析来确定危险点并且提出相应的改进方案。关键词:驱动桥壳;有限元法;静力分析;疲劳寿命湖南大学毕业设计(论文)第页IIThefatiguelifeanalysisandpredictionofacertainvehicledriveaxlehousingconstructionAbstractThedriveaxlehousingisthemainlyload-bearingandforce-transmittingcomponentofthevehicle,itburdenstheweightofvehicleandtransferstheforcetothewheel.Inaddition,thebrakingforce,tractionforceandlateralforceonthedrivewheelsaretransferredtothesuspensionsystem,frameorcarriagethoughthedriveaxlehousing.Accordingtothetheoreticalandexperimentalstudies,themaincauseofthecrashofthedriveaxlehousingisincludedtheimpactforcegeneratedbytheunevenpavementandfatiguefailurecausedbyalternatingloads.Becauseoftheimportanceofthedriveaxlehousinginthecar,theactuallifeofthedriveaxlehousingdirectlyaffecttheactuallifeofthevehicle.Therefore,thedriveaxlehousingmusthavesufficientstiffness,strengthandexcellentdynamiccharacteristics.Rationaldesignofdriveaxlehousingisanimportantmeasuretoimprovevehiclerideandcomfort.Basedonthetheoryoffiniteelementanalysis,usingCADsoftwareUGtomodelonaxlehousing,thenimportthemodelintofiniteelementsoftwareANSYSWorkbenchtocarryonstaticanalysisandfatiguelifeanalysis,andfinallytodeterminethedangerpointsandproposeappropriateimprovementsthroughfatiguelifeanalysis.KeyWords:driveaxlehousing;finiteelementmethod;staticanalysis;fatiguelife湖南大学毕业设计(论文)第页III目录1绪论...............................................................................................................................................11.1课题背景............................................................................................................................11.2国内外研究现状................................................................................................................11.3课题研究的目的和意义....................................................................................................31.4本文研究内容....................................................................................................................41.5本文研究方法....................................................................................................................41.6本章小结............................................................................................................................42驱动桥壳有限元模型的建立.......................................................................................................52.1有限元法简介....................................................................................................................52.1.1有限元法的基本思想.............................................................................................52.1.2有限元法的分析步骤.............................................................................................52.2有限元软件ANSYS及ANSYSWorkbench简介..........................................................62.3驱动桥壳几何模型的建立................................................................................................62.4驱动桥壳有限元模型的建立............................................................................................72.5本章小结............................................................................................................................83驱动桥壳有限元静力分析...........................................................................................................93.1各种典型工况及其载荷计算............................................................................................93.2各种典型工况下的有限元分析......................................................................................103.2.1最大垂向力工况下的有限元分析......................................................................103.2.2最大制动力工况下的有限元分析.......................................................................113.2.3最大侧向力工况下的有限元分析......................................................................123.3本章小结..........................................................................................................................134驱动桥壳疲劳寿命预测.............................................................................................................144.1疲劳分析理论基础..........................................................................................................144.1.1疲劳的特点以及分类.................................................................................