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1.
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Three design techniques for stability analysis of longitudinally corrugated cylindrical shells are examined. The first two account for the true geometry of the shell and the third one replaces the corrugated shell with an equivalent orthotropic shell using reduction formulas. The exact formulations employ classical and Timoshenko-type theories. The techniques are analyzed by an example of sinusoidally corrugated shells. It is shown that the exact formulation permits finding practically important relations for corrugation parameters, which raises considerably the specific critical loads. 相似文献
3.
4.
V. P. Zhelezny Yu. V. Semenyuk S. N. Ancherbak N. V. Emel’yanenko 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2009,83(2):182-186
The results obtained in studying the temperature dependence of parachor are presented. The concepts of the parachor at the critical point and reduced parachor are introduced. The approach based on scaling principles and the assumption of a universal character of changes in crossover functions at critical exponents was used to obtain a universal temperature dependence of the reduced parachor. The dependence of the parachor at the critical point on the critical molar volume was established. The constituents of parachor were determined for halogenated hydrocarbons. 相似文献
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Cylindrical shells consisting of cylindrical panels of smaller radius and subjected to uniform external pressure are analyzed
for stability. The geometrical parameters of the shells are approximated by Fourier series on a discrete set of points. The
Timoshenko theory of shells is used. The solution is represented in the form of trigonometric series. It is shown that short-and
medium-length shells with cylindrical panels are advantageous over circular shells. By selecting appropriate parameters of
the panels, keeping the mass of the shell constant, it is possible to achieve a significant gain in critical loads. The shells
under consideration are less effective than isotropic shells. Shells with sinusoidal corrugation under external pressure are
of no practical interest
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Translated from Prikladnaya Mekhanika, Vol. 43, No. 12, pp. 91–102, December 2007. 相似文献
7.
The paper outlines a procedure to derive the canonical system of equations of the classical theory of thin shells using Reissner’s
variational principle and partial variational principles. The Hamiltonian form of the Reissner functional is obtained using
Lagrange multipliers to include the kinematical conditions that follow from the Kirchhoff-Love hypotheses. It is shown that
the canonical system of equations can be represented in three different forms: one conventional form (five equilibrium equations)
and two forms that are equivalent to it. This can be proved by reducing them to the same system of three equations. For problems
with separable active and passive variables, partial variational principles are formulated
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Translated from Prikladnaya Mekhanika, Vol. 43, No. 10, pp. 99–107, October 2007. 相似文献
8.
The buckling problem for longitudinally corrugated cylindrical shells under external pressure is solved. The solution makes
practically exact allowance for the geometry and buckling modes of the shell. The inaccuracy of the results is due to the
assumption that the subcritical state is momentless. Shells consisting of cylindrical panels of smaller radius and noncircular
shells with sinusoidal corrugations are analyzed for stability. The practical applicability of such shells is demonstrated
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Translated from Prikladnaya Mekhanika, Vol. 43, No. 11, pp. 66–79, October 2007. 相似文献
9.
An approach to determining the effective characteristics of nanocomposites with well-known methods of micromechanics is proposed.
The irregular distribution of discrete bonds between a nanofiber and the polymeric matrix over the fiber circumference is
taken into account. The area with a great number of bonds is modeled by a continuum and the area with a small number of bonds
is modeled by a discontinuity. The dependence of the mechanical characteristics of nanocomposites on the volume fraction of
the reinforcement and the size of the imperfect-bonding zone is studied. The performance of such materials in structures is
demonstrated by stability design of cylindrical shells 相似文献
10.