共查询到20条相似文献,搜索用时 46 毫秒
1.
The problem of the time-dependent interaction between two inviscid weightless fluids separated by a semi-infinite non-rigid
plate in a channel with fixed rigid walls is solved in the linear approximation. The general case of deformation and harmonic
oscillations of the plate (flapping mover) are considered. The time-dependent hydrodynamic reaction forces, the position of
the interface, and the dynamic characteristics of the mover are determined.
Kazan’. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 1, pp. 67–76, January–February,
1997. 相似文献
2.
The double-diffusive natural convection past a vertical plate embedded in a fluid-saturated porous medium is considered in
the boundary-layer and Boussinesq approximations. It is assumed that the Soret–Dufour cross-diffusion effects are significant.
The heat and mass fluxes on the plate are prescribed as functions of the surface coordinate x. The general similarity reduction of the problem for power-law and exponential variation of the wall fluxes is given. In
the case of thermosolutal symmetry, when the similar temperature and concentration fields become coincident, exact analytical
as well as numerical solutions are reported and discussed in some detail. For the flows without thermosolutal symmetry, the
final similarity equations have been solved numerically, by paying attention to the influence of the Soret and Dufour numbers
on the departure from thermosolutal symmetry. The reported results focus on the wall temperatures and concentrations, whose
reciprocals are Nusselt and Sherwood numbers, respectively. 相似文献
3.
N. V. Khusnutdinova 《Journal of Applied Mechanics and Technical Physics》2008,49(4):548-552
A problem is considered for the system describing gas flows with plate boundary layer separation in Mises variables in boundary-layer
theory. The existence of generalized solutions of the problem is proved.
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Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 49, No. 4, pp. 36–41, July–August, 2008. 相似文献
4.
The paper addresses a fracture problem for an orthotropic cracked plate made of a material with different tensile and compressive
strengths and subjected to biaxial loading. The problem is solved using a micromechanical fracture model proposed earlier
by the authors. It is assumed that the fracture of the material in the fracture process zones at the crack front is described
by the Gol’denblat–Kopnov failure criterion. Strength curves for an orthotropic cracked plate with different strength and
fracture-toughness parameters are plotted 相似文献
5.
A. M. Lipanov S. A. Karskanov 《Journal of Applied Mechanics and Technical Physics》2008,49(3):354-361
Results of a parametric study of steady asymmetric flows are analyzed. Three-dimensional unsteady equations of hydromechanics
for a compressible medium are solved by a time-dependent method. The range of the characteristic Reynolds number Re = 60–350 is considered. It is shown that a symmetric flow becomes asymmetric at Re = 90. This value can be considered as a threshold value for air. In the examples considered, the upper separation region
is always smaller than the lower separation region owing to flow asymmetry in the vicinity of the left boundary of the domain
of integration. The dependence of the separation region size on the Reynolds number is found.
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Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 49, No. 3, pp. 11–19, May–June, 2008. 相似文献
6.
I. Yu. Tsvelodub 《Journal of Applied Mechanics and Technical Physics》2007,48(5):708-711
An elastic plate with a physically nonlinear inclusion of an arbitrary shape is considered. This plate is subjected to pure
bending under the action of transverse forces and bending moments applied at the external boundary of the plate. There are
no loads distributed over the surface. The problem of finding external actions that provide a necessary uniform moment state
in the inclusion, i.e., prescribed constant moments and curvatures, is formulated and solved.
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Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 48, No. 5, pp. 104–107, September–October, 2007. 相似文献
7.
The problem on the elastoplastic state of a thick isotropic plate (the case of plane deformation) is solved. A larger prismatic
inclusion is made a close fit in a polygonal hole in the plate. The plate is stretched at infinity by constant mutually perpendicular
forces. The problem is solved by the small-parameter method and by the theory of ideal plasticity. The axisymmetric state
of the plane with a circular hole stiffened by a round ring with a constant force applied to its inner contour is considered
as a zero approximation. Some specific shapes of the hole and reinforcing elastic rigid ring are considered.
Voronezh University, Russia. Translated from Prikladnaya Mekhanika, Vol. 36, No. 6, pp. 114–120, June, 2000. 相似文献
8.
I. Yu. Tsvelodub 《Journal of Applied Mechanics and Technical Physics》2006,47(6):899-904
An infinite elastic isotropic plate with an elliptical, physically nonlinear inclusion loaded at infinity by uniformly distributed
moments is considered. Surface loads are absent. The problem of the stress-strain state of the plate is solved in a closed
form. It is shown that, for reasonably general stress-strain relations for the inclusion, the bending-moment field (and the
corresponding curvatures) in the inclusion is homogeneous.
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Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 47, No. 6, pp. 152–157, November–December, 2006. 相似文献
9.
V. Yu. Liapidevskii 《Journal of Applied Mechanics and Technical Physics》2000,41(4):647-657
A mathematical model for the evolution of a mixing layer in shear flows is constructed. The problem of a mixing layer with
pressure gradient is solved: in particular, the distributions of the velocity and basic characteristics of turbulent flow
in the mixing layer are obtained.
Lavrent'ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated from
Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 41, No. 4, pp. 81–92, July–August, 2000. 相似文献
10.
D. A. Khodzhaev B. Kh. Éshmatov 《Journal of Applied Mechanics and Technical Physics》2007,48(6):905-914
The problem of vibrations of a viscoelastic plate with concentrated masses is studied in a geometrically nonlinear formulation.
In the equation of motion of the plate, the action of the concentrated masses is taken into account using Dirac δ-functions.
The problem is reduced to solving a system of Volterra type ordinary nonlinear integrodifferential equations using the Bubnov-Galerkin
method. The resulting system with a singular Koltunov-Rzhanitsyn kernel is solved using a numerical method based on quadrature
formulas. The effect of the viscoelastic properties of the plate material and the location and amount of concentrated masses
on the vibration amplitude and frequency characteristics is studied. A comparison is made of numerical calculation results
obtained using various theories.
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Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 48, No. 6, pp. 158–169, November–December, 2007. 相似文献
11.
F. A. Bakhyshov V. M. Mirsalimov 《Journal of Applied Mechanics and Technical Physics》2006,47(4):588-595
Based on the balanced strength principle, a problem of determining the optimal interference for fitting elastic inclusions
into holes of an isotropic elastic plate weakened by a doubly periodic system of circular holes is solved. A closed system
of algebraic equations is derived, which allows solving this problem. The resultant interference increases the load-carrying
capacity of the composite plate being bent.
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Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 47, No. 4, pp. 153–161, July–August, 2006. 相似文献
12.
An approximate method for the efficient calculation of stagnation-streamline quantities in hypersonic flows about spheres
or cylinders is suggested. Based on the local similarity of the flow field the two-dimensional Navier-Stokes equations are
simplified to a one-dimensional approximation for the stagnation streamline. These equations are solved with an implicit finite-volume
scheme. Comparisons with fully two–dimensional Euler and Navier–Stokes calculations for flows about spheres are presented,
that include perfect gas flows and flows in chemical non-equilibrium. Comparisons with a number of experiments conclude this
report.
Received 8 May 1996 / Accepted 31 October 1996 相似文献
13.
V. N. Maksimenko G. V. Nedogibchenko 《Journal of Applied Mechanics and Technical Physics》2000,41(3):569-575
A mixed problem of linear elasticity for an infinite anisotropic plate with cuts and thin undeformable inclusions located
along arbitrary open smooth curves is solved with the use of complex potentials. Special representations of the solutions
are constructed and a governing system of singular integral equations is obtained. A numerical algorithm for determining the
stress-strain state of the plate, including the stress-intensity factors at the tips of cuts and rigid inclusions, is proposed.
Calculation results are given.
Novosibirsk State Technical University, Novosibirsk 630092. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika,
Vol. 41, No. 3, pp. 213–219, May–June, 2000. 相似文献
14.
A. A. Korobkin 《Journal of Applied Mechanics and Technical Physics》2000,41(2):286-292
The problem of the behavior of a floating elastic plate in waves is solved numerically. The normal mode method is used. For
a fluid of finite depth, the hydrodynamic coefficients are obtained in explicit form. Numerical results are compared with
experimental data for the stress distribution in the plate and also with numerical results of other authors. The results are
in good agreement for not very short waves. For incident waves whose wavelength is comparable with the length of the plate,
a long-wave approximation of the solution is proposed. Within the framework of this approximation, the solution is given in
analytical form.
Lavrent'ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated from
Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 41, No. 2, pp. 90–96, March–April, 2000. 相似文献
15.
V. N. Solodovnikov 《Journal of Applied Mechanics and Technical Physics》1999,40(5):969-978
Contact problems with friction are solved for a rectangular plate with a circular hole into which a ring plate (insert) is
placed with a small clearance. Two versions of contact boundary conditions are formulated. According to the proposed approximate
formulation of the problem, the boundary conditions in both versions are satisfied not at the actual contact points but at
specified pairs of points. Therefore, it is sufficient to determine attachment, slip, contact, and contact-free regions on
just one of the contacting contours. The finite-element method and the Boussinesq principle are used to solve the problem.
One of the versions of boundary conditions, compared to the other, gives smaller values for the strain energies of the plate
and insert, the stress-concentration coefficient, and the lengths of attachment and contact regions.
Lavrent’ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated from
Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 40, No. 5, pp. 216–226, September–October, 1999. 相似文献
16.
B. Kh. Eshmatov 《Journal of Applied Mechanics and Technical Physics》2006,47(2):289-297
The dynamic stability problem of viscoelastic orthotropic and isotropic plates is considered in a geometrically nonlinear
formulation using the generalized Timoshenko theory. The problem is solved by the Bubnov-Galerkin procedure combined with
a numerical method based on quadrature formulas. The effect of viscoelastic and inhomogeneous properties of the material on
the dynamic stability of a plate is discussed.
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Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 47, No. 2, pp. 165–175, March–April, 2006. 相似文献
17.
The mixed convection in a vertical plane-parallel channel with two heat sources of finite dimensions located at the wall is
analyzed on the basis of a two-dimensional numerical simulation. The effect of the distance between the heat sources on the
flow pattern and the temperature field is studied. Calculations are performed on the Grashof and Reynolds number ranges from
0–105 and 0–10, respectively, at a Prandtl number of 0.7. The mathematical model is based on the time-dependent Navier-Stokes equations
in the Boussinesq approximation. The problem is solved by the finite element method. 相似文献
18.
V. I. Odinokov A. M. Sergeeva 《Journal of Applied Mechanics and Technical Physics》2006,47(2):266-273
The spatial problem of determining the stress-strain state of an ice plate of finite thickness broken by a patented method
is solved using the theory of small elastoplastic strains and a proven numerical method.
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Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 47, No. 2, pp. 139–146, March–April, 2006. 相似文献
19.
The thermoelastic problem for an infinite multiply connected anisotropic plate with holes and cracks in a linear heat flow
is solved. The stress distribution and the stress intensity factors on heat-insulated boundaries are analyzed numerically
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Translated from Prikladnaya Mekhanika, Vol. 41, No. 9, pp. 127–136, September 2005. 相似文献
20.
I. Yu. Khoma 《International Applied Mechanics》2006,42(11):1285-1297
The three-dimensional stress state of a transversely isotropic plate with a nearly circular cylindrical cavity is examined.
The cavity surface is subject to normal and tangential stresses and the plate is subject at infinity to tensile and shear
forces. The problem is solved by expanding unknown functions into Fourier-Legendre series in the thickness coordinate and
using the boundary-shape perturbation method. The equations and recurrence formulas needed to solve the problem in an arbitrary
approximation are presented
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Translated from Prikladnaya Mekhanika, Vol. 42, No. 11, pp. 101–113, November 2006. 相似文献