International Journal of Applied Mechanics and Engineering
In this paper, we point out local similarity transformations for the flow through a medium with high porosity bounded by a semi-infinite horizontal plate when the free stream velocity is of exponential form.
The paper deals with three collinear Griffith cracks propagating with constant velocity under antiplane shear stress at the interface of an elastic layer of finite thickness h and a semi-infinite half plane of different elastic properties. The Fourier transform technique is used to reduce the elastodynamic problem to the solution of a set of integral equations which has been solved by using the finite...
The role of spreading during SHS surfacing of the protective coatings has been investigated theoreticaly and experimentally. The case, when spreading of large drops is forced by the effect of gravity and the interface forces are low, is considered. Analytical and numeric solutions of the problem have shown that the ratio of the specific times of cooling and spreading is the main parameter, which determines...
This paper presents a residual stress analysis and plastic zone behavior in antisymmetric aluminum metal-matrix laminated plates. First-order shear deformation theory and Finite Element Method are considered in the solution for small deformations. The plate is meshed into 64 elements and 289 nodes with both simply supported or clamped boundary conditions. Stainless steel fiber reinforced aluminum...
The conventional design of building frames is based on the assumption that the settlement of footings has no effect on the load of the corresponding columns. In reality, the differential settlements among various footings result in a redistribution of the column loads, the amount of which depends on the rigidity of the structure and the load-settlement characteristics of the soil. The present paper...
The dynamic rupture process of a thin liquid film on a cylinder has been analyzed by investigating the stability under the influence of a non-uniform electrostatic field to finite amplitude disturbances. The dynamics of the liquid film is formulated using the balance equations including a body force term due to van der Waals attractions. The effect of the electric field is included in the analysis...
The present study is devoted to investigating the influences of magnetic field on buoyancy induced flow over vertical flat plate embedded in a non-Newtonian fluid saturated porous medium. The Ostwald-de Waele power-law model is used to characterize the non-Newtonian fluid behavior. A similarity solution for the transformed governing equations is obtained with a prescribed variable surface heat flux...
In this paper, the basic processes accompanying a shock initiation of a detonation have been analyzed theoretically using numerical methods. The detailed discussion of initiation of a detonation by nonstationary shock waves generated by a solid body impact or explosively driven inertial partition is presented. The physical-mathematical model applied here comprises the set of equations of gas-dynamics,...
A 2-dimensional computational fluid dynamics analysis of steady state thermal boundary layer flow of a second order non-Newtonian fluid past a horizontal wedge in a Brinkman-Darcy porous medium, in the presence of a transverse magnetic field, is presented. The governing equations are transformed from Cartesian coordinates (x,y) into a sixth order system of partial differential equations in a 'ksi'-n...
This paper analyses the stability characteristics of oil journal bearings considering the effect of elastic distortion on the surface of bearing liner and variation of viscosity of oil due to pressure. The theoretical analysis is intended to show how the effects of elastic distortion on the journal bearing performance can be calculated for three-dimensional bearing geometries. The deformation equations...
A free convection flow of a second order liquid past an impulsively started vertical plate in the presence of a transverse magnetic field has been studied in this paper. The solution has been obtained by finite-difference method. The effect of the parameters m (magnetic field strength), Pr (Prandtl number), Gr (Grashof number, Gr>0, cooling of the plate by free convection, Gr<0, heating of the...
The stability of a horizontal fluid layer bounded on either side by porous layers with different permeabilities is examined for different non-uniform basic temperature gradients using general velocity and thermal conditions at the boundaries. In the case of sudden heating and cooling, analytical solutions are obtained using single-term Galerkin expansion. Numerical solutions are obtained for all possible...
A fourth order nonlinear evolution equation, which is a good starting point for the study of nonlinear water waves of wave-steepness up to 0.25, is used here to investigate the effect of randomness on stability of deep-water surface gravity waves in the presence of wind blowing over water. A spectral transport equation for narrow band Gaussian surface wave is derived. With the use of this transport...
The design of thin structures must take into account the overall instability and the instability of component plates in the form of local buckling. The present paper deals with a non-linear analysis of stability and load carrying capacity for a sheet-metal section with trapezoidal repeating elements when the distortional deformations are taken into account. The plates are assumed to be simply supported...
A layer of electrically conducting couple-stress fluid heated from below in porous medium is considered in the presence of uniform horizontal magnetic field. The medium permeability hastens the onset of convection whereas the magnetic field and couple-stress postpone the onset of convection, for the case of stationary convection. The oscillatory modes are introduced by the magnetic field which were...
The thermal convection of a second grade fluid in a concentric pipe flow is studied in this paper. The motion of the fluid and its state of stress are not influenced by the variation of temperature. In steady flows, both the velocity and the fluid temperature distribution are identical to those resulting from the Navier-Stokes theory.
Beam is a structural element loaded transversely in general conditions. This loading causes shear forces and bending moments. In this study, an elasto-plastic stress analysis is carried out in a low density polyethylene thermoplastic composite beam reinforced by woven steel fibers subjected to a uniformly distributed load in transverse direction. In the elasto-plastic solution, the material is assumed...
This paper investigates analytically heat sinks effect on transient free convective flow in a vertical channel. Laplace transform technique has been used to solve the governing momentum and energy equations. The expressions for velocity field, temperature field, skin-friction and rate of heat transfer have been obtained in closed form for two different cases. The influence of heat sinks and time parameter...
In this study we develop a fundamental understanding of an aerodynamic method of forming fibrous web structures from short fibres. Computational fluid dynamics is employed to model the air flow in the system and based on this analysis the fibre dynamics in the process are then modelled. Experimental results were obtained by using high speed photography and we have found reasonable agreement between...
The paper presents a new technique for measuring the time constant of the bridgeless CTA in which the overheating ratio is set digitally. The results of studies of anemometer dynamic behaviour are discussed. The overheating ratio is modulated sinusoidally with respect to its mean value. The tests were run in steady- flow conditions. Hot wire sensors are made of tungsten wire 8 micrometers in diameter,...