固支矩形底扁球壳的边界几何缺陷     

蔡松柏  王选民 《湖南农业大学学报(自然科学版)》1991,18(3)

In this paper, concept of boundary geometrical imperfection during postbuckling process for shallow spherical shell is first presented. The effects of the declination of the rectangular boundary on postbuckling process are also studied by integrated metho  相似文献   

卷边板件屈曲分析的半能量法     

周绪江  王世纪 《湖南农业大学学报(自然科学版)》1991,18(2)

A semi-energy method to analyse the buckling behaviour of edge-stiffened plates under combined compression and bending is presented in this paper, One unloaded edge of the plate is restrained elastically against rotation and the other is stiffened by a st  相似文献   

两端不等弯矩作用下薄壁梁柱的弯扭屈曲     

周绪红  王世纪 《湖南农业大学学报(自然科学版)》1993,20(5)

本文采用Ｒａｙｌｅｉｇｈ－Ｒｉｔｚ法求解两端不等弯矩作用下单轴对称开口薄壁截面梁柱弯扭屈曲临界荷载，分析中考虑了三种常见的边界条件以及屈曲前变形的影响，将本文弯扭屈由临界荷载理论值与试验值比较，吻合较好。  相似文献   

开口薄壁结构弯扭屈曲能量原理的有限变形理论分析     

舒兴平  王世纪 《湖南农业大学学报(自然科学版)》1991,18(3)

The formulas of the total potential energy of arbitrary thin- walled open cross section member counting in the geometric non-linear factors is deduced. The deductions are based on the most general finite deformation theory and the two assumptions that"the  相似文献   

Discussion on Second-order Analysis of Variable-Section Beam-Column     

XIONG Xiao-li  LI kai-xi 《保鲜与加工》2004,(2):36-40

In this paper, based on the discussion of orthogonal decomposition method for the buckling mode of unsymmetrical structure, taking the variable-section beam-column as an example, a simple and direct method of the second order analysis is presented. In the new method, the conception of enlargement coefficient brought forward by Timoshenko is developed. To begin with the curvature of the variable-section beam-column, the linear equations are set up. With their solution, a group of orthogonal buckling mode can be obtained. The primary deflection can be decomposed to a group of homomorphic deflection similar to buckling mode. Then, the group of deflection is multiplied by corresponding enlargement coefficient and plus the result, finally, the second-order total deflection can be obtained.  相似文献   

Effects of Stitcing on the Buckling Strength of Stitched Composite Laminates     

WEI Yu-qing~  CHEN Bin~ 《保鲜与加工》2004,(7):24-27

A theoretic model is proposed based on the mechanism of the buckling failure of the stitched composite laminates containing delaminations. The buckling strength of the stitched composite laminates under the in-plane compressive load is predicted. The critical percentage elongation of the stitching thread is taken into account as a control parameter of the buckling failure. The energy method is used to calculate the buckling strength of the stitched composite laminates, and the minimal potential energy is used to calculate that of the unstitched composite laminates. The result shows that the buckling strength of the stitched composite laminates is larger than that of the unstitched composite laminates. The effects of stitching technical parameters such as the stitch thread diameter, stitch step and stitch space on the stitched composite laminates are also analyzed.  相似文献   

具脱层的正交各向异性梁-板的屈曲分析     

张运良  傅衣铭 《湖南农业大学学报(自然科学版)》2000,27(1)

根据非线性理论，假定脱层为贯穿梁幅的一维脱层，且脱层位置任意，建立了轴向压力作用下含脱层的正交各向异性梁－板的非线性控制方程，对结构进行了分区处理，通过使控制方程适当线性化，利用脱层前缘的连续性条件、平衡条件及相容条件，导出了夹支边界情况下的具脱层的正交各向异性梁－板关于屈曲荷载的无量纲化的特征方程，确定了临界压力荷载，并讨论了脱层尺寸及位置对临界荷载的影响。  相似文献   

复杂荷载作用下单轴对称开口薄壁梁柱的弯扭屈曲     

周绪红  周期石 《湖南农业大学学报(自然科学版)》2002,29(6)

采用Rayleigh-Ritz法求解两端等弯矩、横向集中荷载和均布荷载作用下单轴对称开口薄壁截面梁柱弯扭屈曲临界荷载。分析中考虑了3种常见边界条件以及屈曲前变形的影响。将本文弯扭屈曲临界荷载理论值与试验值比较，吻合较好。  相似文献   

基于柱体屈曲理论的树高曲线式和材积式   总被引：4，自引：0，他引：4  

郑小贤  刘东兰 《北京林业大学学报》1997,19(1):89-92

基于柱体屈曲理论推导出树高曲线式和材积式，应用于樟子松人工林效果良好．与传统方法比较，其有精度高、应用性强的优点  相似文献   

纤维缠绕圆柱壳轴对称分叉屈曲     

杨佑发  钟正华 《湖南农业大学学报(自然科学版)》1996,23(5)

讨论了多层复合材料圆柱壳在轴向压缩载荷的条件下的对称分叉屈曲。基于Ｄｏｎｎｅｌｌ方程，将位移法与复数解法推广应用于纤维缠绕圆柱壳的稳定性问题。提出了壳体在轴向压缩下的轴对称屈曲模态以及临界载荷的算法，特别着重考虑了各类边界条件与耦合效应。其理论和结果可直接应用于固体火箭发动机壳体的结构设计。  相似文献