共查询到18条相似文献，搜索用时 578 毫秒
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Zhou Chengti Wang Liedong 《大连大学学报》1993,(1)
本文用汉密尔顿原理导出了复合材料叠层圆柱壳的非线性动力稳定性的控制微分方程。在基本方程中包括了非线性大挠度、圆柱壳的初始几何缺陷,以及动力载荷的惯性力等因素的影响。本文的目的是分析复合材料圆柱壳的参数共振和确定壳体结构动力屈曲时的稳定性区域和不稳定性区域,作为求解的例题,本文对三种复合材料圆柱壳进行了数例计算:即 T300—5208石墨-环氧壳体,ARALL 叠层铝合金壳体,和 E-玻璃-环氧壳体,结果表明它们具有相当不同的动力稳定性能.由本文所得出的计算结果和分析结论对于考虑和设计复合材料圆柱壳的动力稳定性具有重要的实用意义. 相似文献
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沈明秀 《昆明师范高等专科学校学报》2008,30(4):90-92
利用有限元分析软件ANSYS中优化分析模块,对潜艇后段壳体的关键尺寸进行优化．在满足强度、刚度、稳定性和工艺等条件下,以减少其变形量及体积,使壳体的各项性能得以提高．通过有限元分析给出圆柱壳体的变形和应力分布图,从应力分布图中可以明显的看到设计中较弱的部位以及传力不好的部位,设计人员可对应力分布图中显示较弱的部位进行局部加强或使结构受力更为合理． 相似文献
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林雁 《赤峰学院学报(自然科学版)》2012,(13):73-75
为了进一步了解框架-剪力墙结构在地震作用下的动力特性,本文在对框架-剪力墙结构线性抗震分析的基础上,进一步考虑了结构中的非线性理论,强调框架-剪力墙结构的非线性抗震性.本文采用的分析软件是有限元分析软件ANSYS,用软件对框架-剪力墙结构进行非线性的抗震分析,得出了结构在大震作用下结构的变形和内力.分析结果表明,此结构在大震作用下整体稳定性较好,只有局部构件发生塑性变形,不影响结构的安全性. 相似文献
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张燕 《西安文理学院学报》2019,(1)
三支点前置电动叉车是当今一种重要的物流工具,轮边减速器是电动叉车的重要动力单元,轮边减速器的壳体作为其关键部件,承受较大的外载荷,壳体极易随着载荷的作用而发生变形,从而导致零件的报废,降低整台机器的使用年限.设计人员在设计轮边减速器壳体的时候,首先通过Pro/E建立壳体的三维模型,然后将三维模型导入有限元分析软件ANSYS中,结合牛顿-拉普森迭代法对壳体进行静态接触分析,从而预测设计存在的缺陷,提出相应的优化改进对策,通过多次仿真优化,使得壳体符合使用要求.通过有限元分析,既缩短了减速器壳体的设计周期,又降低了生产成本. 相似文献
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计小辈 《邢台职业技术学院学报》2013,(5):71-73
金属塑性变形过程中的应力-应变关系是结构非线性问题,其对塑性成形制件的质量有很大影响.本文借助于有限元塑性变形分析理论和有限元分析软件ANSYS,直观地解决了金属塑性变形过程中的应力—应变问题,为实际生产过程提供了理论依据. 相似文献
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Zhou Chengti 《大连大学学报》1992,(1)
本文运用柯依脱理论(Koiter'sTheory)对于复合材料圆柱壳屈曲性能的初始缺陷影响进行了一般性分析,为复合材料壳体的初始缺陷敏感度分析建立了基本控制方程;壳体的初始缺陷被设定为具有某些固定形式的或者是随机形式的,为了讨论和比较各种复合材料叠层壳体的缺陷敏感度的影响,用数值算例计算了由玻璃/环氧,硼/环氧,和炭/环氧等复合材料所组成的圆柱壳体的届曲性能。 相似文献
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四驱汽车主减速器壳体有限元分析 总被引：1，自引：0，他引：1
赵全全 《赤峰学院学报(自然科学版)》2014,(8):10-12
主减速器是驱动桥的重要组成部件之一,其主要功用是将发动机输入的转矩增大并相应的降低转矩,在发动机纵置时还具有改变转矩方向的作用[1].本文利用UG软件建立目标主减速器壳体的实体三维模型,然后运用ANSYS Workbench12对该模型进行网格划分并对其进行不同工况下的加载并求解,最后得出分析结果,以期为主减速器壳体使用性能的优化提供一定的理论参考. 相似文献
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The effect of axial shallow groove on the nonlinear dynamic response and buckling of laminated cylindrical shells subjected to radial compression loading was investigated. Based on the first-order shear deformation theory （FSDT）, the nonlinear dynamic equations involving the transverse shear deformation and initial geometric imperfections were derived with the Hamilton philosophy. The axial shallow groove of the laminated composite cylindrical shell was treated as the initial geometric imperfections in the dynamic equations. A semi-analytical method of expanding displacements and loads along the circumferential direction and employing the finite difference method along the axial direction and in the time domain is used to solve the governing equations and obtain the dynamic response of the laminated shell. The B-R criterion was employed to determine the critical loads of dynamic buckling of the shell. The effects of the parameters of the shallow groove on the dynamic response and buckling were discussed in this paper and the results show that the axial shallow grooves greatly affect the dynamic response and buckling. 相似文献
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叶志明 《上海大学学报(英文版)》1997,1(2):105-111
NomenclaturelintroductionWiththerapiddevelopmelltinshellanalysis,flexibleshellshavefoundWiderapplicationsinengineering.Muchattentionisculal.entlyfoctlsedonthenonlinearbendingandstabilityproblemsofthoseshells.Thebehaviorofflexibleshellsisgovernedbynonlinea… 相似文献
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SUNG Wen-pei GO Cheer-germ SHIH Ming-hsiang 《浙江大学学报(A卷英文版)》2007,8(9):1373-1379
The characteristic properties of shell element with similar shapes are used to generate a so-called super element for the analysis of the crack problems for cylindrical pressure vessels. The formulation is processed by matrix condensation without the involvement of special treatment. This method can deal with various singularity problems and it also presents excellent results to crack problems for cylindrical shell. Especially,the knowledge of the kind of singular order is not necessary in super element generation; it is very economical in terms of computer memory and programming. This method also exhibits versatility to solve the problem of kinked crack at cylindrical shell. 相似文献
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This paper is concerned with the free vibration analysis of open circular cylindrical shells with either the two straight edges or the two curved edges simply supported and the remaining two edges supported by arbitrary classical boundary conditions. Based on the Donnell-Mushtari-Vlasov thin shell theory, an analytical solution of the traveling wave form along the simply supported edges and the modal wave form along the remaining two edges is obtained. With such a unidirectional traveling wave form solution, the method of the reverberation-ray matrix is introduced to derive the equation of natural frequencies of the shell with different classical boundary conditions. The exact solutions for natural frequencies of the open circular cylindrical shell are obtained with the employment of a golden section search algorithm. The calculation results are compared with those obtained by the finite element method and the methods in the available literature. The influence of length, thickness, radius, included angle, and the boundary conditions of the open circular cylindrical shell on the natural frequencies is investigated. The exact calculation results can be used as benchmark values for researchers to check their numerical methods and for engineers to design structures with thin shell components. 相似文献
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Zhou Cheng-ti 《大连大学学报》1991,(1)
本文论述了复合材料的强度和稳定性理论中的三个近代问题:复合材料迭层板的强度准则,多层复合材料圆柱壳的非线性稳定性理论,以及复合材料板的动力稳定性理论。关于迭层板的强度准则,论述了目前以张量多项式形式所表述的唯象性破坏准则,着重讨论和比较了各种近代理论在确定耦合系数方面的特点和差别。提出了近代理论中所存在的困难和发展趋势。在多层复合材料圆柱壳的非线性稳定性理论分析中,主要的问题在于如何研究和考虑那些非线性因素,诸如由材料的剪切模量所引起的物理非线性,横向剪切变形的影响,壳体结构的初始缺陷和几何非线性,以及前屈曲变形和边界支承条件的影响等。本文指出了考虑这些因素的方法以及它们的影响程度。复合材料板的动力屈曲性能研究是一个重要的近代研究方向。本文提出了关于复合材料本身的阻尼系数,纵向和转动惯性力影响,横向剪切效应,迭层板的初始几何缺陷,以及增强纤维的铺设方向等因素对于动力屈曲性能的影响。同时提出了计算这些影响的方法,指出这些因素在复合材料板的动力稳定性分析中有着重要作用。 相似文献
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INTRODUCTION Vibrations of cylindrical shells are of consider-able importance as they are extensively used in in-dustry,flight structures and marine crafts.The naturalfrequencies and mode shapes are important sources ofinformation for understanding and controlling thevibration of these structures,so many papers on theprediction of the natural frequencies of cylindricalshells have been published over the past years.Many shell theories have been developed andvarious solution methods have bee… 相似文献
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The effect of weld reinforcement on axial plastic buckling of welded steel cylindrical shells is investigated through experimental
and numerical buckling analysis using six welded steel cylindrical shell specimens. The relationship between the amplitude
of weld reinforcement and the axial plastic buckling critical load is explored. The effect of the material yield strength
and the number of circumferential welds on the axial plastic buckling is studied. Results show that circumferential weld reinforcement
represents a severe imperfect form of axially compressed welded steel cylindrical shells and the axial plastic buckling critical
load decreases with the increment of the mean amplitude of circumferential weld reinforcement. The material yield strength
and the number of circumferential welds are found to have no significant effect on buckling waveforms; however, the axial
plastic buckling critical load can be decreased to some extent with the increase of the number of circumferential welds. 相似文献
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利用有限元分析软件ANSYS Workbench对某内压筒体沿周向开设矩形排孔的结构进行有限元分析,得到该结构的应力分布状况和最高应力水平,并据标准对此结构进行了强度评定。分析结果表明,沿筒体轴向因开孔致应力集中的影响范围较小,而周向各接管开孔应力集中的影响互相叠加,其范围遍布筒体的整个周向,最大应力分布在各接管拐角和各接管与筒体的角焊缝处,故矩形接管的焊缝应全焊透且需进行表面渗透检测,以满足JB4730I级合格标准,并避免安排在拐角处。 相似文献