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ID:46739578
大小:1.74 MB
页数:9页
时间:2019-11-27
《筋的截面形状对薄壁结构振动疲劳性能的影响》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第8卷第2期航空工程进展V01.8No.22017年5月ADVANCESINAERoNAUTICALSCIENCEANDENGINEERINGMay2017文章编号:1674—8190(2017)02—190—09筋的截面形状对薄壁结构振动疲劳性能的影响刘双燕,涂玉倩,苗应刚,李玉龙(西北工业大学航空学院,西安710072)摘要:筋条的截面形状对薄壁结构的振动疲劳性能具有重要影响。对L型和T型加筋薄板进行振动试验,研究固支条件下L型筋和T型筋对薄板频率和振动疲劳寿命的影响,并从理论角度分析其原因;利用MSC有限元
2、软件研究在正弦分布载荷下六种不同截面形状(矩形、L型、T型、I型、z型、Ⅱ型)的筋条在给定边界条件(固支、简支)下,对薄板的频率、应力和振动疲劳寿命的影响,并对加筋板的寿命进行预测。结果表明:六种加筋构型中,Z型加筋板的第一阶固有频率最大,加筋板VonMises应力最大点出现在同样的位置;固支条件下,加筋板的破坏位置在板的左右两侧,z型加筋板寿命最长;简支条件下,破坏位置出现在板的中央,L型加筋板的寿命最长。关键词:薄壁加筋结构;截面形状;固有频率;VonMises;振动疲劳寿命中图分类号:V214.4+2;03
3、46.2文献标识码:ADOI:10.16615/j.cnki.1674—8190.2017.02.011EffectsofStiffeners’CrossSectionShapeonThinWalledStructures’VibrationFatiguePropertyLiuShuangyan,TuYuqian,MiaoYinggang,LiYulong(SchoolofAeronautics,NorthwesternPolytechnicalUniversity,Xi’an710072,China)Abstr
4、act:Stiffeners’crosssectionshapeplaysanimportantroleonthevibrationfatiguepropertyofstiffenedpanels.ThevibrationtestsoftWOkindsofstiffenedpanelsarecarriedout.ThestiffenedpanelswithLshapedstiffenerandT-shapedstiffenerareexcitedbybasemotionattheresonancefrequenc
5、y,respectively.Theeffectsofdifferentstiffeners’shapeonthefrequencyandvibrationfatiguelifeofthin-walledstructuresarestudiedex—perimentally.ThepossiblemechanismisanalyzedtheoreticallyandthetestprocessisvalidatedbyMSCsoft—ware.BasedonthereasonableFEMsimulation,t
6、hethin-walledstiffenedpanelsareexcitedbyasinusoidaldis—tributedloadundertwoboundaryconditions(fullydampedandsimplysupported)inMSCsimulation.Theeffectsofstiffenerswithsixshapes(rectangle,Lshape,T—shape,I-shape,Z—shapeandⅡ一shape)onthefre—quency,stressdistributi
7、onandvibrationfatiguelifeofthinwalledstructuresarediscussed.Inaddition,thepre—dictedstudyonthelifeofstiffenedpanelarecarriedOUt.TheresultsshowthatthefirstnaturalfrequencyofpanelwithZ—shapedstiffeneristhemaximumamongalltheconfigurations.Thepeakvalueofthestress
8、OC—curredatthesameposition.Whentheedgesofthepanelarefullyclamped,thedamagepositionoccurredatthetwosidesofthestiffenerandthefatiguelifeofZ—shapedstiffenedpanelsisthelongest.Whentheedgesoft
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