The dynamic problem of thermo-elastic-viscous-plastic deformation shallow composite shells is formulated using the refined theory bending. In this case, tangential displacements along thickness constructions are approximated by polynomials third and higher orders, deflection does not depend on transverse coordinate. Normal stresses in composition have a linear distribution over thickness. tempe...

Three-dimensional collapse of and steady flow through finite-length elastic tubes are studied numerically. The Navier-Stokes equations coupled with large, nonlinear deformation of the elastic wall are solved by using the finiteelement software, FIDAP. Three-dimensional solid elements are used for the elastic wall, allowing us to specify any wall thickness required. Plane-strain results for the ...

In this work we consider a semilinear initial boundary-value problem modelling an elastic thin plate (in the context of the so-called KirchhoffLove theory) coupled with an elastic membrane, regarding homogeneous boundary conditions. By means of the theory of strongly continuous semigroups of linear operators applied to abstract semilinear initial valued problems [16], we obtain existence and un...

Thin-walled shell-type structures are widely used in various branches of technology and industry. Such under operating conditions usually exposed to loads, including thermomechanical ones. Real shell structures, as a rule, have complex shapes. To increase reliability, reduce material consumption, for technological reasons, they designed inhomogeneous systems thickness. This causes great constan...

The dynamical process following the breaking of Weyl geometry to Rieman-nian geometry is considered by studying the motion of de Sitter bubbles in a Weyl vacuum. The bubbles are given in terms of an exact, spherically symmetric thin shell solution to the Einstein equations in a Weyl-Dirac theory with a time-dependent scalar field of the form β = f (t)/r. The dynamical solutions obtained lead to...

We study the dynamics of false vacuum bubbles in the Brans-Dicke theory of gravity by using the thin shell or thin wall approximation. We consider a false vacuum bubble that has a different value for the Brans-Dicke field between the inside false vacuum region and the outside true vacuum region. Within a certain limit of field values, the difference of field values makes the effective tension o...

This research deals with axial and oblique impact crash tests on simple and hybrid composite tubes. Axial and oblique impact tests have been generated on simple and hybrid composite tubes with one, two and three layers. A drop test rig was used to conduct the experiments. Furthermore, in order to gain more detailed knowledge about the crash process, finite element simulations of the experim...

This paper describes a method for evaluating material properties of multi-layered system and functional gradient materials from data obtained from indentation testing. The measurement data collected from the penetration force-depth curves is employed for identifying elastic moduli of thin films and functional gradient materials. An axisymmetric indentation problem is first analyzed on the basis...

Thin soft elastic layers serving as joints between relatively rigid bodies may function as sealants, thermal, electrical, or mechanical insulators, bearings, or adhesives. When such a joint is stressed, even though perfect adhesion is maintained, the exposed free meniscus in the thin elastic layer becomes unstable, leading to the formation of spatially periodic digits of air that invade the ela...

The article touches upon the problem of natural oscillations a thin elastic wavy shell an open profile. proposed method for determining numerical values lowest frequencies and corresponding forms shells complicated shape is based on Rayleigh-Ritz energy method.
 results calculation this with hinge-fixed attachment along lower contour generatrix are presented.