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Under uniaxial pressure, piezolectric effect and external voltage can hardly affect buckling and post-buckling charact eristic of piezoelectric-plate.

计算结果表明,在单向压力作用下,材料的压电效应和外加电压对板的屈曲载荷及后屈曲影响很小;而电场对位移加载简支板的屈曲影响较显著。

In chapter 2, a finite element model for the composite sandwich plates is developed, based on the Zig-Zag deformation assumption and the first order shear deformation theory, and the finite element buckling analysis governing equations for the plates under mechanical, thermal and/or thermal-mechanical mixed loads are deduced respectively. By Von-Karman nonlinear deformation relations and Total Lagrange formulation, an incremental governing equation for postbuckling analysis is established and a corresponding effective computational scheme is presented..

第二章首先建立了基于Zig-Zag截面变形假定和Mindlin一阶剪切理论的夹层板有限元分析模型,分别推导了夹层板机械力、热载和热—机械力耦合屈曲分析的有限元列式和相应的屈曲前以及屈曲临界状态的平衡方程,基于Von-Karman大挠度理论,采用增量形式的全局lagrangian法推导了复合材料夹层板增量形式的几何非线性有限元离散平衡方程,给出了一种有效的非线性平衡方程的迭代求解格式。

Based on the magnetic-elasticity nonlinear kinetic equations, physical equations, electrical kinetic equations and the expression of Lorentz forces, the magnetic-elasticity kinetic buckling equation of a current-carrying plate applied mechanical load in a magnet field were derived. The equation was transformed into the standard Mathieu equation by using Galerkin method. Thus, the magnetic-elasticity kinetic problem was changed into a problem of solving the Mathieu equation.

在载流薄板的磁弹性非线性运动方程、物理方程、洛仑兹力表达式及电动力学方程的基础上,导出了载流薄板磁弹性动力屈曲方程,并应用Galerkin原理把屈曲方程整理为Mathieu方程的标准形式,将载流矩形薄板在电磁场与机械荷载共同作用下的磁弹性屈曲问题归结为对Mathieu方程的求解问题。

Based on the magneticelasticity nonlinear kinetic equations, physical equations, electrical kinetic equations and the expression of Lorentz forces, the magneticelasticity kinetic buckling equation of a currentcarrying plate applied mechanical load in a magnet field were derived. The equation was transformed into the standard Mathieu equation by using Galerkin method. Thus, the magneticelasticity kinetic problem was changed into a problem of solving the Mathieu equation.

在载流薄板的磁弹性非线性运动方程、物理方程、洛仑兹力表达式及电动力学方程的基础上,导出了载流薄板磁弹性动力屈曲方程,并应用Galerkin原理把屈曲方程整理为Mathieu方程的标准形式,将载流矩形薄板在电磁场与机械荷载共同作用下的磁弹性屈曲问题归结为对Mathieu方程的求解问题。

On the basis of this , the paper makes a great deal of calculation and analysis in this part , different parameters effect and stress gradient are included . local buckling coefficient and the efficient width calculated formula are provided and look forward to take a reference to the redaction of the specification

本文对此内容进行了较为深入的研究,考虑了多个参数的影响,对各种应力比作用下的楔形腹板的屈曲及屈曲后强度进行了计算分析,得出了考虑翼缘相关作用的楔形腹板屈曲系数及有效宽度系数的计算公式,以期为规范的修订提供参考。

I learned a lot of thing on the conference, such as used in steel buckling analysis marco element theory, named GBT, it can predict the global buckling modal including local buckling modal, it's amazing. then, I meet a professor form Roumania, He also have some researches on marco element, we talk a lot.

会议上学到了很多东西,也认识了一些牛人,从报告中发现,宏观单元不但是混凝土中用了,在分析钢结构的屈曲问题也用到,如GBT单元,可以通过截面屈曲模态去计算整体屈曲变形,简直是神乎奇技,认识了罗马尼亚的教授,也是搞宏观单元编程的,谈了很多。

Aiming at the problem of buckling stability capability of box section hoist boom of wheel crane, a complete section of hoist boom is taken as analysis object and buckling instability of the webs is analyzed and researched with the booms of different sectional shapes by applying finite element analysis method. Compared with crane design code (GB3811-83), one piece of plate is taken to calculate buckling stability, the method is easier and more accurate and calculation and analysis of complicated sectional shapes are easy to conduct.

针对轮式起重机箱型起重臂的抗屈曲失稳能力问题,采用有限元分析方法,取起重臂截面半波长段作为分析对象,对相同工况不同截面形状的起重臂的屈曲失稳情况进行分析研究,相对于起重机设计规范(GB3811-83)给出的取一块板进行屈曲计算要快捷、准确得多,而且也容易完成对复杂形状截面的计算分析。

Impact buckling which has few study findings relatively. So some viewpoints have not been consistent. Systematic study is made on dynamic buckling of axial compression member under impact load in this paper for that reasons.

动力屈曲问题由于时间参数的引入相比静力屈曲问题要复杂得多,特别是对冲击荷载作用下的动力屈曲问题尤甚,研究成果相对较少,对许多问题的认识尚未达成一致。

To get the buckling deformation,configuration and restraint forces of tubular strings sealed in packers,the buckling behavior of tubing neared parkers was analyzed in this paper.

目前的封隔器管柱屈曲分析没有考虑靠近封隔器段非螺旋屈曲段管柱,没有给出非螺旋屈曲段管柱的变形表达式和封隔器对管柱的约束载荷。

In this paper we analyzed the mechanism of straight-sided bulking and the propagation of bulking driven delamintaion. Conditions for steady-state growth of buckling-driven delamination in thin film systems can be calculated by a simplified method where details around the growing front are not required.

本文定性分析了皱折屈曲传播的机理,进行了屈曲分层的数学分析:薄膜中屈曲分层的稳定增长条件,可以用一个简单的方法计算得来,前提条件是增长的前端部分不做要求。

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