Analytical solution of two intersecting cylindrical shells subjected to transverse moment on nozzle

In this paper a theoretical solution for two normally intersecting cylindrical shells subjected to transverse moment on the branch pipe is presented, which based on thin shell theory. The accurate shell equations, boundary conditions and calculating methods are adopted so that the solution presented can be applicable up to d/D⩽0.8 and λ=d/(DT)^1/2⩽8. The presented results are in very good agreement with experimental and numerical results for ORNL-1 Model. They are also in agreement with the results obtained by WRC Bulletin 297 when d/D is small.     

Dynamic stability of rotating cylindrical shells subjected to periodic axial loads

In this paper, the dynamic stability of rotating cylindrical shells under static and periodic axial forces is investigated using a combination of the Ritz method and Bolotin’s first approximation. The kernel particle estimate is employed in hybridized form with harmonic functions, to approximate the 2-D transverse displacement field. A system of Mathieu–Hill equations is obtained through the application of the Ritz energy minimization procedure. The principal instability regions are then obtained via Bolotin’s first approximation. In this formulation, both the hoop tension and Coriolis effects due to the rotation are accounted for. Various boundary conditions are considered, and the present results represent the first instance in which, the effects of boundary conditions for this class of problems, have been reported in open literature. Effects of rotational speeds on the instability regions for different modes are also examined in detail.     

Temperature stress in T-shaped intersecting cylindrical shells of constant and variable thickness

Institute of Mechanics, Academy of Sciences of the Ukrainian SSR, Kiev. Translated from Prikladnaya Mekhanika, Vol. 26, No. 12, pp. 45–53, December, 1990.     

弹性圆柱壳在轴向冲击载荷和温度耦合作用下的屈曲

通过引入哈密顿体系,将临界载荷和临界温度及它们所对应的屈曲模态归结为辛体系下的广义本征值和本征解问题。根据辛本征解的正交性和完备性,给出了全部的且独立存在的屈曲模态。数值结果表明,在轴向冲击载荷和温度耦合作用下,弹性圆柱壳的屈曲呈现出复杂的模式,温度直接影响冲击临界载荷的大小。随着温度的增加,冲击临界荷载降低,最后,文中给出各种条件下的屈曲模态。     

Stress-strain analysis of elliptic cylindrical shells under local loads

The stress-strain state of elliptic cylindrical shells under local loads is analyzed.Translated from Prikladnaya Mekhanika, Vol. 40, No. 10, pp. 113–121, October 2004.     

Expansion of cylindrical shells subjected to internal explosive detonations

Two explosively loaded cylindrical shell experiments were conducted to provide experimental data for benchmarking numerical codes. Each shell was subjected to internal high-explosive detonations, which caused it to expand outwardly at strain rates on the order of 10⁴ s^–1. At approximately 150 percent strain, multiple plastic instabilities appeared on the surface of these shells in a quasi-periodic pattem. These instabilities continued to develop into bands of localized shear and eventually formed cracks before causing the shell to fragment. Diagnostic equipment on these experiments included a Fabry-Perot interferometer and a fast-framing camera. The experiments and the data obtained from the diagnostic equipment are discussed and illustrated.     

考虑材料损伤累积单层柱面网壳在强震下的失效研究

采用考虑钢材损伤累积的本构模型,对跨度15米单层柱面网壳在强震下的失效进行了系统的研究。在大量算例的基础上,考察了屋面质量、矢跨比、初始几何缺陷和长宽比等结构几何参数的变化对柱面网壳失效特征和失效极限荷载的影响,探讨了结构的强震失效模式及失效机理。对大量强度破坏算例在失效时刻的特征响应进行统计分析,建立了考虑材料损伤累积的单层柱面网壳动力损伤模型,可对结构在不同荷载强度下的损伤程度进行评估;提出了单层柱面网壳强震失效判别准则,用于判别单层柱面网壳在强震下的失效极限荷载。     

Buckling of short viscoplastic cylindrical shells subjected to radial impulse

The dynamic buckling of thin viscoplastic cylindrical shells is considered in the formulation developed by Abrahamson and Goodier [1]. The constitutive equations employed describe the rate sensitive plastic material and a biaxial state of stress is considered. The influence of the viscosity parameter on the buckling process is discussed in detail and in the limiting case the solution for a perfectly plastic material is obtained. From the analysis of the final deflections as a function of the applied impulse the “stability effect” of the viscous properties of the material on the buckling process is determined.     

夹芯圆柱壳在水下爆炸载荷作用下的抗冲击特性

采用声固耦合方法对夹芯圆柱壳和等质量的普通圆柱壳在爆炸载荷作用下的应变、速度和加速度进行有限元计算。结果表明:夹芯防护层对爆炸冲击波可起到较好的衰减作用,即通过芯层的塑性变形,耗散了冲击过程中产生的大部分能量,对里面的圆柱壳体起到较好的保护作用,由于夹芯防护层的存在,与等质量的普通圆柱壳相比,夹芯圆柱壳能够承受更强的爆炸冲击波,降低结构的整体变形。