INCREMENTAL VIRTUAL WORK EQUATION FOR GEOMETRIC NONLINEAR ANALYSIS

In this paper,an incremental virtual work equation is derived.It is suitable forgeometric nonlinear analysis in finite element method.The effect of truncation errors isconsidered in the incremental virtual work equation.     

Large deflection problem of thin orthotropic circular plate with variable thickness under uniform pressure

Basic equations for large deflection theory of thin orthotropic circular plate with variable thickness are derived in this paper. The modified iteration method is adopted to solve the large deflection problem of thin orthotropic circular plate with variable thickness under uniform pressure. If ε=0, then the solution derived from the result in this paper coincides completely with the result given by J. Nowinski (using perturbation method) for solving large deflection problem of thin orthotropic circular plate with constant thickness under uniform pressure.     

NONLINEAR STABILITY ANALYSIS OF A SANDWICH SHALLOW CYLINDRICAL PANEL WITH ORTHOTROPIC SURFACES

In this paper,the large deflection theory is adopted to analyse the geometrical nonlinear stability of a sandwich shallow cylindrical panel with orthoiropic surfaces.The critical point is determined and the postbuckling behaviour of the panel is studied.     

自平衡端头载荷问题衰减率的分析与计算

给出了自平衡端头载荷问题应力衰减率分析的一种方法．用边界单元法求得了在端面自平衡载荷作用下，具有椭圆截面和矩形截面的弹性柱体内应力场的最小衰减率。计算结果表明：当椭圆截面的长短轴之比和矩形截面的长宽之比变化时，最小衰减率变化很小．     

均布载荷下正交异性变厚度圆薄板大挠度问题

本文导出了正交各向异性变厚度圆薄板大挠度问题的基本方程,用修正迭代法求解了正交各向异性变厚度圆薄板在均布载荷下的大挠度问题.作为特例,令ε=0,则由本文结果得到的表达式与J.Nowinski用摄动法得到的正交各向异性等厚度圆薄板大挠度问题的解完全一致.     

THE INVERSION OF CIRCULANT MATRIX

The method of inverting the circulant matrix and the expression of inversion of the circulant matrix are obtained in this paper.     

Incremental virtual work equation for geometric nonlinear analysis

In this paper, an incremental virtual work equation is derived. It is suitable for geometric nonlinear analysis in finite element method. The effect of truncation errors is considered in the incremental virtual work equation.     

松质骨的细观力学研究评述

用细观力学方法分析松质骨的力学性能，研究松质骨的弹性模量、压缩强度与其相对密度之间的关系，这是骨力学的一个重要研究方向．     

LARGE DEFLECTION PROBLEM OF THIN ORTHOTROPIC CIRCULAR PLATE WITH VARIABLE THICKNESS UNDER UNIFORM PRESSURE

Basic equations for large deflection theory of thin orthotropic circular plate withvariable thickness are derived in this paper.The modified iteration method is adopted tosolve the large deflection problem of thin orthotropic circular plate with variable thicknessunder uniform pressure.Ifε=0 ,then the solution derived from the result in this papercoincides completely with the result given by J.Nowinski(using perturbation method)forsolving large deflection problem of thin orthotropic circular plate with constant thicknessunder uniform pressure.