欢迎来到天天文库
浏览记录
ID:55771122
大小:21.63 KB
页数:3页
时间:2020-06-03
《双轴疲劳问题.docx》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Theinfluenceofconstantaxialcompressionpre-stressonthefatiguefailureoftorsionloadedtubespringsThispaperreportstheresultsofaseriesofbiaxialstaticcompressionandtorsionexperimentsperformedtoevaluatetheeffectsofstaticcompressionstressonthefatiguelifethosesmoothtubesmadeofhighstrengthsprin
2、gsteel.Compressionpre-stresswasintroducedbyasolidsteelbarinsertedintoahollowspringandloadedwithascrew-joint.Theexperimentallyobtainedresultsshowasignificantextensionoffatiguestrainlifeasaresultofcombiningaxialcompressionloadingwithtorsion.Crackingbehaviorwasobservedanditwasnotedthatc
3、ompressionpre-stressescontributetoretardationofthefatiguecrackinitiationprocessand,consequently,contributetotheextensionoffatiguelife.Thefatigueshearcrackinitiatedinatransversedirection.Thiscrackcontinuestopropagateinthesamedirectionuntilitstartstopropagateasamacro-crackonthemaximums
4、hearplane.摘要:本文研究了一系列双轴压、扭组合静态力实验,以此来评估静态压应力对于弹簧钢光滑管疲劳寿命的影响。脱氧钢杆插入一个空心的薄壁弹簧钢管中,并且承受一个螺栓连接力,用此来引入压预应力。实验结果表明可以明显的延长疲劳应变寿命,这是因为轴向挤压和扭矩的同时存在。实验中观察到了断裂行为,并且注意到了压预应力有效地延迟了疲劳断裂的裂纹萌生阶段,因此,也有助于延长疲劳寿命。疲劳剪切裂纹萌生于一个横向的方向。该裂纹向着同一个方向传播直到它开始像一个大裂纹一样在剪切面内传播为止。1.IntroductionThefatigueanalysisofatypic
5、altorsionspringisrelativelysimpleifthespringissubjectedtolowamplitudeloadswherefatiguefailureoccursatahighnumberofcycles(e.g.106cyclesormore).Thefatigueanalysisofthespringisgreatlycomplicatedbythemulti-axialloadingathighamplitudeloadwherefatiguefailureoccursatunderalow-cyclefatigueco
6、ndition(e.g.lessthan5*105cycles).However,themanufacture’stestsoftypicalvehiclespringsprescribethatthespecimenshouldsurvivemorethan105cyclesatamaximumdynamicstressclosetotheyieldstrengthofthematerial[1,2].如果弹簧承受疲劳失效发生在很高的一个循环次数生(106或者更多)低振幅的载荷,扭力弹簧的疲劳分析相对的简单。而弹簧承受一个疲劳失效发生在一个低周、高振幅的多轴疲
7、劳载荷情况下(少于5*5*105),这时疲劳寿命的分析就非常的复杂。然后,车轮弹簧的产品却规定:试验件必须在处于最大的接近于材料的屈服应力应力的动态应力下要存活高于105循环。Aspring’sservicelifeisaffectedbymanyfactorssuchasthespring’ssteelquality,thespring’smanufacturingprocess,thesurfacequalityandthemaximumtorsionstress.Itisknownthattheextensionofatorsionspringlifeis
8、achievedbyth
此文档下载收益归作者所有