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81.
斜放四角锥扁网壳的非线性弯曲理论 总被引:5,自引:2,他引:3
双层网壳是大型空间结构的主要结构形式,斜放四角锥扁网壳就是其中一种.它主要依靠上、下表层承受载荷,网壳腹部则比较空而且柔.根据斜放四角锥扁网壳的几何和力学特点,在三个基本假定的基础上,把它连续化并等效成一夹层扁壳.先从能量和内力等效的角度来分析它的本构关系,然后运用虚功原理,推导出斜放四角锥扁网壳几何非线性弯曲理论的基本方程. 相似文献
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Based on the large deflection dynamic equations of axisymmetric shallow shells of revolution, the nonlinear forced vibration of a corrugated shallow shell under uniform load is investigated. The nonlinear partial differential equations of shallow shell are reduced to the nonlinear integral-differential equations by the method of Green's function. To solve the integral-differential equations, expansion method is used to obtain Green's function. Then the integral-differential equations are reduced to the form with degenerate core by expanding Green's function as series of characteristic function. Therefore, the integral-differential equations become nonlinear ordinary differential equations with regard to time. The amplitude-frequency response under harmonic force is obtained by considering single mode vibration. As a numerical example, forced vibration phenomena of shallow spherical shells with sinusoidal corrugation are studied. The obtained solutions are available for reference to design of corrugated shells 相似文献
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空心球复合材料热弹性性质的一些精确结果 总被引:1,自引:0,他引:1
本文基于所提出的基体均匀场方法研究了空心球增强复合材料的热弹性性质·导出了均匀边界条件激发的局部热场和力学场量的关系,并进而得到了复合材料等效热弹性性质之间的精确关系·对于具有某种特定内外径比的空心球所构成的宏观各向同性复合材料,如果基体和空心球的热膨胀系数相同,可以证明其等效体积模量和线膨胀系可以精确地确定· 相似文献
87.
Analysis of transient temperature field in coke drums 总被引:1,自引:0,他引:1
One of the primary reasons leading to bulging and cracking in a coke drum is the severe temperature gradient due to cyclic temperature variation. Based on the twodimensional heat conduction theory, an analytical solution of the transient temperature field in the coke drum is obtained, which is different from the known FEM results. The length of the coke drum is considered finite. The dynamic boundary conditions caused by fluid uninterrupted rising in oiling and watering stages are simulated with the iteration method. Numerical results show that the present theoretical model can accurately describe basic features of the transient temperature field in the coke drum. Effects of the geometry of the coke drum and the rising velocity of quench water on the axial temperature gradient are also discussed. 相似文献
88.
Nonlinear stability of truncated shallow conical sandwich shell with variable thickness 总被引:2,自引:0,他引:2
IntroductionInrecentyears,withtheessentialadvantagesoflightweightandhighrigidity ,sandwichplatesandshellshavebeenusedasanimportantpatternofstructureelementsinaeronautical,astronauticalandnavalengineering .Therefore ,aconsiderableamountofresearchhasbeenco… 相似文献
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I.IntroductionPlatesandshells'consistingoflaminatedcompositematerialsareimportantstructuralmembersinmodernengineering.Thustheresearchfornonlinearproblemsoftheseplatesandshellshasbecomeincreasinglyimportantl'~II].Especially.therehasalreadybeensomeresearchworktlz--lslonthenonlinearproblemoflaminatedcircularplates.Buttheeffectsoftransversestiearonthenonlinearvibrationoftheplateshavenotbeeddiscussedbecauseofthedifficultyofnonlinearmathematics.However,itisexpectedthatthesheareffectsonlaminatedcom… 相似文献
90.
复合材料层合开顶扁球壳的非线性动态屈曲 总被引:10,自引:0,他引:10
研究了复合材料层合开顶扁球壳的非线性动态屈曲问题。建立了对称层合圆柱正交异性开顶扁球壳考虑横向剪切的非线性振动微分方程,根据突变理论建立了该壳体动态屈曲的突变模型,得到了动态屈曲的临界方程。 相似文献