分解刚度法在各向异性多层扁壳理论中的应用

本文按文献[3]中胡海昌阐述的方法,在文献[1]的基础上,将分解刚度法推广应用到各向异性多层扁壳的横向变形、稳定和横向振动问题上去,取得了简单实用、计算工作量和误差都较小的近似计算方法.     

The finite deflection equations of anisotropic laminated shallow shells

In this paper, basing on ref. [1] we improved and extended that which is concerned with a view of investigating the finite deflection equations of anisotropic laminated shallow shells subjected to static loads, dynamic loads and thermal loads. We have considered the most general bending-stretching couplings and the shear deformations in the thickness direction, and derived the equilibrium equations, boundary conditions and initial conditions. The differential equations expressed in terms of generalized displacements u₀, ₀ and are obtained. From them, we could solve the problems of stress analysis, deformation, stability and vibration. For some commonly encountered cases, we derived the simplified equations and methods.     

THE FINITE DEFLECTION EQUATIONS OF ANISOTROPIC LAMINATED SHALLOW SHELLS

In this paper,basing on ref.[1]we improved andextended that Which is concerned with a view of inves-tigating the finite deflection equations of anisotro-pic laminated shallow shells subjected to static loads,dynamic loads and thermal loads.We have consideredthe most general bending-stretching couplings and theshear deformations in the thickness direction.and de-rived the equilibrium equations,boundary conditionsand initial conditions.The differential equationsexpressed in terms of generalized displacements u_o,υ_o,φ_x, φ_y and w are obtained.From them,we could solvethe problems of stress analysis,deformation,stabilityand vibration.For some commonly encountered cases,we derived the simplified equations and methods.     

第二届全国复合材料学术会议

由中国力学学会、中国航空学会和中国宇航学会联合举办的第二届全国复合材料学术会议于1982年8月18日至22日在哈尔滨召开。与会代表共计265名,收到论文报告230篇。会议分四个专题组宣读论文。四个专题组是:树脂基复合材料与工艺;板壳与优化设计;断裂疲劳性 ...     

复合材料的多层、夹层和加筋圆柱曲板的稳定和振动

本文在文献〔1,2〕的基础上,考虑了沿壳体厚度方向的剪切变形,探讨周边简支的纤维增强复合材料的正交各向异性的多层、夹层和加筋矩形圆柱曲板(与圆柱壳),在轴压、侧压和剪切(扭矩)作用下的临界载荷和横向振动固有频率的计算问题。在编成计算程序后,用一些算例将用文献〔1〕中的扁壳方程(Donnell壳体理论) 和文献〔3〕中的非扁壳方程(Love的壳体一阶近似理论) 算得的结果作了比较;将轴压下轴对称失稳和非轴对称失稳的临界载荷作了比较;将在轴压和侧压作用下失稳时外加筋曲板和内加筋曲板的临界载荷作了比较;将有薄膜力N_x~0和N_y~0同时和分别作用时与没有薄膜力作用时的横向振动固有频率作了比较;将按壳体的剪切变形理论和经典理论算得的临界载荷作了比较;将铺层情况对临界载荷的影响作了比较。     

Creep buckling of cross-ply symmetric laminated cylindrical panels

A creep buckling analysis of cross-ply symmetric laminated cylindrical panels is given in this paper.By means of theoretical analysis,a method to determine the critical load of creep buckling of the panels with simply supported boundary conditons is obtained.     

复合材料及其结构的非线性力学问题

本文根据最近文献及新近进展,讨论了复合材料及其结构的非线性力学问题,这是一个在实用上和理论上很重要并且越来越重要的问题。      

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 orthotropic surfaces. The critical point is determined and the postbuckling behaviour of the panel is studied.     

用数学弹性力学的方法研究弹性体的稳定问题

用数学弹性力学的方法研究弹性体的稳定问题,是一个重要而困难的课题.B.B.Hовожилов在文献[1]中给出了平衡方程和边界条件,由于数学上的困难,没有给出具体问题的解.A.Ю.Ишлынский[2]用数学弹性力学的方法解决了两边简支的无限宽平板当两边均匀受压时,在平面应变条件下的弹性稳定问题.他说:“从Hовожилов方程的观点看来,我们在平衡方程中忽略了转动分量,同时在边界条件中保存了转动的因素”,以克服数学上的困难.由于引入了一些简化带来了一些误差,他所得的临界载荷略微高于经典理论给出的临界载荷.К.ф.Войцеховская[3,4]采用Ишлынский的方法,获得了两端简支的圆杆和圆柱壳在轴压作用下的临界载荷,也略微高于经典理论给出的临界载荷.从弹性理论的观点看来,他们的结果是不够严格的.本文采用Hовожилов的平衡方程和边界条件,采用胡海昌[6]的位移函数用以简化微分方程组,克服了数学上的困难,解得了[2-4]中求解过的几个稳定问题,得到的临界载荷略微低于经典理论给出的临界载荷.从数学弹性力学的观点看来,它是严格的.     

有关大型油罐设计的若干设想

在毛主席的无产阶级革命路线指引下,在党的正确领导下,我国石油工业有了很大的发展,具有重大的政治和经济意义。大型油罐的设计制造工作,在有关方面努力下,进展很快,已建成一大批一万、二万米~3的油罐,五万米~3的浮顶式油罐电已投产。为了适应石油工业更大的发展,需要研制10万、20万米~3。或更大的油罐,这是发展的趋势。在大型油罐的设计制造中,涉及到很多问题,如用钢的规格和数量、工艺情况、施