The bending,stability and vibrations of rectangular plates with free edges on elastic foundations

This paper discusses the problems of the bending, stability and vibrations of the rectangular plates with free boundaries on elastic foundations. In the present paper we select a flexural function, which satisfies not only all the boundary conditions of free edges but also the conditions at free corner points, and consequently we obtain a better approximate solution. The energy method is used in this paper.     

弹性地基上自由边矩形板的弯曲、稳定和振动

本文讨论了在弹性地基上自由边矩形板的弯曲、稳定和振动的问题.本文选择了一个挠曲函数,它不但能满足自由边的全部边界条件,而且也满足了自由角点的条件,从而得到了较好的近似解,文中使用了能量法.     

The dynamic computation of closed cylindrical shell under impact load

This article discusses the dynamic computation of the closed cylindrical shell under impact load. In the text we analyse the changes of the momenta and the energy on each stage in the impact process, take into account the effect of the mass of impact object and the system of the closed cylindrical shell by impact, and transform the distributed mass of the whole cylindrical shell into an only concentrated equivalent mass by the method of reduced mass. Consequently we derive the dynamic factor of the closed cylindrical shell due to impact load. The method proposed in this paper is of practical worth and is more convenient in calculations.     

快速傅里叶变换的并行计算

本文是"快速傅里叶变换向量化程序包"研制工作的部分内容,主要介绍一维、二维复数据快速傅里叶变換的并行计算方法及其计算效率。在银河机(YH—1)上的计算实践表明,向量运算比相应的标量运算,平均可提高功效数十倍。     

On some problems in dynamic computation for thin-walled structures

This article discusses the problems of the dynamic computation for thin-walled structures such as thin plates and thin shells under impact load to find the dynamic factor mainly. In calculation we take into account the effect of the mass of the striking object and the system of thin-walled structures to be struck and transform the distributed mass of thin-walled structures into only one concentrated equivalent mass by the method of reduced mass. Accordingly we derive the dynamic factor for the system of thin-walled structures under impact load.     

On some problems of plastic buckling of plates and shells

This paper gives the stress-strain relations of the variational types on the basis of an assumption concerning the small deformation in the theory of elasto-plasticity.The compact form of fundamental equations of plastic buckling of the plates and shells is obtained in terms of secant modulus.     

板壳塑性屈曲中某些问题

本文应用弹塑性小变形的假定,将应力与应变的关系都用变分形式相联系.简洁地导出板壳塑性屈曲的基本方程,并引入割线模量,计算较方便.     

Forced vibrations of elastic shallow shell due to the moving mass

This paper discusses the forced vibrations of the elastic shallow shell due to the moving mass by means of the variational method. In the text mentioned above a series of problems such as the forced vibrations, resonance conditions and critical speed and so forth.     

四苯醚砜双炔聚合过程及其聚合物的动态力学行为研究

本文用扭辫分析(TBA)和红外光谱研究了双[4-(4-乙炔基苯氧基)苯基]砜(简称四苯醚砜双炔)及其聚合物的动态力学行为.TBA热谱的结果可以明显地表征四苯醚砜双炔的熔融及其低温区和高温区的化学反应特征,以及其聚合物的玻璃化转变和分解反应等物理-化学转变行为.实验表明四苯醚砜双炔聚合物的玻璃化温度T_g极大地取决于聚合条件.