The article is devoted to the stability of the polymer rods variable stiffness with the initial imperfec-tions and the development of creep deformation. The distinctive feature of the paper is a variable stiffness of the cross section and the use of fixing all, "seal-hinge" "seal, seal", "seal-free edge."
Keywords: stability of rods, creep, highly elastic deformation, polymeric materials, coupling equation of Maxwell-Gurevich
Information about authors of issue №2 (2013)
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This article is related to technological problems of cavities with kamufletnyh explosions, during which the temperature in the cavity greatly exceeds the initial temperature of the array. Often these cavities are created in an array of rock salt. Because the salt even at light loads demonstrate expressive flow properties, it is interesting solution to the problem of creep salt massif with a cavity under the action of a force (pressure inside the cavity and the pressure of the soil), and thermal loads.
Keywords: heterogeneity, creep, highly elastic deformation, hydrochloric array coupling equation, the integral relations
This article related to the technological problem. Books and manuscripts are subjected to natural aging due to the fragility of the raw materials, the deterioration of the conditions of storage, as well as losses of fragments due to repeated or careless operation. Therefore, for libraries, archives and museums is particularly important in matters of preservation of documents not only the process of conservation, but the recovery of the lost fragments.
Keywords: technology, restoration, conservation, listodolivochnye machines, vacuum table, the machine for making pulp
The problem of a radial compressive stress in the sample to assess their impact on the parameters of these stresses pressing indentors
Keywords: Diagnostics, resource efficiency, mechanical properties, strength, ductility, hardness, toughness, nondestructive testing, destructive
We consider the problem of pressing a conical indenter in pre-compressed radial force elastoplastic medium. The influence of the initial stresses on the parameters of the indentation.
Keywords: Diagnostics, resource efficiency, mechanical properties, strength, ductility, hardness, toughness, nondestructive testing, destructive
The article shows that the viscoelastic behavior of polymers is well described by a nonlinear generalized Maxwell equation, generalized Russian scientists GI Gurevich In this paper, based on the results of experimental studies of the isothermal relaxation of thermal stresses presented a method to determine the relaxation parameters of the equation. The experiment was carried out on thin-walled tubes, with rigidly clamped ends. Heating or cooling from initial temperature to a final temperature (the temperature relaxation time) was carried out at a constant rate of heating (cooling) in a linear fashion. This work shows that the linearized theory does not give correct results.
Keywords: Thermal stresses, the Maxwell equations relating the parameters, isothermal relaxation
Solving the problem is a strong dependence of physical and mechanical properties of the polymer and the relaxation of the temperature. Significantly affect the time within which the rod is able to maintain a stable position.
For example, the rod loaded with only 57% of the Euler force, loses stability at a temperature of 40°C is about 15 times faster than at 20°C. Thus, to fully exploit the potential of polymeric material to protect it from the effects of temperature.
Keywords: thermal loading, stability, algorithm, approximation
Given the task of calculating the stresses in the radiation-thermal plant screen. This design, also known as «dry protection» is intended to reduce the effects of radiation and heat, generated in the reactor. A significant redistribution of stresses due to changes in elastic modulus due to the above effects.
Keywords: thermal loading, loading of radiation, the calculation of protection for accident-mode for trouble
Information about authors of issue №4 p.2 (2012)
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Information about authors of issue №3 (2012)
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Energy method in the form of Tymoshenko Ritz-solved the problem of stability of a circular cylindrical shell under uniform axial compression. Considered axisymmetric shape shell buckling during buckling and axisymmetric initial state, as well as axisymmetric subcritical state during compression. The resulting solution is exactly consistent with the decision of the Lorentz-Tymoshenko known as a classic.
Keywords: Skin, sustainability, energy, work, buckling.
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The article investigates the stability of the polymer rods epoxy resin EDT-10 taking into account the initial imperfections and development of creep deformation. A distinctive feature is the initial article was killed in a S-shaped curve.
Keywords: stability rods, creep, highly elastic deformation, polymeric materials, coupling equation Maxwell-Gurevich.
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Information about authors of issue №4 (2011)
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