矩形中厚板和夹层板的后屈曲

本文研究了矩形Ｒｅｉｓｓｎｅｒ中厚板和夹层板的后屈曲特性。首先将矩形中厚板和夹层板的基本方程和边界条件表述成统一的无量纲形式。对不同的边界条件，特别是不对称边界条件，文中发展了一种应用于非线性分析的混合Ｆｏｕｒｉｅｒ级数求解新方法，获得了级数形式的精确解。非线性偏微分方程化为无穷元非线性代数方程组，数值计算中截取有限项进行迭代求解。     

面内压缩载荷和横向载荷联合作用下环板的后屈曲数值分析

研究了在面内压缩载荷和横向载荷联合作用下弱性环形薄板的后屈曲问题。利用对边界条件的初始扰动及差分法直接求解非线性大挠度微分方程组，得到环板的后屈曲平衡路径。同时还给出轴缶距离缩短量与载荷的关系曲线。     

分析薄板结构后屈曲平衡路径的有限元增量渐近法

本文以 Thompson 一般稳定性理论为基础,建立了分析薄板结构后屈曲平衡路径的有限元增量渐近法的一般过程,计算了多种边界条件下矩形板的初始分支点性态及初始后屈曲平衡路径,并对薄板进行了模型试验.计算和试验结果表明,该方法具有较高的精度和较少的计算量,兼备了迭代法和渐近摄动法的优点.     

空间充气支撑管的轴压屈曲分析

将用于空间的Kapton-Al-Kapton充气展开支撑管视为圆柱薄壳,将其初始折痕、褶皱作为初始几何缺陷,采用奇异摄动法研究初始几何缺陷对屈曲荷载和后屈曲平衡路径的影响。结果表明,初始几何缺陷降低了充气支撑管的屈曲载荷,但不同的几何参数与屈曲模态下,充气支撑管对缺陷的敏感度是不同的。     

充气压力对各向同性充气管轴压稳定性的研究

采用奇异摄动法研究各向同性充气支撑管的充气压力与轴压屈曲荷载之间的关系,及其对屈曲荷载和后屈曲平衡路径的影响。结果表明,充气压力可以弥补材料的几何缺陷,明显提高充气管的屈曲载荷。该结论为充气结构在空间的应用提供依据。     

安全壳中钢衬壳热屈曲问题理论与实验研究（Ⅱ）—实验部分

钢衬壳热屈曲问题是核工程安全壳设计中的主要问题,但实验研究方面的文章发表得不多。文中以２００兆瓦核电站安全壳中钢宙为研究对象,采用局部１：１模型,测得了钢衬壳热屈曲温度和应变载荷,给出了钢衬壳屈曲和初始后屈曲过程中挠度和温度关系。     

Postbuckling behavior of rectangular moderately thick plates and sandwich plates

ＰＯＳＴＢＵＣＫＬＩＮＧＢＥＨＡＶｉＯＲＯＦＲＥＣＴＡＮＧＵＬＡＲＭＯＤＥＲＡＴＥＬＹＴＨＩＣＫＰＬＡＴＥＳＡＮＤＳＡＮＤＷＩＣＨＰＬＡＴＥＳＣｈｅｎｇＺｈｅｎ－ｑｉａｎｇ（成振强）ＷａｎｇＸｉｕ－ｘｉ（王秀喜）ＨｕａｎｇＭａｏ－ｇｕａｎｇ（黄茂光）...     

Postbuckling of a shear-deformable anisotropic laminated cylindrical shell under external pressure in thermal environments

A postbuckling analysis is presented for a shear-deformable anisotropic laminated cylindrical shell of finite length subjected to external pressure in thermal environments. The material properties are expressed as linear functions of temperature. The governing equations are based on Reddy’s higher-order shear-deformation shell theory with the von Karman-Donnell-type kinematic nonlinearity. The nonlinear prebuckling deformations and initial geometric imperfections of the shell are both taken into account. The boundary-layer theory of shell buckling, which includes the effects of nonlinear prebuckling deformations, large deflections in the postbuckling region, and the initial geometric imperfections of the shell, is extended to the case of shear-deformable anisotropic laminated cylindrical shells under lateral or hydrostatic pressure in thermal environments. The singular perturbation technique is employed to determine the interactive buckling loads and postbuckling equilibrium paths. The results obtained show that the variation in temperature, layer setting, and the geometric parameters of such shells have a significant influence on their buckling load and postbuckling behavior. Russian translation published in Mekhanika Kompozitnykh Materialov, Vol. 43, No. 6, pp. 789–822, November–December, 2007.     

复合材料层合板非线性后屈曲特性的研究

分析具有任意铺层的复合材料层合薄板在纵向压缩载荷作用下的后屈曲问题，并引用Von-Karman大挠度理论计算及几何非线性的影响，详细分析了影响简支矩形板后屈曲特性的因素。     

Postbuckling and imperfection sensitivity of fixed-end and free-end struts on elastic foundation

Summary A study of the postbuckling and imperfection sensitivity of fixed-end and free-end struts on a Winkler elastic foundation is carried out. The configuration and stability of the postbuckling paths bifurcating from the critical points are analysed. For the most part of foundation stiffness, the corresponding postbuckling paths are shown to be falling with respect to load and be unstable. This indicates that, for almost all values of foundation stiffness, the buckling loads of the struts will be sensitive to imperfections. We also obtain imperfection sensitivity of the struts with respect to geometric imperfections having the shape of buckling modes. Received 30 October 1998, accepted for publication 30 March 1999