基于压差梯度的平流层飞艇艇囊应力计算和仿真

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1、2014年10月北京航空航天大学学报October2014第40卷第10期JournalofBeijingUniversityofAeronauticsandAstronauticsV01．40No．10基于压差梯度的平流层飞艇艇囊应力计算和仿真刘龙斌吕明云肖厚地曹帅(北京航空航天大学航空科学与工程学院，北京100191)摘要：平流层飞艇体积庞大，艇囊表面曲率小，因而蒙皮材料的局部应力集中极易导致飞艇艇囊蒙皮发生过大变形而迅速超压损伤破坏．基于飞艇艇囊内外压力压差梯度载荷条件，建立飞艇艇囊蒙皮受内外压差真

2、实工况下环向与轴向应力的理论计算模型，构建飞艇蒙皮应力分析的VonMises强度准则．并采用ABAQUS有限元软件非线性仿真艇囊蒙皮分别在超压300，500，800Pa载荷下的各点环向的YonMises应力状况．仿真结果与理论模型计算的应力值基本保持一致，飞艇艇囊蒙皮环向VonMises应力呈现随压差梯度增大而递增的规律，而轴向VonMises应力大小由环向VonMises应力、蒙皮局部经纬向曲率共同决定，且两方向的VonMises应力均与超压载荷大小成正相关关系，为飞艇艇囊蒙皮超压应力评估和强度计算提供

3、基础性研究．关键词：平流层飞艇；压差梯度；蒙皮；强度准则；超压中图分类号：V214．8文献标识码：A文章编号：1001．5965(2014)10．1386-06CalculationandsimulationofstratosphericairshipcapsulestressconsideringthepressuregradientLiuLongbinLtiMingyunXiaoHoudiCaoShuai(SchoolofAeronauticScienceandEngineering，BeijingU

4、niversityofAeronauticsandAstronautics，Beijing100191，China)Abstract：Thecapsulevolumeofstratosphericairshipswasusuallytoohugeandthesurfacecurvatureofbuoyancycapsulewassmall，SOlocalstressconcentrationofairshipenvelopecouldeasilyleadtolargetrans．formationandc

5、ausethecapsuletooverpressuredamageandblastquickly．Basingonthepressuregradientloadingconditionoftheinsideandoutsideoftheairshipbuoyancycapsule，thetheoreticalcalculationmethodofthehoopandaxialstresswasdevelopedundertherealoverpressureloadworkingsituation，an

6、dtheVonMi．sesstressstrengthcriterionwasproposedaswell．Thefiniteelement(FEM)analysissoftwareABAQUSwasusedtosimulatethehoopVonMisesstressunderthedifferentoverpressureloadsof300，500and800Pare．spectively．ThecontrastiveresultsshowtheVonMisesvaluesbetweenthesim

7、ulationandtheoreticalcalcula．tionareinconsistentnearly，andthehoopVonMisesstressofairshipcapsuleenvelopeincreaseswiththein-creasingofpressuregradient，WhiletheaxialYonMisesstressofairshipoverpressurecapsuleisdeterminedbythehoopVonMisesstressandenvelopelocal

8、curvatureofthewarpandweftdirectionstogether，moreover，thetwokindsofVonMisesstressassociatedwiththeoverpressureloadispositivelycorrelatedatdifferentdi．rections，whichprovidestheeffectivebasisresearchofstressevaluationa