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排序方式: 共有80条查询结果,搜索用时 31 毫秒
31.
建立了轴对称转动粘弹性不可移简支梁的几何非线性动力学模型.应用Laplace变换和摄动法分析了超静定粘弹性杆的平衡解,得到了转动粘弹性梁的预应力平凡平衡态.应用Galerkin和摄动法得到了粘弹性梁平凡解的失稳临界值,分析了梁轴向伸长对失稳临界值的影响;通过极限分析获得了系统的后屈曲稳态近似解,讨论了平凡解二次分岔后的近似稳定吸引域,并数值仿真了系统平凡解失稳后初始挠动向稳态解的演变.本文的大范围稳定性分析发现了粘弹性系统叉式分岔失稳后的平凡态又经二次鞍结点分岔而稳定以及单向跳跃(突变)等不同于弹性系统的现象. 相似文献
32.
An analytical method is suggested to analyze the plastic post-buckling behavior under impulsive loading. The fundamental equation
of motion of a cylindrical shell is taken as an example to explain the main concept and procedure. The axial and the radial
displacements are decoupled by an approximate scheme, so that only one non-linear equation for the radial buckling displacement
is to be solved. By expanding it in terms of an amplitude measure as a time variable, we may get the post-buckling behavior
in the form of a series solution. The post-buckling behavior of a rectangular plate used as a special case of cylindrical
shell is discussed. 相似文献
33.
On the basis of both the general theory [1,2] and the finite element method [4] of perforated thin plates with large deflection,the buckling and post-buckling of annular plates under non-axisymmetric plane edge forces are studied.The Project supported by the State Education Commission of the People's Republic of China 相似文献
34.
多刚体离散化方法在杆梁结构的屈曲与后屈曲分析中的应用 总被引:2,自引:0,他引:2
提出了杆梁结构的多刚体弹簧。铰链系统的离散化模型,推导了求解杆梁结构屈曲时的临界力与失稳曲线的多刚体模型的屈曲特征方程及后屈曲平衡方程。最后,给出了几个算例,并与分析解进行了比较,说明了该方法的有效性与优越性。 相似文献
35.
受圆形表面单面约束的点锚固圆环热屈曲分析 总被引:1,自引:0,他引:1
应用W.T.Koiter的初始后屈曲理论,研究了受圆形混凝土表面单面约束的点锚固圆环的热屈曲问题,根据混凝土容器壁的几何约束条件,假设了圆环的合理屈曲模状,得出了圆环在两锚固点之间发生屈曲的临界温度,并研究了其后屈曲性态和缺陷敏感性。结果表明,临界点和后屈曲路径的平衡均为稳定的,圆环对于与屈曲模态形状相同的缺陷是不敏感的。 相似文献
36.
37.
Giles Hunt 《Nonlinear dynamics》2006,43(1-2):29-46
A personal overview of the buckling process is given, based on more than 30 years research experience. A fundamental distinction
is drawn between structures that tend to distribute their pattern of buckling over the entire available length, and those
that favour limiting it to a localized portion. Difficulties are compounded by the fact that localized solutions typically
are shadowed by distributed counterparts. The difference is found to depend primarily on the stability of the system at the
point of buckling. When an unstable localized form shows a tendency to restabilize, a pattern known as cellular buckling can
develop, taking place sequentially in both space and time. The paper focuses particularly on the buckling of the axially-compressed
cylindrical shell, and shows how the circumferential periodicity coupled with axial localization has special but hidden characteristics.
In particular, the circumferential wavenumber is picked at an early stage of buckling and remains locked, while localization
in the axial sense permits extensive change to the post-buckling shape. 相似文献
38.
Using W. T. Koiter's initial post-buckling theory, this paper deals with the critical load and post-buckling behavior of a point-supported cylindrical liner shell encased in a concrete pressure vessel while the liner shell is subjected to axial and lateral compressions. The reasonable spacing of anchors is given. The results show that the point-supported cylindrical liner shell has a relatively complicated post-buckling behavior. The behavior is subject to the change of anchor spacing in both axial and circumferential directions. When the ratio of the anchor spacing in the two directions satisfies a certain condition, the liner shell will carry the maximum load. 相似文献
39.
为了有效完成大型铰接单层网壳结构的后屈曲分析,本文采用对杆单元杆端力函数求导的方法推导出了等直杆单元切线刚度矩阵的精确形式。该切线刚度矩阵不受结构小变形限制,适用于结构产生任意大结点位移情况。以六角星桁架、平面圆拱桁架和大跨K8单层网壳结构为算例,采用广义位移控制法进行非线性后屈曲分析,其中预测子采用本文杆单元切线刚度矩阵。算例分析结果表明,本文杆单元切线刚度矩阵在大型铰接单层网壳结构的非线性后屈曲分析中有很强的预测能力。 相似文献
40.