共查询到20条相似文献,搜索用时 31 毫秒
1.
Lugovyi P. Z. Gaidaichuk V. V. Skosarenko Yu. V. Kotenko K. E. 《International Applied Mechanics》2021,57(4):395-404
International Applied Mechanics - The stress–strain state of symmetric three-layer cylindrical shells under nonstationary loads is considered. The equation of vibrations of a shell with a... 相似文献
2.
International Applied Mechanics - The stress–strain state of asymmetric three-layer cylindrical shells under nonstationary loads is considered. The sandwich structure is asymmetric due to the... 相似文献
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The equations of nonaxisymmetric vibrations of sandwich cylindrical shells with discrete core under nonstationary loading are presented. The components of the elastic structure are analyzed using a refined Timoshenko theory of shells and rods. The numerical method used to solve the dynamic equations is based on the integro-interpolation method of constructing finite-difference schemes for equations with discontinuous coefficients. The dynamic problem for a sandwich cylindrical shell under distributed nonstationary loading is solved with regard for the discreteness of the core__________Translated from Prikladnaya Mekhanika, Vol. 41, No. 2, pp. 60–67, February 2005. 相似文献
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The equations of nonaxisymmetric vibrations of discretely reinforced multilayer cylindrical shells are analyzed. A refined Timoshenko model of shells and beams is used to analyze elements of an elastic structure. The vibration equations for an inhomogeneous elastic system are derived using the Reissner variational principle. The numerical solver of the dynamic equations is based on the integro-interpolation method used to construct finite-difference schemes for equations with discontinuous coefficients. The dynamic behavior of a five-layer cylindrical shell under distributed nonstationary loading is analyzed 相似文献
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International Applied Mechanics - The forced vibrations of discretely reinforced multilayer cylindrical, spherical, and conical shells under nonstationary loading are studied. The dynamic behavior... 相似文献
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The elastoviscoplastic behavior of a discretely reinforced shell under axisymmetric nonstationary loading is considered within the framework of the geometrically and physically nonlinear Timoshenko-type theory of shells. The stress–strain state of the structure is studied in terms of the incremental plasticity with kinematic hardening and dynamic yielding condition, which allows for the dynamic viscosity of the structure. The nonstationary behavior of a rigidly fastened reinforced shell under axisymmetric pulse loading normal to the shell surface is considered as an example. The deflection–time and deflection–space relationships are found 相似文献
7.
The dynamic behavior of a three-layer elliptic cylindrical shell is studied and associated problems are formulated. The refined
Timoshenko model is used. The numerical method used to solve the equations of motion is based on the integro-interpolation
differencing method. The dynamic behavior of a three-layer elliptic cylindrical shell under a distributed nonstationary load
is studied. 相似文献
8.
A refined theory of flexible layered shells with orthotropic layers of variable thickness is considered. The theory assumes that each layer has a local rotation angle due to lateral shear. This makes it possible to derive equations whose order does not depend on the number of layers. The basic equations and calculation results are presented for a three-layer orthotropic toroidal shell under axisymmetric loading 相似文献
9.
An analytical-experimental method for identifying the material constants and functions in the constitutive relations of viscoelastic
strain for homogeneous composite materials is proposed. The method is based on the minimization of the discrepancy between
the results of numerical and experimental modeling of nonstationary deformation processes in shells of revolution made of
the materials under study. The approach was tested and its adequacy was shown in problems of determining the rigidity and
rheological characteristics of composite materials from the results of comparative analytical-experimental study of nonstationary
deformation of spherical and cylindrical shells under impulsive loading. 相似文献
10.
The paper discusses the results of systematic experimental studies of vibrations and dynamic instability of thin shells of
revolution made of laminated composite materials (glassfiber-reinforced plastics). The basic patterns in the dynamic deformation
of shells during natural, forced, and parametric vibrations are considered. The damping parameters of natural vibrations are
analyzed. The wave deformation modes of shells subject to periodic excitation are studied. The effect of long-term vibratory
loading (torsion) on the dynamic characteristics of three-layer glassfiber-reinforced plastic shells is examined 相似文献
11.
《International Journal of Solids and Structures》1999,36(4):597-617
The effect of local geometric imperfections on the buckling and postbuckling of composite laminated cylindrical shells subjected to combined axial compression and uniform temperature loading was investigated. The two cases of compressive postbuckling of initially heated shells and of thermal postbuckling of initially compressed shells are considered. The formulations are based on a boundary layer theory of shell buckling, which includes the effects of the nonlinear prebuckling deformation, the nonlinear large deflection in the postbuckling range and the initial geometric imperfection of the shell. The analysis uses a singular perturbation technique to determine buckling loads and postbuckling equilibrium paths. Numerical examples are presented that relate to the performances of cross-ply laminated cylindrical shells with or without initial local imperfections, from which results for isotropic cylindrical shells follow as a limiting case. Typical results are presented in dimensionless graphical form for different parameters and loading conditions. 相似文献
12.
V. I. Butyrin V. N. Maksimenko L. V. Pavshok B. S. Reznikov 《Journal of Applied Mechanics and Technical Physics》2014,55(1):44-51
The stress-strain state of axisymmetric multilayer shells is analyzed using kinematic and static hypotheses that allow for the transverse shear stresses satisfying the necessary equations of state, continuity conditions at the boundaries between the layers and given boundary conditions. A numerical solution of the problem of the stress-strain state for a multilayer bar is compared with the Lekhnitskii solution (for a cantilever beam loaded by a concentrated force and moment) to asses the applicability of the employed bending equations of multilayer shells. It is shown that these solutions are in good agreement. The problem of the initial fracture of the shells considered is formulated using phenomenological strength criteria for each layer. A coordinate-wise descent method in the unit interval is proposed to solve weight optimization problems for multilayer shells of composite materials under combined loading. Regions of safe operating loads and the optimal weight distribution of layer thicknesses are determined for a multilayer bar acted upon by a uniformly distributed load and concentrated force. 相似文献
13.
P. Z. Lugovoi V. F. Meish B. P. Rybakin G. V. Sekrieru 《International Applied Mechanics》2006,42(4):455-460
The nonstationary behavior of reinforced compound structures is analyzed within the framework of the geometrically nonlinear
Timoshenko theory of shells and rods. The numerical method used to solve the problem is based on the finite-difference approximation
of the original differential equations. The dynamic behavior of a reinforced compound structure under nonstationary loading
is demonstrated by way of a numerical example. The numerical results are compared with experimental data
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Translated from Prikladnaya Mekhanika, Vol. 42, No. 4, pp. 100–107, April 2006. 相似文献
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Experimental studies on dynamic plastic buckling of circular cylindrical shells under axial impact 总被引:1,自引:0,他引:1
In the present paper, experimental studies on dynamic plasticbuckling of circular cylindrical shells under axial impact are
carried out. Hopkinson bar and drop hammer apparatus are used for dynamic loading. Three groups of circular cylindrical shells
made of copper are tested under axial impact. From the experiments, the first critical velocity corresponding to the axi-symmetric
buckling mode and the second critical velocity corresponding to the non-axisymmetric buckling mode are determined. The present
results come close to those of second critical velocity given by Wang Ren[4–6]. Two different kinds of non-axisymmetric buckling modes oval-shaped and triangle shaped are founded. The buckling modes under
two loading cases, viz. with small mass but high velocity and with large mass and low velocity using Hopkinson bar and drop
hammer, are different. Their critical energies are also discussed.
The project is supported by the National Natural Science Foundation of China (19672039) and the Foundation for Returned Scholar
from Abroad of Shanxi Province 相似文献
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18.
V. D. Kubenko P. S. Koval’chuk N. P. Podchasov 《International Applied Mechanics》2011,46(10):1119-1131
The paper outlines a technique to analyze the nonstationary vibrations of cylindrical shells interacting with a fluid flow
and subjected to external periodic pressure with slowly varying frequency. The dynamic processes occurring in the shell–fluid
system as the resonance region is passed forth and back are analyzed 相似文献
19.
P. S. Koval'chuk N. P. Podchasov V. V. Kholopova 《International Applied Mechanics》2003,39(3):312-317
Consideration is given to a nonlinear problem on the nonstationary deformation of cylindrical shells filled with a perfect incompressible liquid and subjected to radial pulse loading distributed along a part of the lateral surface 相似文献