共查询到17条相似文献,搜索用时 62 毫秒
1.
圆柱型正交各向异性弹性楔体顶端受有集中力偶的经典解,当顶角满足一定关系时,其应力成为无穷大,这是个佯谬该文在哈密顿体系下将该问题进行重新求解,即利用极坐标各向异性弹性力学哈密顿体系,在原变量和其对偶变量组成的辛几何空间求解特殊本征值的约当型本征解,从而直接给出该佯谬问题的解析解结果再次表明经典力学中的弹性楔佯谬解对应的是哈密顿体系下辛几何的约当型解. 相似文献
2.
受r^n分布载荷的楔:佯谬的解决 总被引:2,自引:1,他引:2
对表面受与rn(n≥0)成正比的分布载荷的楔,当楔顶角2α与n之间满足一定关系时,经典解为无穷大,这是一个佯谬.本文采用复变函数方法,研究了这个佯谬的所有情形,并发现存在二次佯谬,即对某些特定的(n,α),佯谬解仍为无穷大,对此本文也予以解决 相似文献
3.
哈密顿体系与弹性楔体问题 总被引:2,自引:0,他引:2
将哈密体系引入到级坐标下的弹性力学楔体问题,利用该体系辛空间的性质,将问题化为本征值和本征向量求解上,得到了完备的解空间,从而改变了弹性力学传统的拉格朗日体系以应力函数为特征的半逆法的讨论去解决该类问题的思路,给出了一条求解该类问题的直接法。 相似文献
4.
对楔顶角为2α的圆柱型正交各向异性楔,其顶端受集中力偶的经典解当α满足tgλα=λα(λ=√(a66+2a12+2a11)/a11,a66、a12、a11为弹性常数)时,应力成为无穷大;其表面受均匀载荷的经典解当a满足sinλα=0(对称变形)或tgλα=λα(反对称变形)时,也有同样问题。这二个佯谬均由文中利用叠加齐次解的方法解决。 相似文献
5.
6.
圆柱坐标系中弹性力学的哈密顿正刚方程及其哈密顿单元… 总被引:1,自引:0,他引:1
给出圆柱坐标系中弹性力学的哈密顿形式体系,用有限元法得到了哈密顿单元的半解析解,可用于求解复合材料叠层圆柱曲板问题。 相似文献
7.
应用复变函数方法,通过构造复函数形式的特解序列,从理论上研究了顶端受集中力偶的双材料平面界面接合楔体的应力场,给出了相应的经典解,发现其存在一次和二次佯谬,相应的应力具有(Inr)/r2和(In2r)/r2的奇异性。 相似文献
8.
9.
I.IntroductionThemethodofseparationofvariablesisimportanttosolvethesoluti0n0fprobIem0fmathematicalphysics,butmanyproblen1sofmathematicalphysicscannotseparatet'ariab1es,thereforeitrestrictstheranget0appIicatemethodofseparationofvariable.Inthepaperlll,Zhong… 相似文献
10.
According to the Hellinger-Reissner variational principle and introducing proper transformation of variables , the problem on elastic wedge dissimilar materials can be led to Hamiltonian system, so the solution of the problem can be got by employing the separation of variables method and symplectic eigenfunction expansion under symplectic space, which consists of original variables and their dual variables . The eigenvalue - 1 is a special one of all symplectic eigenvalue for Hamiltonian system in polar coordinate . In general, the eigenvalue - 1 is a single eigenvalue, and the classical solution of an elastic wedge dissimilar materials subjected to a unit concentrated couple at the vertex is got directly by solving the eigenfunction vector for eigenvalue - 1. But the eigenvalue - 1 becomes a double eigenvalue when the vertex angles and modulus of the materials satisfy certain definite relationships and the classical solution for the stress distribution becomes infinite at this moment, that is, the para 相似文献
11.
黄黔 《应用数学和力学(英文版)》1986,7(2):125-137
For the problem of axisymmetrically loaded shells of revolution with small elastic strains and arbitrarily large axial deflections, this paper suggests a group of state variable: radial displacement u, axial displacement w, angular, deflection of tangent in the meridian X, radial stress resultant H and meridional bending moment Ms, and derives a System of First-order Nonlinear Differential Equations under global coordinate system with these variables. The Principle of Minimum Potential Energy for the problem is obtained by means of weighted residual method, and its Generalized Variational Principle by means of identified Lagrange multiplier method.This paper also presents a Method of Variable-characteristic Nondimensionization with a scale of load parameter, which may efficientlky raise the probability of success for nonlinearity calculation. The obtained Nondimensional System of Differential Equations and Nondimensional Principle of Minimum Potential Energy could be taken as the theoretical basis for the numerical computation of axisymmetrical shells with arbitrarily large deflections. 相似文献
12.
HAMILTONIANSYSTEMANDTHESAINTVENANTPROBLEMINELASTICITYZhongWanxie(钟万勰);XuXinsheng(徐新生);ZhangHongwu(张洪武)(ReceivedJune5,1995)Abs... 相似文献
13.
14.
15.
基于二维弹性理论, 利用Hellinger-Reissner变分原理, 通过引入对偶变量, 推导
了双参数地基上正交各向异性梁平面应力问题的辛对偶方程组; 采用分离变量法和本征展
开方法, 将原问题归结为求解零本征值本征解和非零本征值本征解, 得到了适用于任意横纵
比的梁的解析解. 由于在求解过程中不需要事先人为地选取试函数, 而是从梁的基本方程出
发, 直接利用数学方法求出问题的解, 使得问题的求解更加合理化. 其中, 地基对梁的力学
行为的影响看作是侧边边界条件, 类似于外载, 可通过零本征解的线性展开来评价, 非零本
征值本征解对应圣维南原理覆盖的部分. 还利用哈密顿变分原理, 给出了两端固支梁的
一种新的改进边界条件. 编程计算了细梁和深梁等算例, 研究了地基上梁的变形沿着厚度方
向的变化特性, 验证了辛方法的有效性. 相似文献
16.
ON THE DECOMPOSITION OF COMPLEX VECTOR SPACES AND THE JORDAN CANONICAL FORM OF COMPLEX LINEAR TRANSFORMATIONS
下载免费PDF全文

肖衡 《应用数学和力学(英文版)》1994,15(11):997-1003
ONTHEDECOMPOSITIONOFCOMPLEXVECTORSPACESANDTHEJORDANCANONICALFORMOFCOMPLEXLINEARTRANSFORMATIONSXiaoHeng(肖衡)(DepartrnenlofMaihe... 相似文献